IPAC2014 - List of Keywords (collider)

Paper	Title	Other Keywords	Page
MOXAA01	Challenges for Highest Energy Circular Colliders	luminosity, radiation, hadron, synchrotron	1
	F. Zimmermann, M. Benedikt, D. Schulte, J. Wenninger CERN, Geneva, Switzerland
	A new tunnel of 80-100 km circumference could host a 100 TeV centre-of-mass energy-frontier proton collider (FCC-hh/VHE-LHC), with a circular lepton collider (FCC-ee/TLEP) as potential intermediate step, and a lepton-hadron collider (FCC-he) as additional option. FCC-ee, operating at four different energies for precision physics of the Z, W, and Higgs boson and the top quark, represents a significant push in terms of technology and design parameters. Pertinent R&D efforts include the RF system, top-up injection scheme, optics design for arcs and final focus, effects of beamstrahlung, beam polarization, energy calibration, and power consumption. FCC-hh faces other challenges, such as high-field magnet design, machine protection and effective handling of large synchrotron radiation power in a superconducting machine. All these issues are being addressed by a global FCC collaboration. A parallel design study in China prepares for a similar, but smaller collider, called CepC/SppC.
	Slides MOXAA01 [27.493 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOXAA01
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPRO004	Polarized Ion Beams in Figure-8 Rings of JLab's MEIC	polarization, solenoid, controls, ion	68
	Y. Filatov MIPT, Dolgoprudniy, Moscow Region, Russia Y.S. Derbenev, F. Lin, V.S. Morozov, Y. Zhang JLab, Newport News, Virginia, USA Y. Filatov JINR, Dubna, Russia A.M. Kondratenko, M.A. Kondratenko Science and Technique Laboratory Zaryad, Novosibirsk, Russia
	Funding: Authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177 and DE-AC02-06CH11357. The Medium-energy Electron-Ion Collider (MEIC) proposed by Jefferson Lab is designed to provide high polarization of both colliding beams. One of the unique features of JLab’s MEIC is figure-8 shape of its rings. It allows preservation and control of polarization of all ion species including small-anomalous-magnetic-moment deuterons during their acceleration and storage. The figure-8 design conceptually expands the capability of obtaining polarized high-energy beams in comparison to conventional designs because of its property of having no preferred periodic spin direction. This allows one to control effectively the beam polarization by means of magnetic insertions with small field integrals. We present a complete scheme for preserving the ion polarization during all stages of acceleration and its control in the collider’s experimental straights.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPRO004
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPRO005	Progress on the Interaction Region Design and Detector Integration at JLab’s MEIC	detector, electron, ion, focusing	71
	V.S. Morozov, P.D. Brindza, A. Camsonne, Y.S. Derbenev, R. Ent, D. Gaskell, F. Lin, P. Nadel-Turonski, M. Ungaro, Y. Zhang, Z.W. Zhao JLab, Newport News, Virginia, USA C. Hyde, K. Park Old Dominion University, Norfolk, Virginia, USA M.K. Sullivan SLAC, Menlo Park, California, USA Z.W. Zhao UVa, Charlottesville, Virginia, USA
	Funding: Authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177 and DE-AC02-06CH11357. One of the unique features of JLab's Medium-energy Electron-Ion Collider (MEIC) is a full-acceptance detector with a dedicated, small-angle, high-resolution detection system, capable of covering a wide range of momenta (and charge-to-mass ratios) with respect to the original ion beam to enable access to new physics. We present an interaction region design developed with close integration of the detection and beam dynamical aspects. The dynamical aspect of the design rests on a symmetry-based concept for compensation of non-linear effects. The optics and geometry have been optimized to accommodate the detection requirements and to ensure the interaction region's modularity for ease of integration into the collider ring lattices. As a result, the design offers an excellent detector performance combined with the necessary provisions for non-linear dynamical optimization.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPRO005
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPRO006	Preservation of Electron Polarization in the MEIC Collider Ring	polarization, electron, injection, solenoid	74
	F. Lin, Y.S. Derbenev, V.S. Morozov, Y. Zhang JLab, Newport News, Virginia, USA D.P. Barber DESY, Hamburg, Germany
	Funding: U.S. DOE Contract No. DE-AC05-06OR23177 and DE-AC02-06CH11357. A highly longitudinally-polarized (over 70%) electron beam is required by the nuclear physics programme of the Medium Energy Electron-Ion Collider (MEIC) at Jefferson Lab (JLab). To achieve this goal, a highly vertically-polarized electron beam is injected from the CEBAF. The polarization will be vertical in the arcs to avoid spin diffusion, and longitudinal at the collision points. The polarization rotation will be accomplished by using a total of four spin rotators, each of which consists of a set of solenoids and dipoles, placed at the ends of two arcs. The polarization configuration cancels the 1st order spin perturbation in the solenoids for the off-momentum particles and significantly reduces the synchrotron sideband resonances. In order to compensate the net Sokolov-Ternov depolarization effect, especially at higher energies, a continuous injection of a polarized electron beam from the CEBAF is being considered. We consider to perform a moderate spin matching in some key regions to extend the polarization lifetime so that the continuous injection can work more efficiently, while not imposing a burden on the optics design of the collider ring.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPRO006
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPRO007	GPU-Accelerated Long-Term Simulations of Beam-Beam Effects in Colliders	GPU, luminosity, simulation, electron	77
	B. Terzić, F. Lin, V.S. Morozov, Y. Roblin, H. Zhang JLab, Newport News, Virginia, USA M. Aturban, D. Ranjan, M. Zubair ODU CS, Norfolk, Virginia, USA
	Funding: Authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177. We present an update on the development of the new code for long-term simulation of beam-beam effects in particle colliders. The underlying physical model relies on a matrix-based arbitrary-order particle tracking (including a symplectic option) for beam transport and the generalized Bassetti-Erskine approximation for beam-beam interaction. The computations are accelerated through a parallel implementation on a hybrid GPU/CPU platform. With the new code, previously computationally prohibitive long-term simulations become tractable. The new code will be used to model the proposed Medium-energy Electron-Ion Collider (MEIC) at Jefferson Lab.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPRO007
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPRO045	Beam Delivery Simulation: BDSIM - Development & Optimisation	simulation, lattice, background, detector	182
	L.J. Nevay, S.T. Boogert, H. Garcia, S.M. Gibson, R. Kwee-Hinzmann, J. Snuverink JAI, Egham, Surrey, United Kingdom L.C. Deacon UCL, London, United Kingdom
	Funding: Research supported by FP7 HiLumi LHC - grant agreement 284404. Beam Delivery Simulation (BDSIM) is a Geant4 and C++ based particle tracking code that seamlessly tracks particles through accelerators and detectors, including the full range of particle interaction physics processes from Geant4. BDSIM has been successfully used to model beam loss and background conditions for many current and future linear accelerators such as the Accelerator Test Facility 2 (ATF2) and the International Linear Collider (ILC). Current developments extend its application for use with storage rings, in particular for the Large Hadron Collider (LHC) and the High Luminosity upgrade project (HL-LHC). This paper presents the latest results from using BDSIM to model the LHC as well as the developments underway to improve performance.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPRO045
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPME027	Parallel Three-dimensional PIC Code for Beam-beam Simulation in Linear Colliders	simulation, linear-collider, beam-beam-effects, positron	439
	M.A. Boronina, V.D. Korneev, V.A. Vshivkov ICM&MG SB RAS, Novosibirsk, Russia
	We present our parallel 3D3V particle-in-cell code for the numerical simulations of ultrarelativistic charged beams in supercolliders. In the algorithm we employ the three-dimensional set of Maxwell equations and the Vlasov-Liouville equation for the distribution function of beam particles in 6-dimensional phase space. The code allows performing numerical experiments with an arbitrary density distribution, beam crossing angle and relative offset. From the mathematical point of view the main problem of the three-dimensional modeling is the presence of the high relativistic factor values (the field gradients are high), the convergence conditions for PIC method and the necessary number of particles in 3D cell. Thus the parallel algorithm is based on the mixed Euler-Lagrangian decomposition in order to achieve good load balancing, and demonstrates the high scalability. With the advances of the code it will be possible to apply it for one-passage beam-beam simulations in linear colliders with supercritical parameters. We present the results of numerical simulations of colliding beams using dummy parameters and parameters close to the ones of the newest ILC project.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPME027
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPME033	Beam Dynamics in an Electron Lens with the Warp Particle-in-cell Code	electron, simulation, gun, solenoid	451
	G. Stancari Fermilab, Batavia, Illinois, USA V. Moens EPFL, Lausanne, Switzerland S. Redaelli CERN, Geneva, Switzerland
	Funding: Fermi Research Alliance, LLC operates Fermilab under Contract DE-AC02-07CH11359 with the US Department of Energy. Research supported in part by US LARP and EU FP7 HiLumi LHC, Grant Agreement 284404. Electron lenses are a mature technique for beam manipulation in colliders and storage rings. In an electron lens, a pulsed, magnetically confined electron beam with a given current-density profile interacts with the circulating beam to obtain the desired effect. Electron lenses were used in the Fermilab Tevatron collider for beam-beam compensation, for abort-gap clearing, and for halo scraping. They will be used in RHIC at BNL for head-on beam-beam compensation, and their application to the Large Hadron Collider for halo control is under development. At Fermilab, electron lenses will be implemented as lattice elements for nonlinear integrable optics. The design of electron lenses requires tools to calculate the kicks and wakefields experienced by the circulating beam. We use the Warp particle-in-cell code to study generation, transport, and evolution of the electron beam. For the first time, a fully 3-dimensional code is used for this purpose.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPME033
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPME038	Space Charge Simulation in COSY using The Fast Multipole Method	space-charge, emittance, multipole, simulation	460
	B.T. Loseth, M. Berz, K. Makino MSU, East Lansing, Michigan, USA P. Snopok Fermilab, Batavia, Illinois, USA H. Zhang JLab, Newport News, Virginia, USA
	A method is implemented in COSY Infinity that allows the computation of space charge effects of arbitrary and large distributions of particles in an efficient and accurate way based on a variant of the Fast Multipole Method (FMM). It relies on an automatic multigrid-based decomposition of charges in near and far regions and the use of high-order differential algebra methods to obtain decompositions of far fields that lead to an error that scales with a high power of the order. Given an ensemble of N particles, the method allows the computation of the self-fields of all particles on each other with a computational expense that scales as O(N). Furthermore, the method allows the computation of all high-order multipoles of the space charge fields that are necessary for the computation of high-order transfer maps and all resulting aberrations. Space charge effects are crucial in modeling the latter stages of the six-dimensional (6D) cooling channel for the Muon Collider. Results of simulating the 6D cooling channel for the Muon Collider using the FMM method and other tools and improvements implemented for ionization cooling lattices are presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPME038
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPME047	Comparison of the Results of a Hydrodynamic Tunneling Experiment with Iterative FLUKA and BIG2 Simulations	target, simulation, proton, experiment	479
	F. Burkart, J. Blanco, D. Grenier, R. Schmidt, D. Wollmann CERN, Geneva, Switzerland N.A. Tahir GSI, Darmstadt, Germany
	In 2012, a novel experiment has been performed at the CERN HiRadMat facility to study the impact of a 440 GeV proton beam generated by the Super Proton Synchrotron (SPS), on extended solid copper cylindrical targets. Substantial hydrodynamic tunneling of the protons in the target material has been observed. Iterative FLUKA and BIG2 simulations with the parameters of the actual experiment have been performed. In this paper the results of these simulations will be discussed and compared to the experimental measurements. Furthermore, the implication on the machine protection design for high intensity hadron accelerators as the current LHC and the future High Luminosity LHC will be addressed.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPME047
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPME048	CLIC Decelerator - Machine Protection	emittance, quadrupole, alignment, operation	482
	L.M. Hein, J. Esberg, M. Jonker CERN, Geneva, Switzerland
	The Compact Linear Collider CLIC is based on a four beam scheme, two colliding beams (main beams) and two drive beams, which are used to accelerate the main beams. The intended drive beam parameters exceed the "safe beam" threshold by a factor of 100. Hence, in case of a beam impact serious structural damages of the accelerator equipment are expected. In order to avoid structural damages caused by the drive beam detailed studies of its beam dynamics are on-going. In this paper the major characteristics of the drive-beam beam-dynamics and preliminary machine protection results are summarised.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPME048
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUOBA01	Electron Lenses for the Large Hadron Collider	electron, collimation, controls, operation	918
	G. Stancari, A. Valishev Fermilab, Batavia, Illinois, USA R. Bruce, S. Redaelli, A. Rossi, B. Salvachua CERN, Geneva, Switzerland
	Funding: Fermi Research Alliance, LLC operates Fermilab under Contract DE-AC02-07CH11359 with the US Department of Energy. Research supported in part by US LARP and EU FP7 HiLumi LHC, Grant Agreement 284404. Electron lenses are pulsed, magnetically confined electron beams whose current-density profile is shaped to obtain the desired effect on the circulating beam. Electron lenses were used in the Fermilab Tevatron collider for bunch-by-bunch compensation of long-range beam-beam tune shifts, for removal of uncaptured particles in the abort gap, for preliminary experiments on head-on beam-beam compensation, and for the demonstration of halo scraping with hollow electron beams. Electron lenses for beam-beam compensation are being commissioned in RHIC at BNL. Within the US LHC Accelerator Research Program and the European HiLumi LHC Design Study, hollow electron beam collimation was studied as an option to complement the collimation system for the LHC upgrades. This project is moving towards a technical design in 2014, with the goal to build the devices in 2015-2017, after resuming LHC operations and re-assessing needs and requirements at 6.5 TeV. Because of their electric charge and the absence of materials close to the proton beam, electron lenses may also provide an alternative to wires for long-range beam-beam compensation in LHC luminosity upgrade scenarios with small crossing angles.
	Slides TUOBA01 [9.709 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUOBA01
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUOBA03	Recent Beam-beam Effects and Luminosity at VEPP-2000	luminosity, positron, electron, detector	924
	D.B. Shwartz, D.E. Berkaev, A.S. Kasaev, I. Koop, A.N. Kyrpotin, A.P. Lysenko, E. Perevedentsev, V.P. Prosvetov, Yu. A. Rogovsky, A.L. Romanov, A.I. Senchenko, P.Yu. Shatunov, Y.M. Shatunov, I.M. Zemlyansky, Yu.M. Zharinov BINP SB RAS, Novosibirsk, Russia
	Funding: Work is supported by the Ministry of Education and Science of the Russian Federation, grant N 14.518.11.7003 VEPP-2000's last season was dedicated to the energy range of 160-520 MeV per beam. The application of round colliding beams concept along with the accurate orbit and lattice correction yielded the high peak luminosity of 1.210³¹ cm^-2s⁻¹ at 500 MeV with average luminosity of 0.910³¹ cm^-2s⁻¹ per run. The total beam-beam tune shift up to 0.174 was achieved in the runs at 392.5 MeV. This corresponds to beam-beam parameter ksi = 0.125 per one interaction point. The injection system is currently being upgraded to allow for the injection at the top energy of VEPP-2000 collider and to eliminate the present lack of positrons.
	Slides TUOBA03 [4.475 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUOBA03
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUOCB01	Concept of a Hybrid (Normal and Superconducting) Bending Magnet Based on Iron Magnetization for 80-100 km Lepton / Hadron Colliders	hadron, dipole, injection, lepton	980
	A. Milanese, L. Rossi CERN, Geneva, Switzerland H. Piekarz Fermilab, Batavia, Illinois, USA
	This paper presents a conceptual design of bending magnets to be used first in a full energy booster for a lepton machine (TLEP) and later in a low energy ring for a hadron machine (VHE-LHC). TLEP and VHE-LHC would be respectively e-ebar and p-p colliders, at the energy frontier in each category, to be installed in a 80-100 km circumference tunnel. The main requirements in terms of operating field range and field quality are discussed. Two dimensional simulations then show how an iron-dominated magnet could fulfil the specifications. The design is a "transmission-line" magnet, where the excitation current is provided by a single turn. When operating with leptons, a resistive conductor can be used. To then increase the strength needed to handle hadrons, the use of superconducting technology is needed. Recent results on similar prototypes built for different machines are recalled to point to the developments needed to assess the viability of this design.
	Slides TUOCB01 [4.225 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUOCB01
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPRO004	Polarized Protons and Deuterons at NICA@JINR	proton, luminosity, polarization, ion	1000
	A.D. Kovalenko, A.V. Butenko, V.D. Kekelidze, V.A. Mikhaylov JINR, Dubna, Moscow Region, Russia Y. Filatov MIPT, Dolgoprudniy, Moscow Region, Russia A.M. Kondratenko, M.A. Kondratenko Science and Technique Laboratory Zaryad, Novosibirsk, Russia
	Different aspects of the NICA facility operation in polarized proton and deuteron modes aimed at reaching the highest possible luminosity and polarization degree as well are analysed. The main aim is to provide average luminosity L ≥ 1•1032 cm^-2 s⁻¹ at √sNN ≥ 26-27 GeV for single-spin proton collisions. Optimal schemes of the Siberian Snake insertions to the Nuclotron and NICA collider rings were proposed. The results of simulations are presented and discussed.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRO004
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPRO005	Status of the NICA Project at JINR	ion, booster, experiment, electron	1003
	G.V. Trubnikov, N.N. Agapov, A.V. Butenko, D.E. Donets, E.D. Donets, E.E. Donets, A.V. Eliseev, E.V. Gorbachev, A. Govorov, E.V. Ivanov, V. Karpinsky, V.D. Kekelidze, H.G. Khodzhibagiyan, S.A. Kostromin, A.D. Kovalenko, O.S. Kozlov, V.A. Matveev, I.N. Meshkov, V.A. Mikhailov, V. Monchinsky, N. Shurkhno, A.O. Sidorin, I. Slepnev, V. Slepnev, A.V. Smirnov, A. Sorin, N.D. Topilin, A. Tuzikov, V. Volkov JINR, Dubna, Moscow Region, Russia O.I. Brovko, A.V. Philippov, N.V. Semin JINR/VBLHEP, Moscow, Russia
	Nuclotron-based Ion Collider fAcility (NICA) is the new accelerator complex being constructed in Joint Institute for Nuclear Research. General goal of the project is to provide experimental study of hot and dense strongly interacting QCD matter. The development of NICA injection complex is actively performed. Construction of new 3.2 MeV/u heavy-ion linear accelerator (HILac) is now under way in Germany. Construction of booster has been started. In this report the present status of the NICA accelerator complex are presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRO005
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPRO009	Simple Models Describing the Time-evolution of Luminosity in Hadron Colliders	luminosity, hadron, proton, operation	1017
	M. Giovannozzi CERN, Geneva, Switzerland
	In recent years, several studies have been performed to describe the evolution of the losses in circular proton machines. Considerations based on single-particle, non-linear beam dynamics allowed building models that, albeit simple, proved to be in good agreement with measurements. These initial results have been generalised, thus opening the possibility to describe the luminosity evolution in a circular hadron collider. In this paper, the focus is on the derivation of scaling laws for the integrated luminosity, taking into account both burn off and additional pseudo-diffusive effects. The proposed models are applied to the analysis of the data collected during the LHC Run I and the outcome is discussed in detail.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRO009
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPRO011	New Tools for K-modulation in the LHC	quadrupole, injection, optics, controls	1024
	M. Kuhn, B. Dehning, V. Kain, R. Tomás, G. Trad CERN, Geneva, Switzerland
	For many applications, the precise knowledge of the beta function at a given location is essential. Several measurement techniques for optics functions are used in the LHC to provide the most suitable method for a given scenario. A new tool to run k-modulation measurements and analysis is being developed with the aim to be fully automatic and online. It will take constraints of various systems such as tune measurement precision, powering limits of the LHC superconducting circuits and limits of their quench protection systems into account. It will also provide the possibility to sinusoidally modulate the currents of the investigated quadrupoles with a predefined frequency and amplitude to increase the measurement precision further. This paper will review the advantages and limitations of k-modulation measurements in the LHC with and without sinusoidal current modulation. The used algorithms and tools will be presented and estimates on the obtainable beta function measurement precision will be given.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRO011
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPRO026	Possible Beam-beam and Levelling Scenarios for HL-LHC	luminosity, emittance, simulation, hadron	1071
	M.P. Crouch, R. Appleby UMAN, Manchester, United Kingdom B.D. Muratori STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom T. Pieloni CERN, Geneva, Switzerland
	Funding: Research supported by EU FP7 HiLumi LHC - Grant Agreement 284404 The upgrade of the LHC from the current set-up to high luminosity performances will provide new challenges from the point of view of beam-beam as well as other collective effects and luminosity levelling. We present the current possibilities for doing luminosity levelling for HL-LHC. We explore the merits and drawbacks of each option and briefly discuss the operational implications. The simplest option being levelling with an offset between the two beams. In particular, we look at the possibility of using flat beams in the IPs for all the available options and investigate their benefits and drawbacks, using the code COMBI. Flat beams would allow an additional degree of freedom, with the levelling only required in one of the planes at any given IP. To this end, various scenarios are looked at, both with and without crab cavities.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRO026
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPRO030	Mitigating Radiation Impact on Superconducting Magnets of the Higgs Factory Muon Collider	detector, radiation, dipole, factory	1084
	N.V. Mokhov, Y.I. Alexahin, V.V. Kashikhin, S.I. Striganov, I.S. Tropin, A.V. Zlobin Fermilab, Batavia, Illinois, USA
	Funding: Work supported by Fermi Research Alliance, LLC, under contract No. DE-AC02-07CH11359 with the U.S. Department of Energy through the DOE Muon Accelerator Program (MAP). Recent discovery of a Higgs boson boosted interest in a low-energy medium-luminosity Muon Collider as a Higgs Factory (HF). A preliminary design of the HF storage ring (SR) is based on cos-theta Nb3Sn superconducting (SC) magnets with the coil inner diameter ranging from 50 cm in the interaction region to 16 cm in the arc. The coil cross-sections were chosen based on the operation margin, field quality and quench protection considerations to provide an adequate space for the beam pipe, helium channel and inner absorber (liner). With the 62.5-GeV muon energy and 2×10¹² muons per bunch, the electrons from muon decays deposit about 300 kW in the SC magnets, or unprecedented 1 kW/m dynamic heat load, which corresponds to a multi-MW room temperature equivalent. Based on the detailed MARS15 model built and intense simulations, a sophisticated protection system was designed for the entire SR to bring the peak power density in the SC coils safely below the quench limit and reduce the dynamic heat load to the cold mass by a factor of 100. The system consists of tight tungsten masks in the magnet interconnect regions and elliptical tungsten liners optimized for each magnet.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRO030
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPRO034	Beam-beam Interaction in the Asymmetric Energy Gold-gold Collision in RHIC	simulation, ion, emittance, experiment	1093
	Y. Luo, M. Blaskiewicz, M.R. Costanzo, W. Fischer, X. Gu, V.H. Ranjbar, S.M. White BNL, Upton, Long Island, New York, USA
	Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy. In this article, we study the beam-beam interaction in the possible future gold-gold collision with different particle energies in the Relativistic Heavy Ion Collider (RHIC). With different particle energies, the center-of-mass of collision is moving in the longitudinal direction during collision. Since the RF harmonic numbers are different for the two RHIC rings, bunches collide in 110 turns followed by 10 turns without collision. In this study, the stability of particles and the beam emittance growth are calculated through numeric simulations based on a 6-D weak-strong beam-beam interaction model.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRO034
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPRO062	Improvements in the Optics Measurement Resolution for the LHC	optics, simulation, dipole, operation	1177
	A. Langner, R. Tomás CERN, Geneva, Switzerland
	Optics measurement algorithms which are based on the measurement of beam position monitor (BPM) turn-by-turn data are currently being improved in preparation for the commissioning of the LHC at higher energy. The turn-by-turn data of one BPM may be used more than once, but the implied correlations were not considered in the final error bar. In this paper the error propagation including correlations is studied for the statistical part of the uncertainty. The confidence level of the measurement is investigated analytically and with simulations.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRO062
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPRO069	First Studies of Two-beam Tuning in the CLIC BDS	sextupole, luminosity, linear-collider, simulation	1195
	J. Snuverink JAI, Egham, Surrey, United Kingdom A. Latina, R. Tomás CERN, Geneva, Switzerland
	Beam tuning in the beam delivery system (BDS) is one of the major challenges for the future linear colliders. Up to now single beam tuning has been performed, both in simulations and experiments at the Accelerator Test Facility (ATF). However, in future linear colliders, due to fast detuning of the final focus optics both beamlines will need to be tuned simultaneously. In this paper a first two-beam tuning study for the Compact Linear Collider (CLIC) BDS is presented applying the usual toolbox of beam-based alignment (BBA) and sextupole knobs.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRO069
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPRO113	Design and Measurement of a Low-energy Tunable Permanent Magnet Quadrupole Prototype	quadrupole, permanent-magnet, linear-collider, magnet-design	1316
	B.J.A. Shepherd, J.A. Clarke, P. Wadhwa STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom A. Bartalesi, M. Modena, M. Struik CERN, Geneva, Switzerland N.A. Collomb STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom
	The 42 km long CLIC Drive Beam Decelerator (DBD) will decelerate beams of electrons from 2.4 GeV to 240 MeV. ASTeC in collaboration with CERN has developed a novel type of tunable permanent magnet quadrupole for the DBD. Two versions of the design were produced, for the high-energy and low-energy ends of the DBD respectively. This paper outlines the design of the low-energy version, which has a tuning range of 3.5-43 T/m. A prototype was built at Daresbury Laboratory (DL) in 2013, and extensive magnetic measurements were carried out at DL.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRO113
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPME005	CLIC FFS Lattice Proposals Combining Local and Non-local Chromaticity Corrections	lattice, sextupole, linear-collider, interaction-region	1343
	O.R. Blanco-García, P. Bambade LAL, Orsay, France R. Tomás CERN, Geneva, Switzerland
	The requirements on the Final Focusing System (FFS) for a new linear collider has lead to lattice designs where chromaticity is corrected either locally or non-locally. Here, alternative proposals of lattice design are presented for the current CLIC 500GeV beam parameters, combining the local chromaticity correction on the vertical plane and non-local correction on the horizontal. The tight tolerance on phase advances and beta functions imposed to obtain -I transformation required to cancel the chromatic terms is relaxed by enlarging the system length and using a more general transformation definition, aiming to obtain better results in tuning simulations.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPME005
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPME006	Considerations for a QD0 with Hybrid Technology in ILC	alignment, quadrupole, experiment, luminosity	1346
	M. Modena, A.V. Aloev, H. Garcia, L. Gatignon, R. Tomás CERN, Geneva, Switzerland
	The baseline design of the QD0 magnet for ILC, the International Linear Collider, is a very compact superconducting quadrupole (coil-dominated magnet). A prototype of this quadrupole is under construction at Brookhaven National Laboratory (USA). In CLIC, the Compact Linear Collider under study at CERN, we are studying another conceptual solution for the QD0. This is due to two main reasons: all the magnets of the Beam Delivery System will need to be stabilized in the nano-meter range and extremely tight alignment tolerances are required. The proposed solution, now baseline for CLIC, is a room temperature hybrid quadrupole based on electromagnetic coils and permanent magnet blocks (iron-dominated magnet). In this paper we present a conceptual design for a hybrid solution studied and adapted also to the ILC project. A special super-ferric solution is proposed to make the cross section compatible with the experiments layout. This design matches the compactness requirement with the advantages of stability and alignment precision, aspects critical also for ILC in order to achieve the design luminosity. Final Focus optics design considerations for this solution are also presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPME006
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPME007	Status of CLIC Magnets Studies and R&D	quadrupole, dipole, status, linear-collider	1350
	M. Modena, A.V. Aloev, E. Solodko, P.A. Thonet, A.S. Vorozhtsov CERN, Geneva, Switzerland
	Since 2009 the CERN Magnet Group (CERN-TE-MSC) started R&D activities in order to focalize the most challenging and interesting cases to be studied among the magnets needed for CLIC the Compact Linear Collider. In the last four years several theoretic studies, models and prototypes were realized mainly in two domains: magnets for the Modules, the modular elements that are composing the backbone of the two-beam linac structure of CLIC, and the Machine Detector Interface (MDI) including the Final Focus elements, and the anti-solenoid. In this paper we revise the status for the procured magnets. Among them the Drive Beam Quadrupoles, Main Beam Quadrupoles, Steering Correctors all challenging for the required compactness, performances and production size, and the QD0 final quadrupole and the close SD0 sextupole, challenging for the high performances required in terms of gradients and stability.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPME007
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPME008	Status of the CLIC-UK R&D Programme on Design of Key Systems for the Compact Linear Collider	cavity, feedback, quadrupole, linear-collider	1354
	P. Burrows, R. Ainsworth, T. Aumeyr, D.R. Bett, N. Blaskovic Kraljevic, L.M. Bobb, S.T. Boogert, A. Bosco, G.B. Christian, L. Corner, F.J. Cullinan, M.R. Davis, D. Gamba, P. Karataev, K.O. Kruchinin, A. Lyapin, L.J. Nevay, C. Perry, J. Roberts, J. Snuverink, J.R. Towler JAI, Oxford, United Kingdom R. Ainsworth, T. Aumeyr, S.T. Boogert, A. Bosco, P. Karataev, K.O. Kruchinin, L.J. Nevay, J.R. Towler Royal Holloway, University of London, Surrey, United Kingdom P.K. Ambattu, G. Burt, A.C. Dexter, M. Jenkins, S. Karimian, C. Lingwood, B.J. Woolley Cockcroft Institute, Lancaster University, Lancaster, United Kingdom L.M. Bobb, R. Corsini, D. Gamba, A. Grudiev, A. Latina, T. Lefèvre, C. Marrelli, M. Modena, J. Roberts, H. Schmickler, D. Schulte, P.K. Skowroński, J. Snuverink, S. Stapnes, F. Tecker, R. Tomás, R. Wegner, M. Wendt, W. Wuensch CERN, Geneva, Switzerland J.A. Clarke, S.P. Jamison, P.A. McIntosh, B.J.A. Shepherd STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom N.A. Collomb, D.G. Stokes STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom L. Corner Oxford University, Physics Department, Oxford, Oxon, United Kingdom W.A. Gillespie, R. Pan, M.A. Tyrk, D.A. Walsh University of Dundee, Nethergate, Dundee, Scotland, United Kingdom R.M. Jones UMAN, Manchester, United Kingdom
	Six UK institutes are engaged in a collaborative R&D programme with CERN aimed at demonstrating key aspects of technology feasibility for the Compact Linear Collider (CLIC). We give an overview and status of the R&D being done on: 1) Drive-beam components: quadrupole magnets and the beam phase feed-forward prototype. 2) Beam instrumentation: stripline and cavity beam position monitors, an electro-optical longitudinal bunch profile monitor, and laserwire and diffraction and transition radiation monitors for transverse beam-size determination. 3) Beam delivery system and machine-detector interface design, including beam feedback/control systems and crab cavity design and control. 4) RF structure design. In each case, where applicable, we report on the status of prototype systems and performance tests with beam at the CTF3, ATF2 and CesrTA test facilities, including plans for future experiments.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPME008
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPME012	The US Muon Accelerator Program	factory, proton, target, linac	1367
	M.A. Palmer Fermilab, Batavia, Illinois, USA
	Funding: Work supported by US DOE under contract DE-AC02-07CH11359. A directed R&D program is presently underway in the U.S. to evaluate the designs and technologies required to provide muon-based high energy physics (HEP) accelerator capabilities. Such capabilities have the potential to provide unique physics reach for the HEP community. An overview of the status of the designs for the neutrino factory and muon collider applications is provided. Recent progress in the technology R&D program is summarized.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPME012
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPME014	Development of Six-dimensional Helical Muon Beam Cooling Channel for Muon Colliders	emittance, solenoid, cavity, magnet-design	1373
	K. Yonehara Fermilab, Batavia, Illinois, USA
	A six-dimensional (6D) helical muon beam cooling channel (HCC) has been developed for a last decade. The practical HCC lattice parameters were optimized for the cooling performance in theoretical and numerical simulations. The HCC design group has been formed and has begun the machine development to realize the channel. Recent accomplishments and present critical issues are discussed in the presentation.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPME014
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPME015	Study Cooling Performance in a Helical Cooling Channel for Muon Colliders	emittance, simulation, solenoid, plasma	1376
	K. Yonehara Fermilab, Batavia, Illinois, USA
	The cooling performance in a six-dimensional helical muon beam cooling channel (HCC) has been studied in various beam lattice parameters. We show that the HCC works with a practical beam parameter.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPME015
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPME016	Status of the Complete Muon Cooling Channel Design and Simulations	emittance, solenoid, simulation, luminosity	1379
	C.Y. Yoshikawa, C.M. Ankenbrandt, R.P. Johnson, S.A. Kahn, F. Marhauser Muons, Inc, Illinois, USA Y.I. Alexahin, D.V. Neuffer, K. Yonehara Fermilab, Batavia, Illinois, USA Y.S. Derbenev, V.S. Morozov, A.V. Sy JLab, Newport News, Virginia, USA
	Funding: Work supported in part by DOE STTR grant DE-SC 0007634. Muon colliders could provide the most sensitive measurement of the Higgs mass and return the US back to the Energy Frontier. Central to the capabilities of such muon colliders are the cooling channels that provide the extraordinary reduction in emittance required for the precise Higgs mass measurement and increased luminosity for enhanced discovery potential of an Energy Frontier Machine. We present the status of the design and simulation of a complete muon cooling channel that is based on the Helical Cooling Channel (HCC), which operates via continuous emittance exchange to enable the most efficient design.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPME016
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPME017	Design and Simulation of a Matching System into the Helical Cooling Channel	solenoid, emittance, simulation, operation	1382
	C.Y. Yoshikawa MuPlus, Inc., Newport News, Virginia, USA Y.I. Alexahin, D.V. Neuffer, K. Yonehara Fermilab, Batavia, Illinois, USA C.M. Ankenbrandt, R.P. Johnson, S.A. Kahn, F. Marhauser Muons, Inc, Illinois, USA Y.S. Derbenev, V.S. Morozov, A.V. Sy JLab, Newport News, Virginia, USA
	Funding: Work supported in part by DOE STTR grant DE-SC 0007634. Muon colliders could provide the most sensitive measurement of the Higgs mass and return the US back to the Energy Frontier. Central to the capabilities of muon colliders are the cooling channels that provide the extraordinary reduction in emittance required for the precise Higgs mass measurement and increased luminosity for enhanced discovery potential of an Energy Frontier Machine. The Helical Cooling Channel (HCC) is able to achieve such emittance reduction and matching sections within the HCC have been successfully designed in the past with lossless transmission and no emittance growth. However, matching into the HCC from a straight solenoid poses a challenge, since a large emittance beam must cross transition. We elucidate on the challenge and present evaluations of two solutions, along with concepts to integrate the operations of a Charge Separator and match into the HCC.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPME017
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPME020	Complete Six-dimensional Muon Cooling Channel for a Muon Collider	emittance, lattice, focusing, solenoid	1389
	D. Stratakis, J.S. Berg, R.B. Palmer, H. Witte BNL, Upton, Long Island, New York, USA
	Funding: Work supported by Brookhaven Science Associates, LC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy. We describe a complete 6D rectilinear cooling scheme for use in a Muon Collider. This scheme uses separate 6D cooling channels for the two signs of particle charge. In each, a channel first reduces the emittance of a train of 21 muon bunches until it becomes possible to merge them into a single bunch, one of each sign. The single bunches are then sent through a second rectilinear channel for further cooling towards the requirements of a Muon Collider. We adopt this approach for a new cooling lattice design for the Muon Collider, and for the first time present a end-to-end simulation. We review key parameters such as the required focusing fields, absorber lengths, cavity frequencies and rf gradients. *D. Stratakis et al., Phys. Rev. ST AB 16, 091001 (2013).
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPME020
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPME021	Theoretical Framework to Predict Efficiency of Ionization Cooling Lattices	emittance, focusing, lattice, betatron	1392
	D. Stratakis BNL, Upton, Long Island, New York, USA D.V. Neuffer Fermilab, Batavia, Illinois, USA
	Funding: Work supported by Brookhaven Science Associates, LC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy. Reduction of the 6-dimensional phase-space of a muon beam by 6 orders of magnitude is a key requirement for a Muon Collider. Recently, a 12-stage rectilinear ionization cooling channel has been proposed to achieve that goal. In this paper, we establish the mathematical framework to predict and evaluate the cooling performance of the proposed channel. We predict the system effectiveness, by deriving key lattice parameters such as the lattice quality factor which describes the rate of cooling versus the surviving particles and the longitudinal and effective partition numbers for each stage. Main theoretical findings, such as the equilibrium emittances and effective cooling length, are compared against findings from numerical simulations.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPME021
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPRI008	Target System Concept for a Muon Collider/Neutrino Factory	target, proton, factory, solenoid	1568
	K.T. McDonald PU, Princeton, New Jersey, USA X.P. Ding UCLA, Los Angeles, California, USA V.B. Graves ORNL, Oak Ridge, Tennessee, USA H.G. Kirk, H. K. Sayed, D. Stratakis BNL, Upton, Long Island, New York, USA N. Souchlas, R.J. Weggel Particle Beam Lasers, Inc., Northridge, California, USA
	A concept is presented for a Target System in a staged scenario for a Neutrino Factory and eventual Muon Collider, with emphasis on initial operation with a 6.75 GeV proton beam of 1 MW power, and 50 Hz of pulses 3-ns long. A radiation cooled graphite target will be used in the initial configuration, with an option to replace this with a free-liquid-metal-jet target should 4-MW beam power become available at a later stage.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRI008
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPRI048	A Map Approach for Electron Cloud Density in a Strong LHC Dipole	electron, simulation, dipole, space-charge	1674
	S. Petracca, A. Stabile U. Sannio, Benevento, Italy A. Stabile INFN-Salerno, Baronissi, Salerno, Italy
	The luminosity is limited by the electron cloud effects in presently running and proposed future storage rings. The evolution of the electron density during the electron cloud formation can be reproduced using a bunch-to-bunch iterative map formalism. By performing simulation codes this approach has been used to obtain a numerical prediction of the coefficients in the map, while in the presence of a magnetic field an analytic formula has been obtained for the linear coefficient. The next goal is finding a theoretical prescription of the quadratic coefficient at least in the presence of magnetic dipole. Then it will be possible to reproduce, by using the map formalism, the dynamics of electron cloud without performing the simulations.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRI048
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPRI088	Active Vibration Isolation System for CLIC Final Focus	controls, linear-collider, ground-motion, luminosity	1775
	G. Balik, N. Allemandou, J. Allibe, J.P. Baud, L. Brunetti, G. Deleglise, A. Jeremie, S. Vilalte IN2P3-LAPP, Annecy-le-Vieux, France B. Caron, C. Hernandez SYMME, Annecy-le-Vieux, France
	With pinpoint accuracy, the next generation of Linear Collider such as CLIC will collide electron and positron beams at a centre of mass energy of 3 TeV with a desired peak luminosity of 2*1034 cm^-2s⁻¹. One of the many challenging features of CLIC is its ability to collide beams at the sub-nanometer scale at the Interaction Point (IP). Such a high level of accuracy could only be achieved by integrating Active Vibration Isolation system (AVI) upstream the collision to prevent the main source of vibration; Ground Motion (GM). Complementary control systems downstream the collision (Interaction Point FeedBack (IPFB), Orbit FeedBack(OFB)) allow low frequency vibration rejection. This paper focus on a dedicated AVI table designed for the last focusing quadrupole QD0 where the specifications are the most stringent. Combining FeedForward (FF) and FeedBack (FB) techniques, the prototype is able to reduce GM down to 0.6 nm RMS(4Hz) experimentally without load. These performances couldn’t be achieved without cutting edge-technology such as sub-nanometer piezo actuator, ultra-low noise accelerometer and seismometers and an accurate guidance system. The whole AVI system is described in detail.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRI088
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPRI095	Design and Study on a 5 Degree-of-freedom Adjustment Platform for CLIC Drive Beam Quadrupoles	quadrupole, alignment, linear-collider, linac	1796
	M. Sosin, M. Anastasopoulos, M. Duquenne, J. Kemppinen, H. Mainaud Durand, V. Rude, J. Sandomierski CERN, Geneva, Switzerland
	Since several years CERN is studying the feasibility of building a high energy e⁺ e⁻ linear collider: the CLIC (Compact LInear Collider). The pre-alignment precision and accuracy requirement for the transverse positions of the linac components is typically 14 micrometers over a sliding window of 200m. One of the challenges is precise adjustment of Drive Beam quadrupole’s magnetic axis. It has to be done with micrometric resolution along 5 DOF in a common support’s coordinate system. This paper describes the design and the study of a solution based on flexural components in a type of “Stewart Platform” configuration. The engineering approach, the lessons learned (“know how”), the issues of adjustment solution and the mechanical components behaviors are presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRI095
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPRI116	Engineering Data Management for the ILC Site Specific Design Phase	site, lattice, positron, linear-collider	1839
	B. List, L. Hagge, J. Kreutzkamp, N.J. Walker DESY, Hamburg, Germany
	In August 2013, the Japanese ILC Site Evaluation Committee has recommended the Kitakami area in northern Japan as the technically preferred site for the International Linear Collider (ILC) in Japan. With this decision, the ILC planning has moved into a new stage where the Technical Design Report baseline design has to be adapted to the specific site, and refined in preparation for a possible construction project. Engineering data management provides the methods and supporting tools to create and maintain the design data throughout the entire life of the ILC project. The Management and integration of engineering data from the design teams around the globe that contribute to the ILC requires a carefully structured body of documentation, clearly defined processes including configuration control, and efficient vision sharing through 3D modelling.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRI116
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEZA02	A Staged Muon Accelerator Facility for Neutrino and Collider Physics	factory, proton, linac, target	1872
	J.-P. Delahaye SLAC, Menlo Park, California, USA C.M. Ankenbrandt, S. Brice, A.D. Bross, D.S. Denisov, E. Eichten, S.D. Holmes, R.J. Lipton, D.V. Neuffer, M.A. Palmer Fermilab, Batavia, Illinois, USA S.A. Bogacz JLab, Newport News, Virginia, USA P. Huber Virginia Polytechnic Institute and State University, Blacksburg, Virginia, USA D.M. Kaplan, P. Snopok Illinois Institute of Technology, Chicago, Illinois, USA H.G. Kirk, R.B. Palmer BNL, Upton, Long Island, New York, USA R.D. Ryne LBNL, Berkeley, California, USA
	Funding: Work supported by the U.S. Dept. of Energy under contracts DE-AC02-07CH11359 and DE-AC02-76SF00515 Muon-based facilities offer unique potential to provide capabilities at both the Intensity Frontier with Neutrino Factories and the Energy Frontier with Muon Colliders. They rely on a novel technology with challenging parameters, for which the feasibility is currently being evaluated by the Muon Accelerator Program (MAP). A realistic scenario for a complementary series of staged facilities with increasing complexity and significant physics potential at each stage has been developed. It takes advantage of and leverages the capabilities already planned for Fermilab, especially the strategy for long-term improvement of the accelerator complex being initiated with the Proton Improvement Plan (PIP-II) and the Long Baseline Neutrino Facility (LBNF). Each stage is designed to provide an R&D platform to validate the technologies required for subsequent stages. The rationale and sequence of the staging process and the critical issues to be addressed at each stage, are presented.
	Slides WEZA02 [27.263 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEZA02
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEOCA03	DAΦNE Operation with the Upgraded KLOE-2 Detector	luminosity, detector, operation, coupling	1883
	C. Milardi, D. Alesini, M.E. Biagini, M. Boscolo, B. Buonomo, S. Cantarella, A. De Santis, G.O. Delle Monache, G. Di Pirro, A. Drago, L.G. Foggetta, O. Frasciello, A. Gallo, A. Ghigo, F. Guatieri, S. Guiducci, F. Iungo, C. Ligi, G. Mazzitelli, L. Pellegrino, R. Ricci, U. Rotundo, C. Sanelli, G. Sensolini, M. Serio, A. Stecchi, A. Stella, M. Zobov INFN/LNF, Frascati (Roma), Italy R. Gargana, A. Michelotti Consorzio Laboratorio Nicola Cabibbo, Frascati, Italy D.N. Shatilov BINP SB RAS, Novosibirsk, Russia M. Tobiyama KEK, Ibaraki, Japan A. Valishev Fermilab, Batavia, Illinois, USA
	The DAΦNE collider has been successfully commissioned after the experimental detector modification and a major upgrade and consolidation program involving a large part of the accelerator complex. This paper presents the Φ-Factory setup and the achieved performances in terms of beam currents, luminosity, detector background and related aspects.
	Slides WEOCA03 [2.424 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEOCA03
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEIB05	Big Science Projects - What is it that makes some a success and others to fail?	factory, plasma, operation, heavy-ion	4099
	J.H. Yeck ESS, Lund, Sweden
	This presentation analyses the driving forces behind big science projects (which are very different compared to similarly complex but totally commercial projects). This presentation should be enlightening and a big help for anyone wanting to make business with big science projects.
	Slides WEIB05 [3.312 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEIB05
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPME057	The Secondary Electron Yield from Transition Metals	electron, vacuum, gun, hadron	2403
	S. Wang, M.D. Cropper Loughborough University, Loughborough, Leicestershire, United Kingdom O.B. Malyshev, E.A. Seddon, R. Valizadeh, S. Wang STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
	Non-evaporable getter thin films, which are currently being used in the ultra-high vacuum system of the Large Hadron Collider, normally consist of Ti, Zr and V, deposited by physical vapour deposition. In this study, the secondary electron yield (SEY) of bulk Ti, Zr, V and Hf have been investigated as a function of electron conditioning. The maximum SEYs of as-received Ti, Zr, V and Hf, are respectively 1.96, 2.34, 1.72 and 2.32, these reduce to 1.14, 1.13, 1.44 and 1.18 after electron conditioning. Surface chemical composition was studied by X-ray photoelectron spectroscopy which revealed that surface conditioning by electron bombardment promotes the growth of a thin carbon layer on the surface and consequently reduces the SEY of the surface as a function of electron dose. Heating a vanadium sample to 250°C resulted in diffusion of oxygen into the bulk and induced formation of metal carbide at the surface. However, the SEY stays the same even after heat-induced surface chemistry modification. Prolonged electron conditioning increases the surface oxygen but the surface is still predominantly covered with a thin graphitic layer and hence the SEY stays approximately constant.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPME057
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPRI088	Magnetic Measurement System for the NICA Booster Magnets	dipole, booster, controls, LabView	2696
	V.V. Borisov, A. Donyagin, O. Golubitsky, A. Golunov, N. Gorbunov, H.G. Khodzhibagiyan, N.A. Morozov, S. Rubtsun JINR, Dubna, Moscow Region, Russia
	NICA is a new accelerator collider complex presently under construction at Joint Institute for Nuclear Research (JINR) in Dubna. More than 250 superconducting magnets need for the NICA booster and collider. These magnets will be assembled and tested at the new test facility in the Laboratory of High Energy Physics JINR. The first phase of the system for magnetic measurements was commissioned in late 2013. A method of measuring the quality of the magnetic field in the aperture of the curved dipole magnet for the booster synchrotron is described. First results of magnetic measurements are presented and discussed. Commissioning of equipment for magnetic measurements in the aperture of quadrupole magnets for the NICA booster is close to completion.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPRI088
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPRI089	Facility for Assembling and Serial Test of Superconducting Magnets	booster, quadrupole, dipole, synchrotron	2700
	S.A. Kostromin, N.N. Agapov, V.V. Borisov, A.R. Galimov, V. Karpinsky, H.G. Khodzhibagiyan, V.S. Korolev, D. Nikiforov, N.V. Semin, A.Y. Starikov, G.V. Trubnikov JINR, Dubna, Moscow Region, Russia
	The NICA/MPD project has been started at the Joint Institute for Nuclear Research (JINR) in Dubna in 2007. The NICA accelerator complex will consist of two injector chains, the new 600 MeV/u superconducting (SC) booster synchrotron, the existing SC synchrotron Nuclotron, and the new SC collider having two rings each of 503 m in circumference. The building construction of the new test facility for simultaneous cryogenic testing of the SC magnets on 6 benches is completed at the Laboratory of High Energy Physics. Premises with an area of 2600 m2 were prepared to install the equipment. The 15 kA, 25 V pulse power supply, the helium satellite refrigerator with capacity of 100 W were commissioned first bench for magnets testing is now under assembling. First magnets cryogenic tests are planned on July. Start of the serial production of the SC magnets for the booster synchrotron is planned for the end of 2014.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPRI089
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPRI103	Magnet Design for a Six-dimensional Rectilinear Cooling Channel - Feasibility Study	solenoid, dipole, simulation, emittance	2740
	H. Witte, J.S. Berg, R.B. Palmer, D. Stratakis BNL, Upton, Long Island, New York, USA F. Borgnolutti LBNL, Berkeley, California, USA
	Funding: Work supported by Brookhaven Science Associates, LC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy. An essential part of a potential future muon collider is ionization cooling, which is required to reduce the emittance of the muon beam. A new scheme has recently been proposed which in simulations shows an improved performance in terms of cooling efficiency and transmitted muons. The lattice of this cooling channel consists of 12 stages, each of which requires different superconducting solenoids. The most challenging stage is the last one, where the solenoids are expected to deliver 15.1T in a bore of ~4.5 cm. This paper discusses the feasibility of the solenoids for the last stage of this lattice.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPRI103
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPRI108	Liquid Helium Technologies at Cryogenic Complex of the Heavy Ion Collider NICA	cryogenics, superconducting-magnet, booster, ion	2752
	Iu.A. Mitrofanova, N.N. Agapov, N. Emelianov, H.G. Khodzhibagiyan, D. Nikiforov JINR, Dubna, Moscow Region, Russia R. Herzog, A. Kade, J. Klier ILK Dresden, Dresden, Germany
	NICA (Nuclotron-based Ion Collider fAcility), presently under construction at JINR, will be, upon its completion, among the most advanced research instruments of the physics community. The facility is aimed at providing collider experiments with heavy ions up to uranium (gold at the beginning stage) with a centre of mass energy up to 11 GeV/u and an average luminosity up to 10²⁷ cm^-2 s⁻¹. The NICA cryogenics includes a large number of technical ideas and solutions never used before. The most significant of these solutions are the fast cycling superconducting magnets, cooling by the two-phase helium flow, an unusually short period of time for cool down till the operating temperature, parallel connection of cooling channels of the magnets, «wet» turbo expanders, screw compressors with the outlet pressure of more than 25 bars and jet pumps for liquid helium. These technical solutions allow one to construct an efficient and reliable cryogenic system of the NICA complex.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPRI108
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPPA02	Gersch Budker Prize Presentation	klystron, linear-collider, electron, FEL	2846
	T. Shintake OIST, Onna-son, Okinawa, Japan
	SACLA: SPring-8 Angstrom Compact free-electron Laser, previously called XFEL/SPring-8, which is based on electron accelerator technology developed at SCSS project, in which C-band high gradient linear accelerator provides stable driving beams. Looking back upon 20 years R&D on C-band accelerator, I would like to give some advises to young scientists on doing research. The developed C-band accelerator is now providing 8 GeV electron beams at SACLA X-ray FEL in daily operation with the world best energy stability among these large scale machines.
	Slides THPPA02 [17.649 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPPA02
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPRO028	Bunch Compressor Design for CLIC Drive Beam	gun, linac, cathode, linear-collider	2924
	A.A. Aksoy Ankara University, Accelerator Technologies Institute, Golbasi / Ankara, Turkey J. Esberg, D. Schulte CERN, Geneva, Switzerland
	The drive-beam linac which is required for generation RF power at Compact Linear Collider (CLIC) has to accelerate an electron beam with 8.4 nC per bunch up to 2.4 GeV in almost fully loaded structures. The required beam stability in both transverse and longitudinal directions are of concern for such a high bunch charge. We present different bunch compressor designs for the Drive Beam and compare their performance including the effects beam energy and phase jitters.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRO028
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPME054	RF Cavity Design Aspects for a Helical Muon Beam Cooling Channel	cavity, Windows, embedded, factory	3352
	F. Marhauser, G. Flanagan, R.P. Johnson, S.A. Kahn Muons, Inc, Illinois, USA K. Yonehara Fermilab, Batavia, Illinois, USA
	Funding: Work supported under U.S. DOE Grant Application Number DE-SC0006266 A Helical Cooling Channel (HCC) promises efficient six-dimensional ionization cooling of muon beams by utilizing high-pressurized gas as a continuous absorber within a magnetic channel embedding RF cavities. The progress on cavity design, tailored for such a cooling channel, is discussed.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME054
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPME153	The New Optical Device for Turn-to-turn Beam Profile Measurement	electron, storage-ring, synchrotron, positron	3617
	O.I. Meshkov, V.L. Dorohov, A.A. Ivanova, A.D. Khilchenko, A.I. Kotelnikov, A.N. Kvashnin, P.V. Zubarev BINP SB RAS, Novosibirsk, Russia S.V. Ivanenko, E.A. Puryga Budker Institute of Nuclear Physics, Novosibirsk, Russia V. Korchuganov RRC, Moscow, Russia Stirin, A.I. Stirin NRC, Moscow, Russia
	The linear avalanche photodiodes array is applied for turn-to-turn beam profile measurement at Siberia-2 synchrotron light source. The apparatus is able to record a transversal profile of selected bunch and analyze the dynamics of beam during 2²⁰ turns. The first experience with application of new diagnostics for routine use at the installation is described.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME153
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPME155	Beam Phase Space Reconstruction for Monitoring the Luminosity in the VEPP-2000 Collider	electron, luminosity, positron, lattice	3623
	A.L. Romanov, I. Koop, E. Perevedentsev, D.B. Shwartz BINP SB RAS, Novosibirsk, Russia
	16 synchrotron light imaging monitors available in VEPP-2000 can be used for evaluation of dynamic betas and emittances at collision. Tomographic techniques are useful for reconstruction of non-gaussian beam phase space at the IPs at high intensities of colliding bunches. The output is applied for prompt luminosity monitoring.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME155
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPRI003	Beam-beam Simulation Study for CEPC	simulation, luminosity, dynamic-aperture, damping	3763
	Y. Zhang IHEP, Beijing, People's Republic of China K. Ohmi, D. Zhou KEK, Ibaraki, Japan D.N. Shatilov BINP SB RAS, Novosibirsk, Russia
	CEPC is an Circular Electron Positron Collider proposed to carry out high precision study on Higgs bosons. It is similar to TLEP project , the luminosity and beam lifetime may be determined by the beamstrahlung effect. We try to check the resonability of the machine parameters with weak-strong and strong-strong simulation. At the same time we also do some cross-check between different codes. We wish the work could help determine the beam parameters which could achieve design luminosity.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRI003
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPRI004	FCC-ee/CepC Beam-beam Simulations with Beamstrahlung	simulation, luminosity, radiation, photon	3766
	K. Ohmi KEK, Ibaraki, Japan F. Zimmermann CERN, Geneva, Switzerland
	Beamstrahlung, namely synchrotron radiation emitted during the beam-beam collision, can be an important effect for circular high-energy lepton colliders such as FCC-ee (TLEP). In this paper we study beam-beam effects in the presence of energy spreading and bunch lengthening due to beamstrahlung.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRI004
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPRI007	Lattice Optimization of BEPCII Collider Rings	lattice, luminosity, simulation, sextupole	3776
	Y. Zhang, Q. Qin, C.H. Yu IHEP, Beijing, People's Republic of China
	BEPCII is a double ring e⁺e⁻ collider operating in the tau-charm region. In March 2013, the peak luminosity achieves 7.0·10³² cm^-2s^-1 with a new lower alphap lattice. The beam-beam parameter is also increased from 0.033 to 0.04 with the new lattice. In this paper we'll review the lattice optimization history briefly and focus on the optimization of the lower alphap lattice.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRI007
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPRI008	Interaction Region Lattice for FCC-ee (TLEP)	quadrupole, lattice, dynamic-aperture, luminosity	3779
	A.V. Bogomyagkov, E.B. Levichev, P.A. Piminov BINP SB RAS, Novosibirsk, Russia
	Funding: The work is supported by the Ministry of Education and Science of the Russian Federation. FCC-ee (TLEP)* project is a high-luminosity e⁺e^- collider and is an essential part of the Future Circular Collider (FCC) design study at CERN . FCC-ee is being designed to reach center-of-mass energy from 90 to 350 GeV with circumference of 80-100 km to study Higgs boson properties and perform precise measurements at the electroweak scale. It is also an intermediate step towards 100 TeV proton-proton collider built in the same tunnel. Some of the limiting factors of the new collider are total energy loss due to synchrotron radiation, beam lifetime degradation owing to beamstrahlung, geometry of the tunnel required to accommodate the successor. The present paper describes linear lattice of interaction region and results of nonlinear beam dynamics study. * M.~Koratzinos et al., ‘‘TLEP: A HIGH-PERFORMANCE CIRCULAR e⁺e⁻ COLLIDER TO STUDY THE HIGGS BOSON'', IPAC2013, Shanghai, China, TUPME040 (2013)
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRI008
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPRI010	FCC-ee Final Focus with Chromaticity Correction	dynamic-aperture, optics, sextupole, lattice	3782
	H. Garcia, R. Tomás, R. Tomás CERN, Geneva, Switzerland
	A 100 km circular electron-positron collider is considered as one of the possible future high energy facilities. In order to achieve a high luminosity, strong beam focusing at the Interaction Point is used requiring the correction of the chromatic aberrations. In this paper we study preliminary designs of a Final Focus System for the TLEP collider with chromatic correction. Beam orbit stability and dynamic aperture calculations are also presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRI010
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPRI011	Beam-machine Interaction at TLEP: First Evaluation and Mitigation of the Synchrotron Radiation Impact	dipole, synchrotron, synchrotron-radiation, radiation	3785
	L. Lari, F. Cerutti, A. Ferrari, A. Mereghetti CERN, Geneva, Switzerland L. Lari IFIC, Valencia, Spain A. Mereghetti UMAN, Manchester, United Kingdom
	In the framework of post-LHC accelerator studies, TLEP is a proposed high-luminosity circular e⁺e⁻ collider, aimed at measuring the properties of the Higgs-boson H(126) with unprecedented accuracy, as well as those of the W boson, the Z boson and the top quark. In order to calculate the impact of synchrotron radiation, the latter has been implemented in the FLUKA code as new source term. A first account of escaping power as a function of the vacuum chamber shielding thickness, photoneutron production, and activation has been obtained for the 80km circumference 175 GeV (beam energy) TLEP option. Starting from a preliminary layout of the FODO cell and a possible dipole design, energy deposition simulations have been carried out, investigating the effectiveness of absorbers in the interconnections. The results provide inputs to improve the cell design and to support mechanical integration studies.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRI011
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPRI012	Tuning of the Compact Linear Collider Beam Delivery System	luminosity, simulation, linear-collider, multipole	3788
	Y.I. Levinsen, G. Giambelli, A. Latina, R. Tomás CERN, Geneva, Switzerland H. Garcia UPC, Barcelona, Spain J. Snuverink JAI, Egham, Surrey, United Kingdom
	Tuning the CLIC Beam Delivery System (BDS), and in particular the final focus, is a challenging task. In simulations without misalignments, the goal is to reach 120~\% of the nominal luminosity target, in order to allow for 10~\% loss due to static imperfections, and another 10~\% loss from dynamic imperfections. Various approaches have been considered to correct the magnet misalignments, including 1-1 correction, dispersion free steering (DFS), and several minimization methods utilizing multipole movers. In this paper we report on the recent advancements towards a feasible tuning approach that reach the required luminosity target in a reasonable time frame.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRI012
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPRI052	Design, Fabrication and Tests of the Second Prototype of the Double-Length CLIC PETS	vacuum, alignment, RF-structure, acceleration	3887
	L. Sánchez, J. Calero, D. Gavela, J.L. Gutiérrez, F. Toral CIEMAT, Madrid, Spain D. Gudkov, G. Riddone CERN, Geneva, Switzerland
	Funding: This work has been partially funded by the Spanish Ministry of Economy and Competitiveness under project FPA2010-21456-C02-02 The future collider CLIC is based on a two-beam acceleration scheme, where the drive beam provides to the main beam the RF power through the Power Extraction and Transfer Structures (PETS). The technical feasibility of some components is currently being proved at the CLIC Experimental Area (CLEX). Two double- length CLIC PETS will be installed in CLEX to validate their performance with beam. The first prototype was produced and validated in 2012. This paper is focused on the engineering design, fabrication and validation of the second prototype. Taking into account the results of the first prototype, some modifications have been included in the design to ease fabrication and assembly. The fabrication techniques are very similar to the ones used for the first prototype. Mechanical measurements on single parts and different assembly stages will be reported. The industrialization feasibility will be also analyzed. Finally, several tests such as vacuum tightness and RF measurements with low power have been realized to validate the device. These results are compared with the first prototype ones.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRI052
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPRI087	Magnet Design for the Target System of a Muon Collider/Neutrino Factory	target, factory, proton, solenoid	3976
	R.J. Weggel Particle Beam Lasers, Inc., Northridge, California, USA V.B. Graves ORNL, Oak Ridge, Tennessee, USA H.G. Kirk BNL, Upton, Long Island, New York, USA K.T. McDonald PU, Princeton, New Jersey, USA
	The Target System and Pion Decay Channel for a Muon Collider/Neutrino Factory utilizes a string of solenoid magnet to capture and transport the low-energy pions whose decay provides the desired muon beams. The magnetic field strength at the target is 15-20 T, "tapering" down to 1.5-3 T in the Decay Channel. The superconducting coils which produce these fields must have substantial inner radius to accommodate internal shielding against radiation damage by secondary particles. A significant fraction of the primary beam energy is transported into the Decay Channel via protons, and the Decay Channel includes a magnetic chicane to provide a beam dump for these. The design of the various coils in this scenario is reported.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRI087
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPRI088	Energy Deposition in the Target System of a Muon Collider/Neutrino Factory	target, proton, factory, shielding	3979
	K.T. McDonald PU, Princeton, New Jersey, USA V.B. Graves ORNL, Oak Ridge, Tennessee, USA H.G. Kirk BNL, Upton, Long Island, New York, USA N. Souchlas, R.J. Weggel Particle Beam Lasers, Inc., Northridge, California, USA
	Most of the energy of the primary proton beam of Muon Collider/Neutrino Factory would be deposited in the superconducting coils that provide a solenoid-magnet transport channel for secondary particles, unless those coils are protected by massive internal shielding. Studies are reported of energy deposition in such shielding, with the goal of permitting 10 years operational life at 4-MW beam power. The graphite target should be able to withstand the "thermal shock" induced by the pulsed beam; further study is needed to confirm this.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRI088
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPRI089	Carbon Target Optimization for a Muon Collier/neutrino Factory With a 6.75 GeV Proton Driver	target, proton, factory, solenoid	3982
	X.P. Ding UCLA, Los Angeles, California, USA H.G. Kirk BNL, Upton, Long Island, New York, USA K.T. McDonald PU, Princeton, New Jersey, USA
	The first phase of a Muon Collider/Neutrino Factory program may use a 6.75-GeV proton driver with beam power of only 1 MW. At this lower power it is favorable to use a graphite target (replaced quarterly) with beam and target tilted slightly to the axis of the 15-20 T pion-capture solenoid around the target. The low-energy proton beam is significantly deflected by the magnetic field, requiring careful optimization, reported here, of the beam/target configuration.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRI089
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPRI115	Measuring and Aligning Accelerator Components to the Nanometre Scale	alignment, network, quadrupole, target	4049
	N. Catalán Lasheras, H. Mainaud Durand, M. Modena CERN, Geneva, Switzerland
	First tests have shown that the precision and accuracy required for linear colliders and other future accelerators of 10 micrometers cannot be reached with a process based on independent fiducializations of single components. Indeed, the systematic and random errors at each step add up during the process with the final accuracy of each component center well above the target. A new EC-funded training network named PACMAN (a study on Particle Accelerator Components Metrology and Alignment to the Nanometer scale) will propose and develop an alternative solution integrating all the alignment steps and a large number of technologies at the same time and location, in order to gain the required precision and accuracy. The network composed of seven industrial partners and nine universities and research centers will be based at CERN where ten doctoral students will explore the technology limitations of metrology. They will develop new techniques to measure magnetic and microwave fields, optical and non-contact sensors and survey methods as well as high accuracy mechanics, nano-positioning and vibration sensors.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRI115
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

FRYCA01	Options and Prospects for the Future of Accelerator-based High-energy Physics	coupling, detector, proton, luminosity	4079
	F. Gianotti CERN, Geneva, Switzerland
	Recent results from the LHC and other facilities have significantly impacted the landscape of particle physics. This talk summarises the main outstanding questions in high-energy physics and the strategy to address them. Options for future accelerator facilities and their motivations are discussed.
	Slides FRYCA01 [16.139 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-FRYCA01
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Other Keywords

Page

MOXAA01

Challenges for Highest Energy Circular Colliders

luminosity, radiation, hadron, synchrotron

1

F. Zimmermann, M. Benedikt, D. Schulte, J. Wenninger
CERN, Geneva, Switzerland

A new tunnel of 80-100 km circumference could host a 100 TeV centre-of-mass energy-frontier proton collider (FCC-hh/VHE-LHC), with a circular lepton collider (FCC-ee/TLEP) as potential intermediate step, and a lepton-hadron collider (FCC-he) as additional option. FCC-ee, operating at four different energies for precision physics of the Z, W, and Higgs boson and the top quark, represents a significant push in terms of technology and design parameters. Pertinent R&D efforts include the RF system, top-up injection scheme, optics design for arcs and final focus, effects of beamstrahlung, beam polarization, energy calibration, and power consumption. FCC-hh faces other challenges, such as high-field magnet design, machine protection and effective handling of large synchrotron radiation power in a superconducting machine. All these issues are being addressed by a global FCC collaboration. A parallel design study in China prepares for a similar, but smaller collider, called CepC/SppC.

Slides MOXAA01 [27.493 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOXAA01

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPRO004

Polarized Ion Beams in Figure-8 Rings of JLab's MEIC

polarization, solenoid, controls, ion

68

Y. Filatov
MIPT, Dolgoprudniy, Moscow Region, Russia
Y.S. Derbenev, F. Lin, V.S. Morozov, Y. Zhang
JLab, Newport News, Virginia, USA
Y. Filatov
JINR, Dubna, Russia
A.M. Kondratenko, M.A. Kondratenko
Science and Technique Laboratory Zaryad, Novosibirsk, Russia

Funding: Authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177 and DE-AC02-06CH11357.
The Medium-energy Electron-Ion Collider (MEIC) proposed by Jefferson Lab is designed to provide high polarization of both colliding beams. One of the unique features of JLab’s MEIC is figure-8 shape of its rings. It allows preservation and control of polarization of all ion species including small-anomalous-magnetic-moment deuterons during their acceleration and storage. The figure-8 design conceptually expands the capability of obtaining polarized high-energy beams in comparison to conventional designs because of its property of having no preferred periodic spin direction. This allows one to control effectively the beam polarization by means of magnetic insertions with small field integrals. We present a complete scheme for preserving the ion polarization during all stages of acceleration and its control in the collider’s experimental straights.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPRO004

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPRO005

Progress on the Interaction Region Design and Detector Integration at JLab’s MEIC

detector, electron, ion, focusing

71

V.S. Morozov, P.D. Brindza, A. Camsonne, Y.S. Derbenev, R. Ent, D. Gaskell, F. Lin, P. Nadel-Turonski, M. Ungaro, Y. Zhang, Z.W. Zhao
JLab, Newport News, Virginia, USA
C. Hyde, K. Park
Old Dominion University, Norfolk, Virginia, USA
M.K. Sullivan
SLAC, Menlo Park, California, USA
Z.W. Zhao
UVa, Charlottesville, Virginia, USA

Funding: Authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177 and DE-AC02-06CH11357.
One of the unique features of JLab's Medium-energy Electron-Ion Collider (MEIC) is a full-acceptance detector with a dedicated, small-angle, high-resolution detection system, capable of covering a wide range of momenta (and charge-to-mass ratios) with respect to the original ion beam to enable access to new physics. We present an interaction region design developed with close integration of the detection and beam dynamical aspects. The dynamical aspect of the design rests on a symmetry-based concept for compensation of non-linear effects. The optics and geometry have been optimized to accommodate the detection requirements and to ensure the interaction region's modularity for ease of integration into the collider ring lattices. As a result, the design offers an excellent detector performance combined with the necessary provisions for non-linear dynamical optimization.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPRO005

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPRO006

Preservation of Electron Polarization in the MEIC Collider Ring

polarization, electron, injection, solenoid

74

F. Lin, Y.S. Derbenev, V.S. Morozov, Y. Zhang
JLab, Newport News, Virginia, USA
D.P. Barber
DESY, Hamburg, Germany

Funding: U.S. DOE Contract No. DE-AC05-06OR23177 and DE-AC02-06CH11357.
A highly longitudinally-polarized (over 70%) electron beam is required by the nuclear physics programme of the Medium Energy Electron-Ion Collider (MEIC) at Jefferson Lab (JLab). To achieve this goal, a highly vertically-polarized electron beam is injected from the CEBAF. The polarization will be vertical in the arcs to avoid spin diffusion, and longitudinal at the collision points. The polarization rotation will be accomplished by using a total of four spin rotators, each of which consists of a set of solenoids and dipoles, placed at the ends of two arcs. The polarization configuration cancels the 1st order spin perturbation in the solenoids for the off-momentum particles and significantly reduces the synchrotron sideband resonances. In order to compensate the net Sokolov-Ternov depolarization effect, especially at higher energies, a continuous injection of a polarized electron beam from the CEBAF is being considered. We consider to perform a moderate spin matching in some key regions to extend the polarization lifetime so that the continuous injection can work more efficiently, while not imposing a burden on the optics design of the collider ring.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPRO006

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPRO007

GPU-Accelerated Long-Term Simulations of Beam-Beam Effects in Colliders

GPU, luminosity, simulation, electron

77

B. Terzić, F. Lin, V.S. Morozov, Y. Roblin, H. Zhang
JLab, Newport News, Virginia, USA
M. Aturban, D. Ranjan, M. Zubair
ODU CS, Norfolk, Virginia, USA

Funding: Authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177.
We present an update on the development of the new code for long-term simulation of beam-beam effects in particle colliders. The underlying physical model relies on a matrix-based arbitrary-order particle tracking (including a symplectic option) for beam transport and the generalized Bassetti-Erskine approximation for beam-beam interaction. The computations are accelerated through a parallel implementation on a hybrid GPU/CPU platform. With the new code, previously computationally prohibitive long-term simulations become tractable. The new code will be used to model the proposed Medium-energy Electron-Ion Collider (MEIC) at Jefferson Lab.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPRO007

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPRO045

Beam Delivery Simulation: BDSIM - Development & Optimisation

simulation, lattice, background, detector

182

L.J. Nevay, S.T. Boogert, H. Garcia, S.M. Gibson, R. Kwee-Hinzmann, J. Snuverink
JAI, Egham, Surrey, United Kingdom
L.C. Deacon
UCL, London, United Kingdom

Funding: Research supported by FP7 HiLumi LHC - grant agreement 284404.
Beam Delivery Simulation (BDSIM) is a Geant4 and C++ based particle tracking code that seamlessly tracks particles through accelerators and detectors, including the full range of particle interaction physics processes from Geant4. BDSIM has been successfully used to model beam loss and background conditions for many current and future linear accelerators such as the Accelerator Test Facility 2 (ATF2) and the International Linear Collider (ILC). Current developments extend its application for use with storage rings, in particular for the Large Hadron Collider (LHC) and the High Luminosity upgrade project (HL-LHC). This paper presents the latest results from using BDSIM to model the LHC as well as the developments underway to improve performance.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPRO045

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPME027

Parallel Three-dimensional PIC Code for Beam-beam Simulation in Linear Colliders

simulation, linear-collider, beam-beam-effects, positron

439

M.A. Boronina, V.D. Korneev, V.A. Vshivkov
ICM&MG SB RAS, Novosibirsk, Russia

We present our parallel 3D3V particle-in-cell code for the numerical simulations of ultrarelativistic charged beams in supercolliders. In the algorithm we employ the three-dimensional set of Maxwell equations and the Vlasov-Liouville equation for the distribution function of beam particles in 6-dimensional phase space. The code allows performing numerical experiments with an arbitrary density distribution, beam crossing angle and relative offset. From the mathematical point of view the main problem of the three-dimensional modeling is the presence of the high relativistic factor values (the field gradients are high), the convergence conditions for PIC method and the necessary number of particles in 3D cell. Thus the parallel algorithm is based on the mixed Euler-Lagrangian decomposition in order to achieve good load balancing, and demonstrates the high scalability. With the advances of the code it will be possible to apply it for one-passage beam-beam simulations in linear colliders with supercritical parameters. We present the results of numerical simulations of colliding beams using dummy parameters and parameters close to the ones of the newest ILC project.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPME027

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPME033

Beam Dynamics in an Electron Lens with the Warp Particle-in-cell Code

electron, simulation, gun, solenoid

451

G. Stancari
Fermilab, Batavia, Illinois, USA
V. Moens
EPFL, Lausanne, Switzerland
S. Redaelli
CERN, Geneva, Switzerland

Funding: Fermi Research Alliance, LLC operates Fermilab under Contract DE-AC02-07CH11359 with the US Department of Energy. Research supported in part by US LARP and EU FP7 HiLumi LHC, Grant Agreement 284404.
Electron lenses are a mature technique for beam manipulation in colliders and storage rings. In an electron lens, a pulsed, magnetically confined electron beam with a given current-density profile interacts with the circulating beam to obtain the desired effect. Electron lenses were used in the Fermilab Tevatron collider for beam-beam compensation, for abort-gap clearing, and for halo scraping. They will be used in RHIC at BNL for head-on beam-beam compensation, and their application to the Large Hadron Collider for halo control is under development. At Fermilab, electron lenses will be implemented as lattice elements for nonlinear integrable optics. The design of electron lenses requires tools to calculate the kicks and wakefields experienced by the circulating beam. We use the Warp particle-in-cell code to study generation, transport, and evolution of the electron beam. For the first time, a fully 3-dimensional code is used for this purpose.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPME033

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPME038

Space Charge Simulation in COSY using The Fast Multipole Method

space-charge, emittance, multipole, simulation

460

B.T. Loseth, M. Berz, K. Makino
MSU, East Lansing, Michigan, USA
P. Snopok
Fermilab, Batavia, Illinois, USA
H. Zhang
JLab, Newport News, Virginia, USA

A method is implemented in COSY Infinity that allows the computation of space charge effects of arbitrary and large distributions of particles in an efficient and accurate way based on a variant of the Fast Multipole Method (FMM). It relies on an automatic multigrid-based decomposition of charges in near and far regions and the use of high-order differential algebra methods to obtain decompositions of far fields that lead to an error that scales with a high power of the order. Given an ensemble of N particles, the method allows the computation of the self-fields of all particles on each other with a computational expense that scales as O(N). Furthermore, the method allows the computation of all high-order multipoles of the space charge fields that are necessary for the computation of high-order transfer maps and all resulting aberrations. Space charge effects are crucial in modeling the latter stages of the six-dimensional (6D) cooling channel for the Muon Collider. Results of simulating the 6D cooling channel for the Muon Collider using the FMM method and other tools and improvements implemented for ionization cooling lattices are presented.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPME038

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPME047

Comparison of the Results of a Hydrodynamic Tunneling Experiment with Iterative FLUKA and BIG2 Simulations

target, simulation, proton, experiment

479

F. Burkart, J. Blanco, D. Grenier, R. Schmidt, D. Wollmann
CERN, Geneva, Switzerland
N.A. Tahir
GSI, Darmstadt, Germany

In 2012, a novel experiment has been performed at the CERN HiRadMat facility to study the impact of a 440 GeV proton beam generated by the Super Proton Synchrotron (SPS), on extended solid copper cylindrical targets. Substantial hydrodynamic tunneling of the protons in the target material has been observed. Iterative FLUKA and BIG2 simulations with the parameters of the actual experiment have been performed. In this paper the results of these simulations will be discussed and compared to the experimental measurements. Furthermore, the implication on the machine protection design for high intensity hadron accelerators as the current LHC and the future High Luminosity LHC will be addressed.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPME047

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPME048

CLIC Decelerator - Machine Protection

emittance, quadrupole, alignment, operation

482

L.M. Hein, J. Esberg, M. Jonker
CERN, Geneva, Switzerland

The Compact Linear Collider CLIC is based on a four beam scheme, two colliding beams (main beams) and two drive beams, which are used to accelerate the main beams. The intended drive beam parameters exceed the "safe beam" threshold by a factor of 100. Hence, in case of a beam impact serious structural damages of the accelerator equipment are expected. In order to avoid structural damages caused by the drive beam detailed studies of its beam dynamics are on-going. In this paper the major characteristics of the drive-beam beam-dynamics and preliminary machine protection results are summarised.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPME048

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUOBA01

Electron Lenses for the Large Hadron Collider

electron, collimation, controls, operation

918

G. Stancari, A. Valishev
Fermilab, Batavia, Illinois, USA
R. Bruce, S. Redaelli, A. Rossi, B. Salvachua
CERN, Geneva, Switzerland

Funding: Fermi Research Alliance, LLC operates Fermilab under Contract DE-AC02-07CH11359 with the US Department of Energy. Research supported in part by US LARP and EU FP7 HiLumi LHC, Grant Agreement 284404.
Electron lenses are pulsed, magnetically confined electron beams whose current-density profile is shaped to obtain the desired effect on the circulating beam. Electron lenses were used in the Fermilab Tevatron collider for bunch-by-bunch compensation of long-range beam-beam tune shifts, for removal of uncaptured particles in the abort gap, for preliminary experiments on head-on beam-beam compensation, and for the demonstration of halo scraping with hollow electron beams. Electron lenses for beam-beam compensation are being commissioned in RHIC at BNL. Within the US LHC Accelerator Research Program and the European HiLumi LHC Design Study, hollow electron beam collimation was studied as an option to complement the collimation system for the LHC upgrades. This project is moving towards a technical design in 2014, with the goal to build the devices in 2015-2017, after resuming LHC operations and re-assessing needs and requirements at 6.5 TeV. Because of their electric charge and the absence of materials close to the proton beam, electron lenses may also provide an alternative to wires for long-range beam-beam compensation in LHC luminosity upgrade scenarios with small crossing angles.

Slides TUOBA01 [9.709 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUOBA01

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUOBA03

Recent Beam-beam Effects and Luminosity at VEPP-2000

luminosity, positron, electron, detector

924

D.B. Shwartz, D.E. Berkaev, A.S. Kasaev, I. Koop, A.N. Kyrpotin, A.P. Lysenko, E. Perevedentsev, V.P. Prosvetov, Yu. A. Rogovsky, A.L. Romanov, A.I. Senchenko, P.Yu. Shatunov, Y.M. Shatunov, I.M. Zemlyansky, Yu.M. Zharinov
BINP SB RAS, Novosibirsk, Russia

Funding: Work is supported by the Ministry of Education and Science of the Russian Federation, grant N 14.518.11.7003
VEPP-2000's last season was dedicated to the energy range of 160-520 MeV per beam. The application of round colliding beams concept along with the accurate orbit and lattice correction yielded the high peak luminosity of 1.2*10³¹ cm^-2s⁻¹ at 500 MeV with average luminosity of 0.9*10³¹ cm^-2s⁻¹ per run. The total beam-beam tune shift up to 0.174 was achieved in the runs at 392.5 MeV. This corresponds to beam-beam parameter ksi = 0.125 per one interaction point. The injection system is currently being upgraded to allow for the injection at the top energy of VEPP-2000 collider and to eliminate the present lack of positrons.

Slides TUOBA03 [4.475 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUOBA03

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUOCB01

Concept of a Hybrid (Normal and Superconducting) Bending Magnet Based on Iron Magnetization for 80-100 km Lepton / Hadron Colliders

hadron, dipole, injection, lepton

980

A. Milanese, L. Rossi
CERN, Geneva, Switzerland
H. Piekarz
Fermilab, Batavia, Illinois, USA

This paper presents a conceptual design of bending magnets to be used first in a full energy booster for a lepton machine (TLEP) and later in a low energy ring for a hadron machine (VHE-LHC). TLEP and VHE-LHC would be respectively e-ebar and p-p colliders, at the energy frontier in each category, to be installed in a 80-100 km circumference tunnel. The main requirements in terms of operating field range and field quality are discussed. Two dimensional simulations then show how an iron-dominated magnet could fulfil the specifications. The design is a "transmission-line" magnet, where the excitation current is provided by a single turn. When operating with leptons, a resistive conductor can be used. To then increase the strength needed to handle hadrons, the use of superconducting technology is needed. Recent results on similar prototypes built for different machines are recalled to point to the developments needed to assess the viability of this design.

Slides TUOCB01 [4.225 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUOCB01

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPRO004

Polarized Protons and Deuterons at NICA@JINR

proton, luminosity, polarization, ion

1000

A.D. Kovalenko, A.V. Butenko, V.D. Kekelidze, V.A. Mikhaylov
JINR, Dubna, Moscow Region, Russia
Y. Filatov
MIPT, Dolgoprudniy, Moscow Region, Russia
A.M. Kondratenko, M.A. Kondratenko
Science and Technique Laboratory Zaryad, Novosibirsk, Russia

Different aspects of the NICA facility operation in polarized proton and deuteron modes aimed at reaching the highest possible luminosity and polarization degree as well are analysed. The main aim is to provide average luminosity L ≥ 1•1032 cm^-2 s⁻¹ at √sNN ≥ 26-27 GeV for single-spin proton collisions. Optimal schemes of the Siberian Snake insertions to the Nuclotron and NICA collider rings were proposed. The results of simulations are presented and discussed.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRO004

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPRO005

Status of the NICA Project at JINR

ion, booster, experiment, electron

1003

G.V. Trubnikov, N.N. Agapov, A.V. Butenko, D.E. Donets, E.D. Donets, E.E. Donets, A.V. Eliseev, E.V. Gorbachev, A. Govorov, E.V. Ivanov, V. Karpinsky, V.D. Kekelidze, H.G. Khodzhibagiyan, S.A. Kostromin, A.D. Kovalenko, O.S. Kozlov, V.A. Matveev, I.N. Meshkov, V.A. Mikhailov, V. Monchinsky, N. Shurkhno, A.O. Sidorin, I. Slepnev, V. Slepnev, A.V. Smirnov, A. Sorin, N.D. Topilin, A. Tuzikov, V. Volkov
JINR, Dubna, Moscow Region, Russia
O.I. Brovko, A.V. Philippov, N.V. Semin
JINR/VBLHEP, Moscow, Russia

Nuclotron-based Ion Collider fAcility (NICA) is the new accelerator complex being constructed in Joint Institute for Nuclear Research. General goal of the project is to provide experimental study of hot and dense strongly interacting QCD matter. The development of NICA injection complex is actively performed. Construction of new 3.2 MeV/u heavy-ion linear accelerator (HILac) is now under way in Germany. Construction of booster has been started. In this report the present status of the NICA accelerator complex are presented.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRO005

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPRO009

Simple Models Describing the Time-evolution of Luminosity in Hadron Colliders

luminosity, hadron, proton, operation

1017

M. Giovannozzi
CERN, Geneva, Switzerland

In recent years, several studies have been performed to describe the evolution of the losses in circular proton machines. Considerations based on single-particle, non-linear beam dynamics allowed building models that, albeit simple, proved to be in good agreement with measurements. These initial results have been generalised, thus opening the possibility to describe the luminosity evolution in a circular hadron collider. In this paper, the focus is on the derivation of scaling laws for the integrated luminosity, taking into account both burn off and additional pseudo-diffusive effects. The proposed models are applied to the analysis of the data collected during the LHC Run I and the outcome is discussed in detail.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRO009

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPRO011

New Tools for K-modulation in the LHC

quadrupole, injection, optics, controls

1024

M. Kuhn, B. Dehning, V. Kain, R. Tomás, G. Trad
CERN, Geneva, Switzerland

For many applications, the precise knowledge of the beta function at a given location is essential. Several measurement techniques for optics functions are used in the LHC to provide the most suitable method for a given scenario. A new tool to run k-modulation measurements and analysis is being developed with the aim to be fully automatic and online. It will take constraints of various systems such as tune measurement precision, powering limits of the LHC superconducting circuits and limits of their quench protection systems into account. It will also provide the possibility to sinusoidally modulate the currents of the investigated quadrupoles with a predefined frequency and amplitude to increase the measurement precision further. This paper will review the advantages and limitations of k-modulation measurements in the LHC with and without sinusoidal current modulation. The used algorithms and tools will be presented and estimates on the obtainable beta function measurement precision will be given.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRO011

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPRO026

Possible Beam-beam and Levelling Scenarios for HL-LHC

luminosity, emittance, simulation, hadron

1071

M.P. Crouch, R. Appleby
UMAN, Manchester, United Kingdom
B.D. Muratori
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
T. Pieloni
CERN, Geneva, Switzerland

Funding: Research supported by EU FP7 HiLumi LHC - Grant Agreement 284404
The upgrade of the LHC from the current set-up to high luminosity performances will provide new challenges from the point of view of beam-beam as well as other collective effects and luminosity levelling. We present the current possibilities for doing luminosity levelling for HL-LHC. We explore the merits and drawbacks of each option and briefly discuss the operational implications. The simplest option being levelling with an offset between the two beams. In particular, we look at the possibility of using flat beams in the IPs for all the available options and investigate their benefits and drawbacks, using the code COMBI. Flat beams would allow an additional degree of freedom, with the levelling only required in one of the planes at any given IP. To this end, various scenarios are looked at, both with and without crab cavities.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRO026

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPRO030

Mitigating Radiation Impact on Superconducting Magnets of the Higgs Factory Muon Collider

detector, radiation, dipole, factory

1084

N.V. Mokhov, Y.I. Alexahin, V.V. Kashikhin, S.I. Striganov, I.S. Tropin, A.V. Zlobin
Fermilab, Batavia, Illinois, USA

Funding: Work supported by Fermi Research Alliance, LLC, under contract No. DE-AC02-07CH11359 with the U.S. Department of Energy through the DOE Muon Accelerator Program (MAP).
Recent discovery of a Higgs boson boosted interest in a low-energy medium-luminosity Muon Collider as a Higgs Factory (HF). A preliminary design of the HF storage ring (SR) is based on cos-theta Nb3Sn superconducting (SC) magnets with the coil inner diameter ranging from 50 cm in the interaction region to 16 cm in the arc. The coil cross-sections were chosen based on the operation margin, field quality and quench protection considerations to provide an adequate space for the beam pipe, helium channel and inner absorber (liner). With the 62.5-GeV muon energy and 2×10¹² muons per bunch, the electrons from muon decays deposit about 300 kW in the SC magnets, or unprecedented 1 kW/m dynamic heat load, which corresponds to a multi-MW room temperature equivalent. Based on the detailed MARS15 model built and intense simulations, a sophisticated protection system was designed for the entire SR to bring the peak power density in the SC coils safely below the quench limit and reduce the dynamic heat load to the cold mass by a factor of 100. The system consists of tight tungsten masks in the magnet interconnect regions and elliptical tungsten liners optimized for each magnet.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRO030

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPRO034

Beam-beam Interaction in the Asymmetric Energy Gold-gold Collision in RHIC

simulation, ion, emittance, experiment

1093

Y. Luo, M. Blaskiewicz, M.R. Costanzo, W. Fischer, X. Gu, V.H. Ranjbar, S.M. White
BNL, Upton, Long Island, New York, USA

Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
In this article, we study the beam-beam interaction in the possible future gold-gold collision with different particle energies in the Relativistic Heavy Ion Collider (RHIC). With different particle energies, the center-of-mass of collision is moving in the longitudinal direction during collision. Since the RF harmonic numbers are different for the two RHIC rings, bunches collide in 110 turns followed by 10 turns without collision. In this study, the stability of particles and the beam emittance growth are calculated through numeric simulations based on a 6-D weak-strong beam-beam interaction model.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRO034

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPRO062

Improvements in the Optics Measurement Resolution for the LHC

optics, simulation, dipole, operation

1177

A. Langner, R. Tomás
CERN, Geneva, Switzerland

Optics measurement algorithms which are based on the measurement of beam position monitor (BPM) turn-by-turn data are currently being improved in preparation for the commissioning of the LHC at higher energy. The turn-by-turn data of one BPM may be used more than once, but the implied correlations were not considered in the final error bar. In this paper the error propagation including correlations is studied for the statistical part of the uncertainty. The confidence level of the measurement is investigated analytically and with simulations.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRO062

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPRO069

First Studies of Two-beam Tuning in the CLIC BDS

sextupole, luminosity, linear-collider, simulation

1195

J. Snuverink
JAI, Egham, Surrey, United Kingdom
A. Latina, R. Tomás
CERN, Geneva, Switzerland

Beam tuning in the beam delivery system (BDS) is one of the major challenges for the future linear colliders. Up to now single beam tuning has been performed, both in simulations and experiments at the Accelerator Test Facility (ATF). However, in future linear colliders, due to fast detuning of the final focus optics both beamlines will need to be tuned simultaneously. In this paper a first two-beam tuning study for the Compact Linear Collider (CLIC) BDS is presented applying the usual toolbox of beam-based alignment (BBA) and sextupole knobs.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRO069

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPRO113

Design and Measurement of a Low-energy Tunable Permanent Magnet Quadrupole Prototype

quadrupole, permanent-magnet, linear-collider, magnet-design

1316

B.J.A. Shepherd, J.A. Clarke, P. Wadhwa
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
A. Bartalesi, M. Modena, M. Struik
CERN, Geneva, Switzerland
N.A. Collomb
STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom

The 42 km long CLIC Drive Beam Decelerator (DBD) will decelerate beams of electrons from 2.4 GeV to 240 MeV. ASTeC in collaboration with CERN has developed a novel type of tunable permanent magnet quadrupole for the DBD. Two versions of the design were produced, for the high-energy and low-energy ends of the DBD respectively. This paper outlines the design of the low-energy version, which has a tuning range of 3.5-43 T/m. A prototype was built at Daresbury Laboratory (DL) in 2013, and extensive magnetic measurements were carried out at DL.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRO113

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPME005

CLIC FFS Lattice Proposals Combining Local and Non-local Chromaticity Corrections

lattice, sextupole, linear-collider, interaction-region

1343

O.R. Blanco-García, P. Bambade
LAL, Orsay, France
R. Tomás
CERN, Geneva, Switzerland

The requirements on the Final Focusing System (FFS) for a new linear collider has lead to lattice designs where chromaticity is corrected either locally or non-locally. Here, alternative proposals of lattice design are presented for the current CLIC 500GeV beam parameters, combining the local chromaticity correction on the vertical plane and non-local correction on the horizontal. The tight tolerance on phase advances and beta functions imposed to obtain -I transformation required to cancel the chromatic terms is relaxed by enlarging the system length and using a more general transformation definition, aiming to obtain better results in tuning simulations.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPME005

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPME006

Considerations for a QD0 with Hybrid Technology in ILC

alignment, quadrupole, experiment, luminosity

1346

M. Modena, A.V. Aloev, H. Garcia, L. Gatignon, R. Tomás
CERN, Geneva, Switzerland

The baseline design of the QD0 magnet for ILC, the International Linear Collider, is a very compact superconducting quadrupole (coil-dominated magnet). A prototype of this quadrupole is under construction at Brookhaven National Laboratory (USA). In CLIC, the Compact Linear Collider under study at CERN, we are studying another conceptual solution for the QD0. This is due to two main reasons: all the magnets of the Beam Delivery System will need to be stabilized in the nano-meter range and extremely tight alignment tolerances are required. The proposed solution, now baseline for CLIC, is a room temperature hybrid quadrupole based on electromagnetic coils and permanent magnet blocks (iron-dominated magnet). In this paper we present a conceptual design for a hybrid solution studied and adapted also to the ILC project. A special super-ferric solution is proposed to make the cross section compatible with the experiments layout. This design matches the compactness requirement with the advantages of stability and alignment precision, aspects critical also for ILC in order to achieve the design luminosity. Final Focus optics design considerations for this solution are also presented.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPME006

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPME007

Status of CLIC Magnets Studies and R&D

quadrupole, dipole, status, linear-collider

1350

M. Modena, A.V. Aloev, E. Solodko, P.A. Thonet, A.S. Vorozhtsov
CERN, Geneva, Switzerland

Since 2009 the CERN Magnet Group (CERN-TE-MSC) started R&D activities in order to focalize the most challenging and interesting cases to be studied among the magnets needed for CLIC the Compact Linear Collider. In the last four years several theoretic studies, models and prototypes were realized mainly in two domains: magnets for the Modules, the modular elements that are composing the backbone of the two-beam linac structure of CLIC, and the Machine Detector Interface (MDI) including the Final Focus elements, and the anti-solenoid. In this paper we revise the status for the procured magnets. Among them the Drive Beam Quadrupoles, Main Beam Quadrupoles, Steering Correctors all challenging for the required compactness, performances and production size, and the QD0 final quadrupole and the close SD0 sextupole, challenging for the high performances required in terms of gradients and stability.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPME007

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPME008

Status of the CLIC-UK R&D Programme on Design of Key Systems for the Compact Linear Collider

cavity, feedback, quadrupole, linear-collider

1354

P. Burrows, R. Ainsworth, T. Aumeyr, D.R. Bett, N. Blaskovic Kraljevic, L.M. Bobb, S.T. Boogert, A. Bosco, G.B. Christian, L. Corner, F.J. Cullinan, M.R. Davis, D. Gamba, P. Karataev, K.O. Kruchinin, A. Lyapin, L.J. Nevay, C. Perry, J. Roberts, J. Snuverink, J.R. Towler
JAI, Oxford, United Kingdom
R. Ainsworth, T. Aumeyr, S.T. Boogert, A. Bosco, P. Karataev, K.O. Kruchinin, L.J. Nevay, J.R. Towler
Royal Holloway, University of London, Surrey, United Kingdom
P.K. Ambattu, G. Burt, A.C. Dexter, M. Jenkins, S. Karimian, C. Lingwood, B.J. Woolley
Cockcroft Institute, Lancaster University, Lancaster, United Kingdom
L.M. Bobb, R. Corsini, D. Gamba, A. Grudiev, A. Latina, T. Lefèvre, C. Marrelli, M. Modena, J. Roberts, H. Schmickler, D. Schulte, P.K. Skowroński, J. Snuverink, S. Stapnes, F. Tecker, R. Tomás, R. Wegner, M. Wendt, W. Wuensch
CERN, Geneva, Switzerland
J.A. Clarke, S.P. Jamison, P.A. McIntosh, B.J.A. Shepherd
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
N.A. Collomb, D.G. Stokes
STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom
L. Corner
Oxford University, Physics Department, Oxford, Oxon, United Kingdom
W.A. Gillespie, R. Pan, M.A. Tyrk, D.A. Walsh
University of Dundee, Nethergate, Dundee, Scotland, United Kingdom
R.M. Jones
UMAN, Manchester, United Kingdom

Six UK institutes are engaged in a collaborative R&D programme with CERN aimed at demonstrating key aspects of technology feasibility for the Compact Linear Collider (CLIC). We give an overview and status of the R&D being done on: 1) Drive-beam components: quadrupole magnets and the beam phase feed-forward prototype. 2) Beam instrumentation: stripline and cavity beam position monitors, an electro-optical longitudinal bunch profile monitor, and laserwire and diffraction and transition radiation monitors for transverse beam-size determination. 3) Beam delivery system and machine-detector interface design, including beam feedback/control systems and crab cavity design and control. 4) RF structure design. In each case, where applicable, we report on the status of prototype systems and performance tests with beam at the CTF3, ATF2 and CesrTA test facilities, including plans for future experiments.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPME008

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPME012

The US Muon Accelerator Program

factory, proton, target, linac

1367

M.A. Palmer
Fermilab, Batavia, Illinois, USA

Funding: Work supported by US DOE under contract DE-AC02-07CH11359.
A directed R&D program is presently underway in the U.S. to evaluate the designs and technologies required to provide muon-based high energy physics (HEP) accelerator capabilities. Such capabilities have the potential to provide unique physics reach for the HEP community. An overview of the status of the designs for the neutrino factory and muon collider applications is provided. Recent progress in the technology R&D program is summarized.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPME012

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPME014

Development of Six-dimensional Helical Muon Beam Cooling Channel for Muon Colliders

emittance, solenoid, cavity, magnet-design

1373

K. Yonehara
Fermilab, Batavia, Illinois, USA

A six-dimensional (6D) helical muon beam cooling channel (HCC) has been developed for a last decade. The practical HCC lattice parameters were optimized for the cooling performance in theoretical and numerical simulations. The HCC design group has been formed and has begun the machine development to realize the channel. Recent accomplishments and present critical issues are discussed in the presentation.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPME014

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPME015

Study Cooling Performance in a Helical Cooling Channel for Muon Colliders

emittance, simulation, solenoid, plasma

1376

K. Yonehara
Fermilab, Batavia, Illinois, USA

The cooling performance in a six-dimensional helical muon beam cooling channel (HCC) has been studied in various beam lattice parameters. We show that the HCC works with a practical beam parameter.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPME015

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPME016

Status of the Complete Muon Cooling Channel Design and Simulations

emittance, solenoid, simulation, luminosity

1379

C.Y. Yoshikawa, C.M. Ankenbrandt, R.P. Johnson, S.A. Kahn, F. Marhauser
Muons, Inc, Illinois, USA
Y.I. Alexahin, D.V. Neuffer, K. Yonehara
Fermilab, Batavia, Illinois, USA
Y.S. Derbenev, V.S. Morozov, A.V. Sy
JLab, Newport News, Virginia, USA

Funding: Work supported in part by DOE STTR grant DE-SC 0007634.
Muon colliders could provide the most sensitive measurement of the Higgs mass and return the US back to the Energy Frontier. Central to the capabilities of such muon colliders are the cooling channels that provide the extraordinary reduction in emittance required for the precise Higgs mass measurement and increased luminosity for enhanced discovery potential of an Energy Frontier Machine. We present the status of the design and simulation of a complete muon cooling channel that is based on the Helical Cooling Channel (HCC), which operates via continuous emittance exchange to enable the most efficient design.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPME016

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPME017

Design and Simulation of a Matching System into the Helical Cooling Channel

solenoid, emittance, simulation, operation

1382

C.Y. Yoshikawa
MuPlus, Inc., Newport News, Virginia, USA
Y.I. Alexahin, D.V. Neuffer, K. Yonehara
Fermilab, Batavia, Illinois, USA
C.M. Ankenbrandt, R.P. Johnson, S.A. Kahn, F. Marhauser
Muons, Inc, Illinois, USA
Y.S. Derbenev, V.S. Morozov, A.V. Sy
JLab, Newport News, Virginia, USA

Funding: Work supported in part by DOE STTR grant DE-SC 0007634.
Muon colliders could provide the most sensitive measurement of the Higgs mass and return the US back to the Energy Frontier. Central to the capabilities of muon colliders are the cooling channels that provide the extraordinary reduction in emittance required for the precise Higgs mass measurement and increased luminosity for enhanced discovery potential of an Energy Frontier Machine. The Helical Cooling Channel (HCC) is able to achieve such emittance reduction and matching sections within the HCC have been successfully designed in the past with lossless transmission and no emittance growth. However, matching into the HCC from a straight solenoid poses a challenge, since a large emittance beam must cross transition. We elucidate on the challenge and present evaluations of two solutions, along with concepts to integrate the operations of a Charge Separator and match into the HCC.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPME017

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPME020

Complete Six-dimensional Muon Cooling Channel for a Muon Collider

emittance, lattice, focusing, solenoid

1389

D. Stratakis, J.S. Berg, R.B. Palmer, H. Witte
BNL, Upton, Long Island, New York, USA

Funding: Work supported by Brookhaven Science Associates, LC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
We describe a complete 6D rectilinear cooling scheme for use in a Muon Collider. This scheme uses separate 6D cooling channels for the two signs of particle charge. In each, a channel first reduces the emittance of a train of 21 muon bunches until it becomes possible to merge them into a single bunch, one of each sign. The single bunches are then sent through a second rectilinear channel for further cooling towards the requirements of a Muon Collider. We adopt this approach for a new cooling lattice design for the Muon Collider, and for the first time present a end-to-end simulation. We review key parameters such as the required focusing fields, absorber lengths, cavity frequencies and rf gradients.
*D. Stratakis et al., Phys. Rev. ST AB 16, 091001 (2013).

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPME020

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPME021

Theoretical Framework to Predict Efficiency of Ionization Cooling Lattices

emittance, focusing, lattice, betatron

1392

D. Stratakis
BNL, Upton, Long Island, New York, USA
D.V. Neuffer
Fermilab, Batavia, Illinois, USA

Funding: Work supported by Brookhaven Science Associates, LC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
Reduction of the 6-dimensional phase-space of a muon beam by 6 orders of magnitude is a key requirement for a Muon Collider. Recently, a 12-stage rectilinear ionization cooling channel has been proposed to achieve that goal. In this paper, we establish the mathematical framework to predict and evaluate the cooling performance of the proposed channel. We predict the system effectiveness, by deriving key lattice parameters such as the lattice quality factor which describes the rate of cooling versus the surviving particles and the longitudinal and effective partition numbers for each stage. Main theoretical findings, such as the equilibrium emittances and effective cooling length, are compared against findings from numerical simulations.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPME021

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPRI008

Target System Concept for a Muon Collider/Neutrino Factory

target, proton, factory, solenoid

1568

K.T. McDonald
PU, Princeton, New Jersey, USA
X.P. Ding
UCLA, Los Angeles, California, USA
V.B. Graves
ORNL, Oak Ridge, Tennessee, USA
H.G. Kirk, H. K. Sayed, D. Stratakis
BNL, Upton, Long Island, New York, USA
N. Souchlas, R.J. Weggel
Particle Beam Lasers, Inc., Northridge, California, USA

A concept is presented for a Target System in a staged scenario for a Neutrino Factory and eventual Muon Collider, with emphasis on initial operation with a 6.75 GeV proton beam of 1 MW power, and 50 Hz of pulses 3-ns long. A radiation cooled graphite target will be used in the initial configuration, with an option to replace this with a free-liquid-metal-jet target should 4-MW beam power become available at a later stage.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRI008

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPRI048

A Map Approach for Electron Cloud Density in a Strong LHC Dipole

electron, simulation, dipole, space-charge

1674

S. Petracca, A. Stabile
U. Sannio, Benevento, Italy
A. Stabile
INFN-Salerno, Baronissi, Salerno, Italy

The luminosity is limited by the electron cloud effects in presently running and proposed future storage rings. The evolution of the electron density during the electron cloud formation can be reproduced using a bunch-to-bunch iterative map formalism. By performing simulation codes this approach has been used to obtain a numerical prediction of the coefficients in the map, while in the presence of a magnetic field an analytic formula has been obtained for the linear coefficient. The next goal is finding a theoretical prescription of the quadratic coefficient at least in the presence of magnetic dipole. Then it will be possible to reproduce, by using the map formalism, the dynamics of electron cloud without performing the simulations.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRI048

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPRI088

Active Vibration Isolation System for CLIC Final Focus

controls, linear-collider, ground-motion, luminosity

1775

G. Balik, N. Allemandou, J. Allibe, J.P. Baud, L. Brunetti, G. Deleglise, A. Jeremie, S. Vilalte
IN2P3-LAPP, Annecy-le-Vieux, France
B. Caron, C. Hernandez
SYMME, Annecy-le-Vieux, France

With pinpoint accuracy, the next generation of Linear Collider such as CLIC will collide electron and positron beams at a centre of mass energy of 3 TeV with a desired peak luminosity of 2*1034 cm^-2s⁻¹. One of the many challenging features of CLIC is its ability to collide beams at the sub-nanometer scale at the Interaction Point (IP). Such a high level of accuracy could only be achieved by integrating Active Vibration Isolation system (AVI) upstream the collision to prevent the main source of vibration; Ground Motion (GM). Complementary control systems downstream the collision (Interaction Point FeedBack (IPFB), Orbit FeedBack(OFB)) allow low frequency vibration rejection. This paper focus on a dedicated AVI table designed for the last focusing quadrupole QD0 where the specifications are the most stringent. Combining FeedForward (FF) and FeedBack (FB) techniques, the prototype is able to reduce GM down to 0.6 nm RMS(4Hz) experimentally without load. These performances couldn’t be achieved without cutting edge-technology such as sub-nanometer piezo actuator, ultra-low noise accelerometer and seismometers and an accurate guidance system. The whole AVI system is described in detail.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRI088

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPRI095

Design and Study on a 5 Degree-of-freedom Adjustment Platform for CLIC Drive Beam Quadrupoles

quadrupole, alignment, linear-collider, linac

1796

M. Sosin, M. Anastasopoulos, M. Duquenne, J. Kemppinen, H. Mainaud Durand, V. Rude, J. Sandomierski
CERN, Geneva, Switzerland

Since several years CERN is studying the feasibility of building a high energy e⁺ e⁻ linear collider: the CLIC (Compact LInear Collider). The pre-alignment precision and accuracy requirement for the transverse positions of the linac components is typically 14 micrometers over a sliding window of 200m. One of the challenges is precise adjustment of Drive Beam quadrupole’s magnetic axis. It has to be done with micrometric resolution along 5 DOF in a common support’s coordinate system. This paper describes the design and the study of a solution based on flexural components in a type of “Stewart Platform” configuration. The engineering approach, the lessons learned (“know how”), the issues of adjustment solution and the mechanical components behaviors are presented.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRI095

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPRI116

Engineering Data Management for the ILC Site Specific Design Phase

site, lattice, positron, linear-collider

1839

B. List, L. Hagge, J. Kreutzkamp, N.J. Walker
DESY, Hamburg, Germany

In August 2013, the Japanese ILC Site Evaluation Committee has recommended the Kitakami area in northern Japan as the technically preferred site for the International Linear Collider (ILC) in Japan. With this decision, the ILC planning has moved into a new stage where the Technical Design Report baseline design has to be adapted to the specific site, and refined in preparation for a possible construction project. Engineering data management provides the methods and supporting tools to create and maintain the design data throughout the entire life of the ILC project. The Management and integration of engineering data from the design teams around the globe that contribute to the ILC requires a carefully structured body of documentation, clearly defined processes including configuration control, and efficient vision sharing through 3D modelling.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRI116

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEZA02

A Staged Muon Accelerator Facility for Neutrino and Collider Physics

factory, proton, linac, target

1872

J.-P. Delahaye
SLAC, Menlo Park, California, USA
C.M. Ankenbrandt, S. Brice, A.D. Bross, D.S. Denisov, E. Eichten, S.D. Holmes, R.J. Lipton, D.V. Neuffer, M.A. Palmer
Fermilab, Batavia, Illinois, USA
S.A. Bogacz
JLab, Newport News, Virginia, USA
P. Huber
Virginia Polytechnic Institute and State University, Blacksburg, Virginia, USA
D.M. Kaplan, P. Snopok
Illinois Institute of Technology, Chicago, Illinois, USA
H.G. Kirk, R.B. Palmer
BNL, Upton, Long Island, New York, USA
R.D. Ryne
LBNL, Berkeley, California, USA

Funding: Work supported by the U.S. Dept. of Energy under contracts DE-AC02-07CH11359 and DE-AC02-76SF00515
Muon-based facilities offer unique potential to provide capabilities at both the Intensity Frontier with Neutrino Factories and the Energy Frontier with Muon Colliders. They rely on a novel technology with challenging parameters, for which the feasibility is currently being evaluated by the Muon Accelerator Program (MAP). A realistic scenario for a complementary series of staged facilities with increasing complexity and significant physics potential at each stage has been developed. It takes advantage of and leverages the capabilities already planned for Fermilab, especially the strategy for long-term improvement of the accelerator complex being initiated with the Proton Improvement Plan (PIP-II) and the Long Baseline Neutrino Facility (LBNF). Each stage is designed to provide an R&D platform to validate the technologies required for subsequent stages. The rationale and sequence of the staging process and the critical issues to be addressed at each stage, are presented.

Slides WEZA02 [27.263 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEZA02

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEOCA03

DAΦNE Operation with the Upgraded KLOE-2 Detector

luminosity, detector, operation, coupling

1883

C. Milardi, D. Alesini, M.E. Biagini, M. Boscolo, B. Buonomo, S. Cantarella, A. De Santis, G.O. Delle Monache, G. Di Pirro, A. Drago, L.G. Foggetta, O. Frasciello, A. Gallo, A. Ghigo, F. Guatieri, S. Guiducci, F. Iungo, C. Ligi, G. Mazzitelli, L. Pellegrino, R. Ricci, U. Rotundo, C. Sanelli, G. Sensolini, M. Serio, A. Stecchi, A. Stella, M. Zobov
INFN/LNF, Frascati (Roma), Italy
R. Gargana, A. Michelotti
Consorzio Laboratorio Nicola Cabibbo, Frascati, Italy
D.N. Shatilov
BINP SB RAS, Novosibirsk, Russia
M. Tobiyama
KEK, Ibaraki, Japan
A. Valishev
Fermilab, Batavia, Illinois, USA

The DAΦNE collider has been successfully commissioned after the experimental detector modification and a major upgrade and consolidation program involving a large part of the accelerator complex. This paper presents the Φ-Factory setup and the achieved performances in terms of beam currents, luminosity, detector background and related aspects.

Slides WEOCA03 [2.424 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEOCA03

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEIB05

Big Science Projects - What is it that makes some a success and others to fail?

factory, plasma, operation, heavy-ion

4099

J.H. Yeck
ESS, Lund, Sweden

This presentation analyses the driving forces behind big science projects (which are very different compared to similarly complex but totally commercial projects). This presentation should be enlightening and a big help for anyone wanting to make business with big science projects.

Slides WEIB05 [3.312 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEIB05

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPME057

The Secondary Electron Yield from Transition Metals

electron, vacuum, gun, hadron

2403

S. Wang, M.D. Cropper
Loughborough University, Loughborough, Leicestershire, United Kingdom
O.B. Malyshev, E.A. Seddon, R. Valizadeh, S. Wang
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom

Non-evaporable getter thin films, which are currently being used in the ultra-high vacuum system of the Large Hadron Collider, normally consist of Ti, Zr and V, deposited by physical vapour deposition. In this study, the secondary electron yield (SEY) of bulk Ti, Zr, V and Hf have been investigated as a function of electron conditioning. The maximum SEYs of as-received Ti, Zr, V and Hf, are respectively 1.96, 2.34, 1.72 and 2.32, these reduce to 1.14, 1.13, 1.44 and 1.18 after electron conditioning. Surface chemical composition was studied by X-ray photoelectron spectroscopy which revealed that surface conditioning by electron bombardment promotes the growth of a thin carbon layer on the surface and consequently reduces the SEY of the surface as a function of electron dose. Heating a vanadium sample to 250°C resulted in diffusion of oxygen into the bulk and induced formation of metal carbide at the surface. However, the SEY stays the same even after heat-induced surface chemistry modification. Prolonged electron conditioning increases the surface oxygen but the surface is still predominantly covered with a thin graphitic layer and hence the SEY stays approximately constant.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPME057

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPRI088

Magnetic Measurement System for the NICA Booster Magnets

dipole, booster, controls, LabView

2696

V.V. Borisov, A. Donyagin, O. Golubitsky, A. Golunov, N. Gorbunov, H.G. Khodzhibagiyan, N.A. Morozov, S. Rubtsun
JINR, Dubna, Moscow Region, Russia

NICA is a new accelerator collider complex presently under construction at Joint Institute for Nuclear Research (JINR) in Dubna. More than 250 superconducting magnets need for the NICA booster and collider. These magnets will be assembled and tested at the new test facility in the Laboratory of High Energy Physics JINR. The first phase of the system for magnetic measurements was commissioned in late 2013. A method of measuring the quality of the magnetic field in the aperture of the curved dipole magnet for the booster synchrotron is described. First results of magnetic measurements are presented and discussed. Commissioning of equipment for magnetic measurements in the aperture of quadrupole magnets for the NICA booster is close to completion.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPRI088

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPRI089

Facility for Assembling and Serial Test of Superconducting Magnets

booster, quadrupole, dipole, synchrotron

2700

S.A. Kostromin, N.N. Agapov, V.V. Borisov, A.R. Galimov, V. Karpinsky, H.G. Khodzhibagiyan, V.S. Korolev, D. Nikiforov, N.V. Semin, A.Y. Starikov, G.V. Trubnikov
JINR, Dubna, Moscow Region, Russia

The NICA/MPD project has been started at the Joint Institute for Nuclear Research (JINR) in Dubna in 2007. The NICA accelerator complex will consist of two injector chains, the new 600 MeV/u superconducting (SC) booster synchrotron, the existing SC synchrotron Nuclotron, and the new SC collider having two rings each of 503 m in circumference. The building construction of the new test facility for simultaneous cryogenic testing of the SC magnets on 6 benches is completed at the Laboratory of High Energy Physics. Premises with an area of 2600 m2 were prepared to install the equipment. The 15 kA, 25 V pulse power supply, the helium satellite refrigerator with capacity of 100 W were commissioned first bench for magnets testing is now under assembling. First magnets cryogenic tests are planned on July. Start of the serial production of the SC magnets for the booster synchrotron is planned for the end of 2014.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPRI089

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPRI103

Magnet Design for a Six-dimensional Rectilinear Cooling Channel - Feasibility Study

solenoid, dipole, simulation, emittance

2740

H. Witte, J.S. Berg, R.B. Palmer, D. Stratakis
BNL, Upton, Long Island, New York, USA
F. Borgnolutti
LBNL, Berkeley, California, USA

Funding: Work supported by Brookhaven Science Associates, LC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
An essential part of a potential future muon collider is ionization cooling, which is required to reduce the emittance of the muon beam. A new scheme has recently been proposed which in simulations shows an improved performance in terms of cooling efficiency and transmitted muons. The lattice of this cooling channel consists of 12 stages, each of which requires different superconducting solenoids. The most challenging stage is the last one, where the solenoids are expected to deliver 15.1T in a bore of ~4.5 cm. This paper discusses the feasibility of the solenoids for the last stage of this lattice.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPRI103

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPRI108

Liquid Helium Technologies at Cryogenic Complex of the Heavy Ion Collider NICA

cryogenics, superconducting-magnet, booster, ion

2752

Iu.A. Mitrofanova, N.N. Agapov, N. Emelianov, H.G. Khodzhibagiyan, D. Nikiforov
JINR, Dubna, Moscow Region, Russia
R. Herzog, A. Kade, J. Klier
ILK Dresden, Dresden, Germany

NICA (Nuclotron-based Ion Collider fAcility), presently under construction at JINR, will be, upon its completion, among the most advanced research instruments of the physics community. The facility is aimed at providing collider experiments with heavy ions up to uranium (gold at the beginning stage) with a centre of mass energy up to 11 GeV/u and an average luminosity up to 10²⁷ cm^-2 s⁻¹. The NICA cryogenics includes a large number of technical ideas and solutions never used before. The most significant of these solutions are the fast cycling superconducting magnets, cooling by the two-phase helium flow, an unusually short period of time for cool down till the operating temperature, parallel connection of cooling channels of the magnets, «wet» turbo expanders, screw compressors with the outlet pressure of more than 25 bars and jet pumps for liquid helium. These technical solutions allow one to construct an efficient and reliable cryogenic system of the NICA complex.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPRI108

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPPA02

Gersch Budker Prize Presentation

klystron, linear-collider, electron, FEL

2846

T. Shintake
OIST, Onna-son, Okinawa, Japan

SACLA: SPring-8 Angstrom Compact free-electron Laser, previously called XFEL/SPring-8, which is based on electron accelerator technology developed at SCSS project, in which C-band high gradient linear accelerator provides stable driving beams. Looking back upon 20 years R&D on C-band accelerator, I would like to give some advises to young scientists on doing research. The developed C-band accelerator is now providing 8 GeV electron beams at SACLA X-ray FEL in daily operation with the world best energy stability among these large scale machines.

Slides THPPA02 [17.649 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPPA02

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPRO028

Bunch Compressor Design for CLIC Drive Beam

gun, linac, cathode, linear-collider

2924

A.A. Aksoy
Ankara University, Accelerator Technologies Institute, Golbasi / Ankara, Turkey
J. Esberg, D. Schulte
CERN, Geneva, Switzerland

The drive-beam linac which is required for generation RF power at Compact Linear Collider (CLIC) has to accelerate an electron beam with 8.4 nC per bunch up to 2.4 GeV in almost fully loaded structures. The required beam stability in both transverse and longitudinal directions are of concern for such a high bunch charge. We present different bunch compressor designs for the Drive Beam and compare their performance including the effects beam energy and phase jitters.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRO028

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPME054

RF Cavity Design Aspects for a Helical Muon Beam Cooling Channel

cavity, Windows, embedded, factory

3352

F. Marhauser, G. Flanagan, R.P. Johnson, S.A. Kahn
Muons, Inc, Illinois, USA
K. Yonehara
Fermilab, Batavia, Illinois, USA

Funding: Work supported under U.S. DOE Grant Application Number DE-SC0006266
A Helical Cooling Channel (HCC) promises efficient six-dimensional ionization cooling of muon beams by utilizing high-pressurized gas as a continuous absorber within a magnetic channel embedding RF cavities. The progress on cavity design, tailored for such a cooling channel, is discussed.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME054

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPME153

The New Optical Device for Turn-to-turn Beam Profile Measurement

electron, storage-ring, synchrotron, positron

3617

O.I. Meshkov, V.L. Dorohov, A.A. Ivanova, A.D. Khilchenko, A.I. Kotelnikov, A.N. Kvashnin, P.V. Zubarev
BINP SB RAS, Novosibirsk, Russia
S.V. Ivanenko, E.A. Puryga
Budker Institute of Nuclear Physics, Novosibirsk, Russia
V. Korchuganov
RRC, Moscow, Russia
Stirin, A.I. Stirin
NRC, Moscow, Russia

The linear avalanche photodiodes array is applied for turn-to-turn beam profile measurement at Siberia-2 synchrotron light source. The apparatus is able to record a transversal profile of selected bunch and analyze the dynamics of beam during 2²⁰ turns. The first experience with application of new diagnostics for routine use at the installation is described.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME153

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPME155

Beam Phase Space Reconstruction for Monitoring the Luminosity in the VEPP-2000 Collider

electron, luminosity, positron, lattice

3623

A.L. Romanov, I. Koop, E. Perevedentsev, D.B. Shwartz
BINP SB RAS, Novosibirsk, Russia

16 synchrotron light imaging monitors available in VEPP-2000 can be used for evaluation of dynamic betas and emittances at collision. Tomographic techniques are useful for reconstruction of non-gaussian beam phase space at the IPs at high intensities of colliding bunches. The output is applied for prompt luminosity monitoring.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME155

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPRI003

Beam-beam Simulation Study for CEPC

simulation, luminosity, dynamic-aperture, damping

3763

Y. Zhang
IHEP, Beijing, People's Republic of China
K. Ohmi, D. Zhou
KEK, Ibaraki, Japan
D.N. Shatilov
BINP SB RAS, Novosibirsk, Russia

CEPC is an Circular Electron Positron Collider proposed to carry out high precision study on Higgs bosons. It is similar to TLEP project , the luminosity and beam lifetime may be determined by the beamstrahlung effect. We try to check the resonability of the machine parameters with weak-strong and strong-strong simulation. At the same time we also do some cross-check between different codes. We wish the work could help determine the beam parameters which could achieve design luminosity.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRI003

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPRI004

FCC-ee/CepC Beam-beam Simulations with Beamstrahlung

simulation, luminosity, radiation, photon

3766

K. Ohmi
KEK, Ibaraki, Japan
F. Zimmermann
CERN, Geneva, Switzerland

Beamstrahlung, namely synchrotron radiation emitted during the beam-beam collision, can be an important effect for circular high-energy lepton colliders such as FCC-ee (TLEP). In this paper we study beam-beam effects in the presence of energy spreading and bunch lengthening due to beamstrahlung.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRI004

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPRI007

Lattice Optimization of BEPCII Collider Rings

lattice, luminosity, simulation, sextupole

3776

Y. Zhang, Q. Qin, C.H. Yu
IHEP, Beijing, People's Republic of China

BEPCII is a double ring e⁺e⁻ collider operating in the tau-charm region. In March 2013, the peak luminosity achieves 7.0·10³² cm^-2s^-1 with a new lower alphap lattice. The beam-beam parameter is also increased from 0.033 to 0.04 with the new lattice. In this paper we'll review the lattice optimization history briefly and focus on the optimization of the lower alphap lattice.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRI007

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPRI008

Interaction Region Lattice for FCC-ee (TLEP)

quadrupole, lattice, dynamic-aperture, luminosity

3779

A.V. Bogomyagkov, E.B. Levichev, P.A. Piminov
BINP SB RAS, Novosibirsk, Russia

Funding: The work is supported by the Ministry of Education and Science of the Russian Federation.
FCC-ee (TLEP)* project is a high-luminosity e⁺e^- collider and is an essential part of the Future Circular Collider (FCC) design study at CERN . FCC-ee is being designed to reach center-of-mass energy from 90 to 350 GeV with circumference of 80-100 km to study Higgs boson properties and perform precise measurements at the electroweak scale. It is also an intermediate step towards 100 TeV proton-proton collider built in the same tunnel. Some of the limiting factors of the new collider are total energy loss due to synchrotron radiation, beam lifetime degradation owing to beamstrahlung, geometry of the tunnel required to accommodate the successor. The present paper describes linear lattice of interaction region and results of nonlinear beam dynamics study.
* M.~Koratzinos et al., ‘‘TLEP: A HIGH-PERFORMANCE CIRCULAR e⁺e⁻ COLLIDER TO STUDY THE HIGGS BOSON'', IPAC2013, Shanghai, China, TUPME040 (2013)

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRI008

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPRI010

FCC-ee Final Focus with Chromaticity Correction

dynamic-aperture, optics, sextupole, lattice

3782

H. Garcia, R. Tomás, R. Tomás
CERN, Geneva, Switzerland

A 100 km circular electron-positron collider is considered as one of the possible future high energy facilities. In order to achieve a high luminosity, strong beam focusing at the Interaction Point is used requiring the correction of the chromatic aberrations. In this paper we study preliminary designs of a Final Focus System for the TLEP collider with chromatic correction. Beam orbit stability and dynamic aperture calculations are also presented.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRI010

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPRI011

Beam-machine Interaction at TLEP: First Evaluation and Mitigation of the Synchrotron Radiation Impact

dipole, synchrotron, synchrotron-radiation, radiation

3785

L. Lari, F. Cerutti, A. Ferrari, A. Mereghetti
CERN, Geneva, Switzerland
L. Lari
IFIC, Valencia, Spain
A. Mereghetti
UMAN, Manchester, United Kingdom

In the framework of post-LHC accelerator studies, TLEP is a proposed high-luminosity circular e⁺e⁻ collider, aimed at measuring the properties of the Higgs-boson H(126) with unprecedented accuracy, as well as those of the W boson, the Z boson and the top quark. In order to calculate the impact of synchrotron radiation, the latter has been implemented in the FLUKA code as new source term. A first account of escaping power as a function of the vacuum chamber shielding thickness, photoneutron production, and activation has been obtained for the 80km circumference 175 GeV (beam energy) TLEP option. Starting from a preliminary layout of the FODO cell and a possible dipole design, energy deposition simulations have been carried out, investigating the effectiveness of absorbers in the interconnections. The results provide inputs to improve the cell design and to support mechanical integration studies.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRI011

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPRI012

Tuning of the Compact Linear Collider Beam Delivery System

luminosity, simulation, linear-collider, multipole

3788

Y.I. Levinsen, G. Giambelli, A. Latina, R. Tomás
CERN, Geneva, Switzerland
H. Garcia
UPC, Barcelona, Spain
J. Snuverink
JAI, Egham, Surrey, United Kingdom

Tuning the CLIC Beam Delivery System (BDS), and in particular the final focus, is a challenging task. In simulations without misalignments, the goal is to reach 120~\% of the nominal luminosity target, in order to allow for 10~\% loss due to static imperfections, and another 10~\% loss from dynamic imperfections. Various approaches have been considered to correct the magnet misalignments, including 1-1 correction, dispersion free steering (DFS), and several minimization methods utilizing multipole movers. In this paper we report on the recent advancements towards a feasible tuning approach that reach the required luminosity target in a reasonable time frame.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRI012

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPRI052

Design, Fabrication and Tests of the Second Prototype of the Double-Length CLIC PETS

vacuum, alignment, RF-structure, acceleration

3887

L. Sánchez, J. Calero, D. Gavela, J.L. Gutiérrez, F. Toral
CIEMAT, Madrid, Spain
D. Gudkov, G. Riddone
CERN, Geneva, Switzerland

Funding: This work has been partially funded by the Spanish Ministry of Economy and Competitiveness under project FPA2010-21456-C02-02
The future collider CLIC is based on a two-beam acceleration scheme, where the drive beam provides to the main beam the RF power through the Power Extraction and Transfer Structures (PETS). The technical feasibility of some components is currently being proved at the CLIC Experimental Area (CLEX). Two double- length CLIC PETS will be installed in CLEX to validate their performance with beam. The first prototype was produced and validated in 2012. This paper is focused on the engineering design, fabrication and validation of the second prototype. Taking into account the results of the first prototype, some modifications have been included in the design to ease fabrication and assembly. The fabrication techniques are very similar to the ones used for the first prototype. Mechanical measurements on single parts and different assembly stages will be reported. The industrialization feasibility will be also analyzed. Finally, several tests such as vacuum tightness and RF measurements with low power have been realized to validate the device. These results are compared with the first prototype ones.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRI052

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPRI087

Magnet Design for the Target System of a Muon Collider/Neutrino Factory

target, factory, proton, solenoid

3976

R.J. Weggel
Particle Beam Lasers, Inc., Northridge, California, USA
V.B. Graves
ORNL, Oak Ridge, Tennessee, USA
H.G. Kirk
BNL, Upton, Long Island, New York, USA
K.T. McDonald
PU, Princeton, New Jersey, USA

The Target System and Pion Decay Channel for a Muon Collider/Neutrino Factory utilizes a string of solenoid magnet to capture and transport the low-energy pions whose decay provides the desired muon beams. The magnetic field strength at the target is 15-20 T, "tapering" down to 1.5-3 T in the Decay Channel. The superconducting coils which produce these fields must have substantial inner radius to accommodate internal shielding against radiation damage by secondary particles. A significant fraction of the primary beam energy is transported into the Decay Channel via protons, and the Decay Channel includes a magnetic chicane to provide a beam dump for these. The design of the various coils in this scenario is reported.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRI087

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPRI088

Energy Deposition in the Target System of a Muon Collider/Neutrino Factory

target, proton, factory, shielding

3979

K.T. McDonald
PU, Princeton, New Jersey, USA
V.B. Graves
ORNL, Oak Ridge, Tennessee, USA
H.G. Kirk
BNL, Upton, Long Island, New York, USA
N. Souchlas, R.J. Weggel
Particle Beam Lasers, Inc., Northridge, California, USA

Most of the energy of the primary proton beam of Muon Collider/Neutrino Factory would be deposited in the superconducting coils that provide a solenoid-magnet transport channel for secondary particles, unless those coils are protected by massive internal shielding. Studies are reported of energy deposition in such shielding, with the goal of permitting 10 years operational life at 4-MW beam power. The graphite target should be able to withstand the "thermal shock" induced by the pulsed beam; further study is needed to confirm this.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRI088

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPRI089

Carbon Target Optimization for a Muon Collier/neutrino Factory With a 6.75 GeV Proton Driver

target, proton, factory, solenoid

3982

X.P. Ding
UCLA, Los Angeles, California, USA
H.G. Kirk
BNL, Upton, Long Island, New York, USA
K.T. McDonald
PU, Princeton, New Jersey, USA

The first phase of a Muon Collider/Neutrino Factory program may use a 6.75-GeV proton driver with beam power of only 1 MW. At this lower power it is favorable to use a graphite target (replaced quarterly) with beam and target tilted slightly to the axis of the 15-20 T pion-capture solenoid around the target. The low-energy proton beam is significantly deflected by the magnetic field, requiring careful optimization, reported here, of the beam/target configuration.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRI089

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPRI115

Measuring and Aligning Accelerator Components to the Nanometre Scale

alignment, network, quadrupole, target

4049

N. Catalán Lasheras, H. Mainaud Durand, M. Modena
CERN, Geneva, Switzerland

First tests have shown that the precision and accuracy required for linear colliders and other future accelerators of 10 micrometers cannot be reached with a process based on independent fiducializations of single components. Indeed, the systematic and random errors at each step add up during the process with the final accuracy of each component center well above the target. A new EC-funded training network named PACMAN (a study on Particle Accelerator Components Metrology and Alignment to the Nanometer scale) will propose and develop an alternative solution integrating all the alignment steps and a large number of technologies at the same time and location, in order to gain the required precision and accuracy. The network composed of seven industrial partners and nine universities and research centers will be based at CERN where ten doctoral students will explore the technology limitations of metrology. They will develop new techniques to measure magnetic and microwave fields, optical and non-contact sensors and survey methods as well as high accuracy mechanics, nano-positioning and vibration sensors.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRI115

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

FRYCA01

Options and Prospects for the Future of Accelerator-based High-energy Physics

coupling, detector, proton, luminosity

4079

F. Gianotti
CERN, Geneva, Switzerland

Recent results from the LHC and other facilities have significantly impacted the landscape of particle physics. This talk summarises the main outstanding questions in high-energy physics and the strategy to address them. Options for future accelerator facilities and their motivations are discussed.

Slides FRYCA01 [16.139 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-FRYCA01

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)