IPAC2014 - List of Keywords (factory)

Paper	Title	Other Keywords	Page
MOPRO071	Wake Field and Impedance Calculation due to the Beam Position Monitor in the ILSF Storage Ring	impedance, vacuum, wakefield, storage-ring	246
	H. Ghasem IPM, Tehran, Iran M. Razazian ILSF, Tehran, Iran
	The Beam Position Monitors (BPMs) are usually used in the particles accelerators to observe position of the beam and to record longitudinal bunch shape. As the vertical beam size demands beam stabilities on the submicron level in the particle accelerators, there must be a sever precision on designing and fabrication of the BPMs. In this paper, we have explored effect of the BPMs on the total impedance and loss factor of the ILSF storage ring.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPRO071
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPME026	IBS Simulations with Compute Unified Device Architecture (CUDA) Technology	scattering, simulation, GPU, electron	436
	S.A. Glukhov, E.B. Levichev, S.A. Nikitin, P.A. Piminov, D.N. Shatilov, S.V. Sinyatkin BINP SB RAS, Novosibirsk, Russia
	A program code for 6D tracking has been developed taking into account IBS (Intra-Beam Scattering) and Touschek effect and using Monte-Carlo method. The simulation algorithm has been developed on the basis of well-known IBS theory presented in (). The resulting program can be executed using GPGPU devices (General-Purpose Graphics Processing Units) supporting CUDA technology (Compute Unified Device Architecture). J. Le Duff, Single and multiple Touschek effects // Published in In Rhodos 1993, Advanced accelerator physics, vol. 2 573-586. CERN Geneva - CERN-95-06 (95/11,rec. Mar.96) 1993. p. 573-586.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPME026
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPRI007	Design and Simulation of a High Intensity Muon Beam Production for Neutrino Experiments.	target, proton, solenoid, emittance	589
	H. K. Sayed, H.G. Kirk, R.B. Palmer, D. Stratakis BNL, Upton, Long Island, New York, USA K.T. McDonald PU, Princeton, New Jersey, USA D.V. Neuffer Fermilab, Batavia, Illinois, USA
	The production process of pions which then decay into muons, yields a muon beam with large transverse and longitudinal emittances. Such beam requires phase space manipulation to reduce the total 6D emittance before it could go through any acceleration stage. The design of the muon beam manipulation is based on Neutrino Factory front end design. In this study we report on a multi objective - multivariable global optimization of the front end using parallel genetic algorithm. The parallel optimization algorithm and the optimization strategy will be discussed and the optimized results will be presented as well.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPRI007
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUOAB01	Computation of Eigenmodes in Long and Complex Accelerating Structures by Means of Concatenation Strategies	cavity, HOM, coupling, FEL	947
	T. Flisgen, J. Heller, U. van Rienen Rostock University, Faculty of Computer Science and Electrical Engineering, Rostock, Germany
	Funding: This research was partially funded by the EuCARD project which is co-funded by European Commission 7th in Framework Programme (FP7). The computation of eigenmodes for complex accelerating structures is a challenging and important task for the design and operation of particle accelerators. Discretizing long and complex structures to determine its eigenmodes leads to demanding computations typically performed on super computers. This contribution presents an application example of a method to compute eigenmodes and other parameters derived from these eigenmodes for long and complex structures using standard workstation computers. This is accomplished by the decomposition of the complex structure into several single segments. In a next step, the electromagnetic properties of the segments are described in terms of a compact state space model. Subsequently, the state space models of the single structures are concatenated to the full structure. The results of direct calculations are compared with results obtained by the concatenation scheme in terms of computational time and accuracy.
	Slides TUOAB01 [1.781 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUOAB01
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	collider, detector, radiation, dipole	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)

TUPRO073	RFFAG Decay Ring for nuSTORM	proton, injection, detector, target	1208
	J.-B. Lagrange, J. Pasternak Imperial College of Science and Technology, Department of Physics, London, United Kingdom R. Appleby, J.M. Garland, H.L. Owen, S.C. Tygier UMAN, Manchester, United Kingdom Y. Mori Kyoto University, Research Reactor Institute, Osaka, Japan
	The nuSTORM facility aims to deliver neutrino beams produced from the decay of muons stored in a racetrack ring. Design of racetrack FFAG (Fixed Field Alternating Gradient) decay ring for nuSTORM project is presented in this paper.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRO073
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPME010	The Physics Programme of next MICE Step IV	emittance, scattering, experiment, simulation	1361
	J.C. Nugent University of Glasgow, Glasgow, United Kingdom V.C. Palladino INFN-Napoli, Napoli, Italy
	Funding: DOE, NSF, STFC, INFN, CHIPP and several others The International Muon Ionization Cooling Experiment is progressing towards a full demonstration of the feasibility of ionization cooling technology decisive for neutrino physics and muon colliders. Step IV should provide the first precise measurements of emittances and first evidence of cooling. The components required for Step IV, including spectrometer solenoids, muon trackers and absorber-FC (focus coil) modules have been assembled with data collection expected in 2015. The physics programme of this Step will be described in detail, with LiH and a few other promising absorber materials of different shapes. Abstract presented by the chair of the speaker bureau of the MICE collaboration, that would next select a MICE member to prepare and present the poster
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPME010
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPME012	The US Muon Accelerator Program	collider, 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)

TUPME022	Design and Optimization of a Particle Selection System for Muon based Accelerators	proton, solenoid, target, simulation	1395
	D. Stratakis, J.S. Berg BNL, Upton, Long Island, New York, USA D.V. Neuffer Fermilab, Batavia, Illinois, USA P. Snopok Illinois Institute of Technology, Chicago, Illinois, USA
	Funding: Work supported by Brookhaven Science Associates, LC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy. In Muon Accelerators muons are produced by impacting high energy protons onto a target to produce pions. The pions decay to muons which are then accelerated. Through this process a significant background of protons and electrons are generated, which may result in heat deposition on superconducting materials and activation of the machine. In this paper we propose a two-step particle selection scheme: a chicane to remove the high momentum particles from the beam and a Beryllium block absorber that reduces momentum of all particles in the beam, resulting in the loss of low momentum protons. We review the design and numerically examine its impact on the performance of the muon front-end.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPME022
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPRI002	The EUROnu Study for Future High Power Neutrino Oscillation Facilities	target, detector, proton, linac	1553
	T.R. Edgecock STFC/RAL, Chilton, Didcot, Oxon, United Kingdom
	The EUROnu project was a 4 year FP7 design study to investigate and compare three possible options for future, high power neutrino oscillation facilities in Europe. These three facilities are a Neutrino Factory, a neutrino superbeam from CERN to the Frejus Laboratory and a so-called Beta Beam. The study was completed at the end of 2012 and has produced conceptual designs for the facilities and preliminary cost estimates. The designs were used to determine the physics performance. These have been used to compare the facilities. This paper will describe the designs, physics performance and costs and summarise the recommendations of the study.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRI002
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, collider, 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)

TUPRI013	Dynamic Aperture Studies of the nuSTORM FFAG Ring	lattice, dynamic-aperture, closed-orbit, detector	1574
	R. Appleby, J.M. Garland, H.L. Owen, S.C. Tygier UMAN, Manchester, United Kingdom K.M. Hock Cockcroft Institute, Warrington, Cheshire, United Kingdom J.-B. Lagrange, J. Pasternak Imperial College of Science and Technology, Department of Physics, London, United Kingdom
	Funding: Research supported by STFC grant number ST/K002503/1 "Racetrack FFAGs for medical, PRISM and energy applications". FFAG rings with a racetrack configuration are very promising as their flexible design allow for dedicated spaces for injection/extraction, RF cavities etc. A racetrack FFAG is considered as an option for the nuSTORM facility, which aims to deliver neutrino beams produced from the decay of muons stored in a ring with long sections pointing towards detectors. In this paper we discuss the definition of dynamic aperture in these machines and use the PyZgoubi framework to compute the many turn motion in the nuSTORM ring. The roles of machine imperfections and symmetry are discussed.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRI013
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPRI049	Geometric Beam Coupling Impedance of LHC Secondary Collimators	impedance, simulation, HOM, wakefield	1677
	O. Frasciello, S. Tomassini, M. Zobov INFN/LNF, Frascati (Roma), Italy A. Grudiev, N. Mounet, B. Salvant CERN, Geneva, Switzerland
	Funding: Work supported by European Commission within the Framework Programme 7 Capacities Specific Programme, Grant Agreement 284404 The High Luminosity LHC project is aimed at increasing the LHC luminosity by an order of magnitude. One of the key ingredients to achieve the luminosity goal is the beam intensity increase. In order to keep under control beam instabilities and to avoid excessive power losses a careful design of new vacuum chamber components and an improvement of the present LHC impedance model are required. Collimators are the main impedance contributors. Measurements with beam have revealed that the betatron coherent tune shifts were by about a factor of 2 higher with respect to the theoretical predictions based on the current model. Up to now the resistive wall impedance has been considered as the major impedance contribution for collimators. By carefully simulating their geometric impedance we show that for the graphite collimators with half-gaps higher than 10 mm the geometric impedance exceeds the resistive wall one. In turn, for the tungsten collimators the geometric impedance dominates for all used gap values. Hence, including the geometric collimator impedance into the LHC impedance model enabled us to reach a better agreement between the measured and simulated collimator tune shifts.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRI049
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEZA02	A Staged Muon Accelerator Facility for Neutrino and Collider Physics	collider, 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)

WEIB05	Big Science Projects - What is it that makes some a success and others to fail?	collider, 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)

WEPME004	Prediction of Severe Electron Loading of High-gradient Accelerating Structures based on Field Emission Measurements of Nb and Cu Samples	electron, cavity, vacuum, high-voltage	2258
	S. Lagotzky, G. Müller Bergische Universität Wuppertal, Wuppertal, Germany
	Funding: The work is funded by BMBF project 05H12PX6. Enhanced field emission (EFE) limits the performance of both superconducting and normal conducting high-gradient accelerating structures. Systematic field emission scanning microscopy and correlated SEM/EDX measurements of relevant Nb and Cu samples have revealed particulates and surface irregularities with field enhancement factors b = 10 - 90 as origin of EFE. Based on sufficient emitter statistics, an exponential increase of the emitter number density N with increasing surface field (E) was found. This allows a prediction of the EFE loading of future ILC and CLIC accelerating structures by scaling of N to relevant E and using a weighted integration over the high-field cavity surface. Accordingly, an electropolished (Ra < 300 nm) and dry-ice cleaned (DIC) TESLA-shape 9-cell 1.3 GHz Nb cavity * will still suffer from EFE at Eacc = 35 MV/m (N = 0.3 /cm² at Epeak = 70 MV/m). Moreover, a diamond-turned, chemically etched and DIC 11.2 GHz Cu structure ** will breakdown at Eacc = 100 MV/m (N = 20 /cm² at Epeak = 243 MV/m). Possible improvements, i.e. by emitter processing will be discussed. * ILC Technical Design Report (2013) ** A. Grudiev and W. Wuensch, Proceedings of LINAC2010, Tsukuba, Japan, pp. 211 - 213
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPME004
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPME005	Enhanced Field Emission and Emitter Activation on Flat Dry-ice Cleaned Cu Samples	site, electron, vacuum, gun	2261
	S. Lagotzky, G. Müller, P. Serbun Bergische Universität Wuppertal, Wuppertal, Germany S. Calatroni, T. Muranaka CERN, Geneva, Switzerland
	Enhanced field emission (EFE), resulting in dark currents and electric breakdowns, is one of the main gradient limitations for the CLIC accelerating structures (actual design Eacc = 100 MV/m, Epeak = 240 MV/m ). Measurements on diamond-turned, flat (Ra = 158 nm) Cu samples showed first EFE at surface fields Es = 130 MV/m. In order to reduce EFE, we have installed a commercial dry ice cleaning (DIC) system in a clean room environment (class iso 5). Accordingly, the number density of emitters (N) was significantly decreased by DIC from N = 52 /cm² to N = 12 /cm² at Es = 190 MV/m. Furthermore we have tested two diamond-turned and chemically etched (SLAC treatment, Ra = 150 nm) Cu samples after DIC resulting in EFE onset at 230 MV/m. Locally measured I(V) curves of the strongest emitters yielded field enhancement factors b = 10 – 90 (10 – 85) on the diamond-turned (chemically etched), respectively. SEM and EDX investigations of the located emission sites revealed surface defects and few particulates (Al, Ca, Si) as origin of the EFE. Moreover, strong emitter activation effects were observed. A possible breakdown mechanism based on this EFE activation will be discussed. A. Grudiev and W. Wuensch, Proceedings of LINAC2010, Tsukuba, Japan, pp. 211 - 213
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPME005
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPME040	Development of Aluminium Vacuum Chambers for the LHC Experiments at CERN	vacuum, experiment, beam-losses, electron	2354
	M.A. Gallilee, P. Chiggiato, P. Costa Pinto, L.M.A. Ferreira, P. Lepeule, J. Perez Espinos, L. Prever-Loiri, A. Sapountzis CERN, Geneva, Switzerland
	Beam losses may cause activation of vacuum chamber walls, in particular those of the Large Hadron Collider (LHC) experiments. For the High Luminosity LHC, the activation of such vacuum chambers will increase. It is therefore necessary to use a vacuum chamber material which interacts less with the circulating beam. While beryllium is reserved for the collision point, a good compromise between cost, availability and transparency is obtained with aluminium alloys; such materials are a preferred choice with respect to austenitic stainless steel. Manufacturing a thin-wall aluminium vacuum chamber presents several challenges as the material grade needs to be machinable, weldable, leak-tight for small thicknesses, and able to withstand heating to 250°C for extended periods of time. This paper presents some of the technical challenges during the manufacture of these vacuum chambers and the methods for overcoming production difficulties, including surface treatments and NEG thin-film coating.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPME040
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPME043	Design and Qualification of Transparent Beam Vacuum Chamber Supports for the LHCb Experiment	experiment, operation, vacuum, proton	2363
	J.L. Bosch, P. Chiggiato, C. Garion CERN, Geneva, Switzerland
	Beryllium beam vacuum chambers pass through the aperture of the large dipole magnet and particle acceptance region of the LHCb experiment, coaxial to the LHC beam. At the interior of the magnet, a system of rods and cables supports the chambers, holding them rigidly in place, in opposition to the vacuum forces caused by their conical geometry. In the scope of the current upgrade program, the steel and aluminium structural components are replaced by a newly designed system, making use of Beryllium, in addition to a number of organic materials, and are optimized for overall transparency to incident particles. Presented in this paper are the design criteria, along with the unique design developments carried out at CERN, and furthermore, a description of the technologies procured from industrial partners, specifically in obtaining the best solution for the cable components.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPME043
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPRI009	Parameter Studies and Geometry Optimization on Superconducting Multicell RF Cavity Resonators	cavity, HOM, coupling, RF-structure	2496
	B.D. Isbarn, B. Riemann, M. Sommer, T. Weis DELTA, Dortmund, Germany
	Funding: Work partly supported by the BMBF under contract No. 05K13PEB Modern accelerator concepts for high intensity electron beams often require superconducting multicell RF-cavity-resonators in circular accelerators (e.g. storage rings). Caused by strong beam-cavity interaction and due to high quality factors of superconducting RF-structures special care of lower order (LOM) and higher order (HOM) modes must be taken. Various numerical studies were performed to numerically calculate the dependence of different figures of merit (e.g. external quality factors Qext) with respect to the geometry parameters and cell number of the RF-structure, focused on the propagation and damping of low and higher order modes. To ease the numerical effort an optimization routine has been developed which automatically optimizes the geometry based on goal functions. In this context it turned out that cell geometries defined by spline functions have advantages compared to the standard elliptical parametrization regularly used. The number of free parameters is substantially reduced which facilitates the search for optimum solutions.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPRI009
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPRI011	Progress of R&D on SRF Cavities at DESY towards the ILC Performance Goal	cavity, SRF, accelerating-gradient, electron	2499
	A. Navitski DESY, Hamburg, Germany A. Prudnikava, Y. Tamashevich Uni HH, Hamburg, Germany
	Funding: BMBF project 05H12GU9, Alexander von Humboldt Foundation, CRISP (No. 283745) and ”Construction of New Infrastructures-Preparatory Phase” ILC-HiGrade (No. 206711) of the EU 7th FP7/2007-2013 Programme. The R&D program of the ILC-HiGrade group at DESY aims at a solid understanding and control of the industrial mass-production process of the superconducting radio-frequency accelerating cavities that are being manufactured for the European X-ray Free Electron Laser (EXFEL). This accelerator is currently under construction at DESY. As well as the main production cavities for XFEL, 24 additional cavities are being constructed as part of the ILC-HiGrade program. The goal is to identify the gradient-limiting factors and further refine the cavity-treatment technique to understand how to achieve gradients above 35 MV/m at >90% production yield in an industrial context. Techniques such as 2nd sound and temperature mapping for the quench detection, OBACHT optical inspections, as well as Centrifugal Barrel Polishing (CBP) and Local Grinding repair are foreseen as tools. Actual status, details, and achievements will be reported.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPRI011
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPRI023	Review of the Multilayer Coating Model	experiment, vacuum, interface	2522
	T. Kubo, T. Saeki KEK, Ibaraki, Japan Y. Iwashita Kyoto ICR, Uji, Kyoto, Japan
	Structures of alternating layers of superconducting (Sc) and insulating films formed on a bulk Sc proposed by A. Gurevich in 2006 are actively discussed these years, because of their great possibility in reducing power consumptions and in enhancing RF breakdown field of the Sc RF cavity. On Apr. 2013, we submitted general formulae for the vortex penetration field of the Sc layer and the shielded magnetic field on the bulk Sc for a structure with a single Sc layer and a single insulator layer formed on a bulk Sc, by which a combination of the thicknesses of Sc and insulator layers that can realize the enhanced RF breakdown field can be found for any given materials. In this contribution, we will show progresses during the last year. Comparisons between the formulae and experimental results, and extended formulae for more realistic models, such as a model with surface defects, will be shown. T. Kubo, Y. Iwashita, and T. Saeki, Appl. Phys. Lett. 104, 032603 (2014); arXiv:1304.6876 [physics.acc-ph]; arXiv:1306.4823 [physics.acc-ph]; arXiv:1307.0583 [physics.acc-ph].
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPRI023
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPRI041	Progress of HOM Couplers for CERN SPL Cavities	HOM, simulation, cavity, niobium	2568
	K. Papke, F. Gerigk CERN, Geneva, Switzerland U. van Rienen Rostock University, Faculty of Computer Science and Electrical Engineering, Rostock, Germany
	Funding: Work supported by the Wolfgang-Gentner-Programme of the Bundesministerium für Bildung und Forschung (BMBF) In this paper we present the progress of the Higher-Order-Mode (HOM) coupler design for the high beta CERN SPL (Superconducting Proton Linac) cavities. This includes the RF transmission behavior as well as mechanical and thermal requirements and their optimizations. Warm RF measurements are presented for the first four high beta SPL Cavities made of bulk niobium. Moreover the first prototype of a HOMcoupler will be introduced and we discuss its characteristics and its tuning possibilities.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPRI041
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPRI062	The Joint High Q0 R&D Program for LCLS-II	cavity, cryomodule, linac, SRF	2627
	M. Liepe, R.G. Eichhorn, F. Furuta, G.M. Ge, D. Gonnella, G.H. Hoffstaetter Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA A.C. Crawford, A. Grassellino, A. Hocker, O.S. Melnychuk, A. Romanenko, A.M. Rowe, D.A. Sergatskov Fermilab, Batavia, Illinois, USA R.L. Geng, A.D. Palczewski, C.E. Reece JLab, Newport News, Virginia, USA M.C. Ross SLAC, Menlo Park, California, USA
	The superconducting RF linac for LCLS-II calls for 1.3 GHz 9-cell cavities with an average intrinsic quality factor Q0 of 2.7·10¹⁰ at 2K and 16 MV/m accelerating gradient. A collaborative effort between Cornell University, FNAL, and JLab has been set up with the goal of developing and demonstrating a cavity treatment protocol for the LCLS-II cavities meeting these specifications. The high Q0 treatment protocol is based on nitrogen doping of the RF surface layer during a high temperature heat treatment. This novel SRF cavity preparation was recently developed at FNAL and shown to result in SRF cavities of very high Q0 at 2K with an increase in Q0 from low to medium fields. N-doped single cell cavities at Cornell, FNAL, and JLab routinely exceed LCLS-II specification. 9-cell N-doped cavities at FNAL achieve an average Q0(T=2K, 16 MV/m) of ≈ 3.4·10¹⁰ with an average quench field of ≈ 19 MV/m, meeting therefore overall with good margin the LCLS-II specification.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPRI062
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPRI087	Magnetic Field Measurement System for the SuperKEKB Final Focus Superconducting Magnets	quadrupole, dipole, superconducting-magnet, luminosity	2693
	N. Ohuchi, Y. Arimoto, M. Iwasaki, M.K. Kawai, Y. Kondo, Y. Makida, K. Tsuchiya, H. Yamaoka, Z.G. Zong KEK, Ibaraki, Japan
	SuperKEKB are now being constructed with a target luminosity of 8×1035 which is 40 times higher than KEKB. This luminosity can be achieved by the "Nano-Beam" scheme, in which both beams should be squeezed to about 50 nm at the beam interaction point, IP. The beam final focusing system consists of 8 superconducting quadrupole magnets, 4 superconducting solenoids and 43 superconducting corrector coils. The magnetic field measurement systems with the vertical cryostats were designed and constructed for performing the acceptance test of these magnets at 4 K. The field measurements are performed by the 6 different harmonic coils and a Hall probe. The higher order multi-pole field distributions along the magnet axes are very important for the beam operation, and then these distributions are measured with the 20 mm long harmonic coils. The integral fields of quadrupole magnets are measured with the 600 mm long harmonic coils. We will describe the magnetic field measurement system.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPRI087
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPRO027	Turkish Accelerator Center: The Status and Roadmap	FEL, electron, linac, proton	2921
	A.A. Aksoy, O. Yavaş, H.D. Duran Yıldız Ankara University, Accelerator Technologies Institute, Golbasi / Ankara, Turkey B. Akkus, S. Özkorucuklu, L.S. Yalcin Istanbul University, Istanbul, Turkey H. Aksakal, Z. Nergiz Nigde University, Nigde University Science & Art Faculty, Nigde, Turkey E. Algin Eskisehir Osmangazi University, Eskisehir, Turkey O. Cakir Ankara University, Faculty of Sciences, Ankara, Turkey
	Funding: Ankara University Turkish Accelerator Center (TAC) Project has started with support of the Ministry of Development (MD) of Turkey under the coordination of Ankara University. TAC is an inter-university collaboration with 12 Turkish Universities. An IR FEL facility (TARLA) based on Sc linac with 15-40 MeV energy under construction in Ankara as the first facility of TAC. It is expected that the TARLA facility will be commissioning in 2017. In addition to the TARLA, it is planned that Turkish Accelerator Center will include a third generation synchrotron radiation facility based on 1-3 GeV electron synchrotron (TAC SR), a fourth generation SASE FEL facility based on up to 5 GeV electron linac (TAC SASE FEL), a multi-purpose proton accelerator facility with 3 MeV-2 GeV beam energy (TAC PAF) and an electron-positron collider as a super charm factory (TAC PF). Construction phase of the proposed GeV scale accelerator facilities will cover next decade. In this presentation, main goals and road map of Turkish Accelerator Center will be explained. (http://thm.ankara.edu.tr) *On behalf of TAC collaboration
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRO027
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPRO049	Magnet AC Analysis of a Taiwan Light Source Booster	quadrupole, electron, booster, network	2977
	H.C. Chen, H.H. Chen, S. Fann, S.J. Huang, A.P. Lee, J.A. Li, C.C. Liang, Y.K. Lin NSRRC, Hsinchu, Taiwan
	The Response Surface Methodology (RSM), is used to study the optimization process of magnet AC in the booster for Taiwan Light Source (TLS) in National Synchrotron Radiation Research Center (NSRRC). A study model was constructed based on the Artificial Neural Network (ANN) theory. The theoretical model and optimization procedure were both implemented to evaluate the model. The details of the study will be reported in this paper.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRO049
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, collider	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)

THPRI087	Magnet Design for the Target System of a Muon Collider/Neutrino Factory	target, collider, 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, collider, 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, collider, 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)

THPRI101	Coupler Kick and Cavity Tilt Effects on Emittance Preservation in Linear Accelerators	emittance, wakefield, cavity, linac	4013
	A.V. Tsakanian, G.A. Amatuni, B. Grigoryan, I.N. Margaryan, V.M. Tsakanov CANDLE SRI, Yerevan, Armenia
	The effects of the coupler kick and the cavity tilts on the beam dynamics in long linear accelerator are studied. The dispersive and wakefield caused beam emittance dilution are evaluated analytically using two particle model of the beam. The numerical simulations for the European XFEL project are presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRI101
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Other Keywords

Page

MOPRO071

Wake Field and Impedance Calculation due to the Beam Position Monitor in the ILSF Storage Ring

impedance, vacuum, wakefield, storage-ring

246

H. Ghasem
IPM, Tehran, Iran
M. Razazian
ILSF, Tehran, Iran

The Beam Position Monitors (BPMs) are usually used in the particles accelerators to observe position of the beam and to record longitudinal bunch shape. As the vertical beam size demands beam stabilities on the submicron level in the particle accelerators, there must be a sever precision on designing and fabrication of the BPMs. In this paper, we have explored effect of the BPMs on the total impedance and loss factor of the ILSF storage ring.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPRO071

Export •

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

MOPME026

IBS Simulations with Compute Unified Device Architecture (CUDA) Technology

scattering, simulation, GPU, electron

436

S.A. Glukhov, E.B. Levichev, S.A. Nikitin, P.A. Piminov, D.N. Shatilov, S.V. Sinyatkin
BINP SB RAS, Novosibirsk, Russia

A program code for 6D tracking has been developed taking into account IBS (Intra-Beam Scattering) and Touschek effect and using Monte-Carlo method. The simulation algorithm has been developed on the basis of well-known IBS theory presented in (*). The resulting program can be executed using GPGPU devices (General-Purpose Graphics Processing Units) supporting CUDA technology (Compute Unified Device Architecture).
* J. Le Duff, Single and multiple Touschek effects // Published in In Rhodos 1993, Advanced accelerator physics, vol. 2 573-586. CERN Geneva - CERN-95-06 (95/11,rec. Mar.96) 1993. p. 573-586.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPME026

Export •

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

MOPRI007

Design and Simulation of a High Intensity Muon Beam Production for Neutrino Experiments.

target, proton, solenoid, emittance

589

H. K. Sayed, H.G. Kirk, R.B. Palmer, D. Stratakis
BNL, Upton, Long Island, New York, USA
K.T. McDonald
PU, Princeton, New Jersey, USA
D.V. Neuffer
Fermilab, Batavia, Illinois, USA

The production process of pions which then decay into muons, yields a muon beam with large transverse and longitudinal emittances. Such beam requires phase space manipulation to reduce the total 6D emittance before it could go through any acceleration stage. The design of the muon beam manipulation is based on Neutrino Factory front end design. In this study we report on a multi objective - multivariable global optimization of the front end using parallel genetic algorithm. The parallel optimization algorithm and the optimization strategy will be discussed and the optimized results will be presented as well.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPRI007

Export •

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

TUOAB01

Computation of Eigenmodes in Long and Complex Accelerating Structures by Means of Concatenation Strategies

cavity, HOM, coupling, FEL

947

T. Flisgen, J. Heller, U. van Rienen
Rostock University, Faculty of Computer Science and Electrical Engineering, Rostock, Germany

Funding: This research was partially funded by the EuCARD project which is co-funded by European Commission 7th in Framework Programme (FP7).
The computation of eigenmodes for complex accelerating structures is a challenging and important task for the design and operation of particle accelerators. Discretizing long and complex structures to determine its eigenmodes leads to demanding computations typically performed on super computers. This contribution presents an application example of a method to compute eigenmodes and other parameters derived from these eigenmodes for long and complex structures using standard workstation computers. This is accomplished by the decomposition of the complex structure into several single segments. In a next step, the electromagnetic properties of the segments are described in terms of a compact state space model. Subsequently, the state space models of the single structures are concatenated to the full structure. The results of direct calculations are compared with results obtained by the concatenation scheme in terms of computational time and accuracy.

Slides TUOAB01 [1.781 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUOAB01

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

collider, detector, radiation, dipole

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)

TUPRO073

RFFAG Decay Ring for nuSTORM

proton, injection, detector, target

1208

J.-B. Lagrange, J. Pasternak
Imperial College of Science and Technology, Department of Physics, London, United Kingdom
R. Appleby, J.M. Garland, H.L. Owen, S.C. Tygier
UMAN, Manchester, United Kingdom
Y. Mori
Kyoto University, Research Reactor Institute, Osaka, Japan

The nuSTORM facility aims to deliver neutrino beams produced from the decay of muons stored in a racetrack ring. Design of racetrack FFAG (Fixed Field Alternating Gradient) decay ring for nuSTORM project is presented in this paper.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRO073

Export •

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

TUPME010

The Physics Programme of next MICE Step IV

emittance, scattering, experiment, simulation

1361

J.C. Nugent
University of Glasgow, Glasgow, United Kingdom
V.C. Palladino
INFN-Napoli, Napoli, Italy

Funding: DOE, NSF, STFC, INFN, CHIPP and several others
The International Muon Ionization Cooling Experiment is progressing towards a full demonstration of the feasibility of ionization cooling technology decisive for neutrino physics and muon colliders. Step IV should provide the first precise measurements of emittances and first evidence of cooling. The components required for Step IV, including spectrometer solenoids, muon trackers and absorber-FC (focus coil) modules have been assembled with data collection expected in 2015. The physics programme of this Step will be described in detail, with LiH and a few other promising absorber materials of different shapes.
Abstract presented by the chair of the speaker bureau of the MICE collaboration, that would next select a MICE member to prepare and present the poster

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPME010

Export •

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

TUPME012

The US Muon Accelerator Program

collider, 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)

TUPME022

Design and Optimization of a Particle Selection System for Muon based Accelerators

proton, solenoid, target, simulation

1395

D. Stratakis, J.S. Berg
BNL, Upton, Long Island, New York, USA
D.V. Neuffer
Fermilab, Batavia, Illinois, USA
P. Snopok
Illinois Institute of Technology, Chicago, Illinois, USA

Funding: Work supported by Brookhaven Science Associates, LC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
In Muon Accelerators muons are produced by impacting high energy protons onto a target to produce pions. The pions decay to muons which are then accelerated. Through this process a significant background of protons and electrons are generated, which may result in heat deposition on superconducting materials and activation of the machine. In this paper we propose a two-step particle selection scheme: a chicane to remove the high momentum particles from the beam and a Beryllium block absorber that reduces momentum of all particles in the beam, resulting in the loss of low momentum protons. We review the design and numerically examine its impact on the performance of the muon front-end.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPME022

Export •

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

TUPRI002

The EUROnu Study for Future High Power Neutrino Oscillation Facilities

target, detector, proton, linac

1553

T.R. Edgecock
STFC/RAL, Chilton, Didcot, Oxon, United Kingdom

The EUROnu project was a 4 year FP7 design study to investigate and compare three possible options for future, high power neutrino oscillation facilities in Europe. These three facilities are a Neutrino Factory, a neutrino superbeam from CERN to the Frejus Laboratory and a so-called Beta Beam. The study was completed at the end of 2012 and has produced conceptual designs for the facilities and preliminary cost estimates. The designs were used to determine the physics performance. These have been used to compare the facilities. This paper will describe the designs, physics performance and costs and summarise the recommendations of the study.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRI002

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, collider, 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)

TUPRI013

Dynamic Aperture Studies of the nuSTORM FFAG Ring

lattice, dynamic-aperture, closed-orbit, detector

1574

R. Appleby, J.M. Garland, H.L. Owen, S.C. Tygier
UMAN, Manchester, United Kingdom
K.M. Hock
Cockcroft Institute, Warrington, Cheshire, United Kingdom
J.-B. Lagrange, J. Pasternak
Imperial College of Science and Technology, Department of Physics, London, United Kingdom

Funding: Research supported by STFC grant number ST/K002503/1 "Racetrack FFAGs for medical, PRISM and energy applications".
FFAG rings with a racetrack configuration are very promising as their flexible design allow for dedicated spaces for injection/extraction, RF cavities etc. A racetrack FFAG is considered as an option for the nuSTORM facility, which aims to deliver neutrino beams produced from the decay of muons stored in a ring with long sections pointing towards detectors. In this paper we discuss the definition of dynamic aperture in these machines and use the PyZgoubi framework to compute the many turn motion in the nuSTORM ring. The roles of machine imperfections and symmetry are discussed.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRI013

Export •

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

TUPRI049

Geometric Beam Coupling Impedance of LHC Secondary Collimators

impedance, simulation, HOM, wakefield

1677

O. Frasciello, S. Tomassini, M. Zobov
INFN/LNF, Frascati (Roma), Italy
A. Grudiev, N. Mounet, B. Salvant
CERN, Geneva, Switzerland

Funding: Work supported by European Commission within the Framework Programme 7 Capacities Specific Programme, Grant Agreement 284404
The High Luminosity LHC project is aimed at increasing the LHC luminosity by an order of magnitude. One of the key ingredients to achieve the luminosity goal is the beam intensity increase. In order to keep under control beam instabilities and to avoid excessive power losses a careful design of new vacuum chamber components and an improvement of the present LHC impedance model are required. Collimators are the main impedance contributors. Measurements with beam have revealed that the betatron coherent tune shifts were by about a factor of 2 higher with respect to the theoretical predictions based on the current model. Up to now the resistive wall impedance has been considered as the major impedance contribution for collimators. By carefully simulating their geometric impedance we show that for the graphite collimators with half-gaps higher than 10 mm the geometric impedance exceeds the resistive wall one. In turn, for the tungsten collimators the geometric impedance dominates for all used gap values. Hence, including the geometric collimator impedance into the LHC impedance model enabled us to reach a better agreement between the measured and simulated collimator tune shifts.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRI049

Export •

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

WEZA02

A Staged Muon Accelerator Facility for Neutrino and Collider Physics

collider, 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)

WEIB05

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

collider, 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)

WEPME004

Prediction of Severe Electron Loading of High-gradient Accelerating Structures based on Field Emission Measurements of Nb and Cu Samples

electron, cavity, vacuum, high-voltage

2258

S. Lagotzky, G. Müller
Bergische Universität Wuppertal, Wuppertal, Germany

Funding: The work is funded by BMBF project 05H12PX6.
Enhanced field emission (EFE) limits the performance of both superconducting and normal conducting high-gradient accelerating structures. Systematic field emission scanning microscopy and correlated SEM/EDX measurements of relevant Nb and Cu samples have revealed particulates and surface irregularities with field enhancement factors b = 10 - 90 as origin of EFE. Based on sufficient emitter statistics, an exponential increase of the emitter number density N with increasing surface field (E) was found. This allows a prediction of the EFE loading of future ILC and CLIC accelerating structures by scaling of N to relevant E and using a weighted integration over the high-field cavity surface. Accordingly, an electropolished (Ra < 300 nm) and dry-ice cleaned (DIC) TESLA-shape 9-cell 1.3 GHz Nb cavity * will still suffer from EFE at Eacc = 35 MV/m (N = 0.3 /cm² at Epeak = 70 MV/m). Moreover, a diamond-turned, chemically etched and DIC 11.2 GHz Cu structure ** will breakdown at Eacc = 100 MV/m (N = 20 /cm² at Epeak = 243 MV/m). Possible improvements, i.e. by emitter processing will be discussed.
* ILC Technical Design Report (2013)
** A. Grudiev and W. Wuensch, Proceedings of LINAC2010, Tsukuba, Japan, pp. 211 - 213

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPME004

Export •

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

WEPME005

Enhanced Field Emission and Emitter Activation on Flat Dry-ice Cleaned Cu Samples

site, electron, vacuum, gun

2261

S. Lagotzky, G. Müller, P. Serbun
Bergische Universität Wuppertal, Wuppertal, Germany
S. Calatroni, T. Muranaka
CERN, Geneva, Switzerland

Enhanced field emission (EFE), resulting in dark currents and electric breakdowns, is one of the main gradient limitations for the CLIC accelerating structures (actual design Eacc = 100 MV/m, Epeak = 240 MV/m *). Measurements on diamond-turned, flat (Ra = 158 nm) Cu samples showed first EFE at surface fields Es = 130 MV/m. In order to reduce EFE, we have installed a commercial dry ice cleaning (DIC) system in a clean room environment (class iso 5). Accordingly, the number density of emitters (N) was significantly decreased by DIC from N = 52 /cm² to N = 12 /cm² at Es = 190 MV/m. Furthermore we have tested two diamond-turned and chemically etched (SLAC treatment, Ra = 150 nm) Cu samples after DIC resulting in EFE onset at 230 MV/m. Locally measured I(V) curves of the strongest emitters yielded field enhancement factors b = 10 – 90 (10 – 85) on the diamond-turned (chemically etched), respectively. SEM and EDX investigations of the located emission sites revealed surface defects and few particulates (Al, Ca, Si) as origin of the EFE. Moreover, strong emitter activation effects were observed. A possible breakdown mechanism based on this EFE activation will be discussed.
* A. Grudiev and W. Wuensch, Proceedings of LINAC2010, Tsukuba, Japan, pp. 211 - 213

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPME005

Export •

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

WEPME040

Development of Aluminium Vacuum Chambers for the LHC Experiments at CERN

vacuum, experiment, beam-losses, electron

2354

M.A. Gallilee, P. Chiggiato, P. Costa Pinto, L.M.A. Ferreira, P. Lepeule, J. Perez Espinos, L. Prever-Loiri, A. Sapountzis
CERN, Geneva, Switzerland

Beam losses may cause activation of vacuum chamber walls, in particular those of the Large Hadron Collider (LHC) experiments. For the High Luminosity LHC, the activation of such vacuum chambers will increase. It is therefore necessary to use a vacuum chamber material which interacts less with the circulating beam. While beryllium is reserved for the collision point, a good compromise between cost, availability and transparency is obtained with aluminium alloys; such materials are a preferred choice with respect to austenitic stainless steel. Manufacturing a thin-wall aluminium vacuum chamber presents several challenges as the material grade needs to be machinable, weldable, leak-tight for small thicknesses, and able to withstand heating to 250°C for extended periods of time. This paper presents some of the technical challenges during the manufacture of these vacuum chambers and the methods for overcoming production difficulties, including surface treatments and NEG thin-film coating.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPME040

Export •

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

WEPME043

Design and Qualification of Transparent Beam Vacuum Chamber Supports for the LHCb Experiment

experiment, operation, vacuum, proton

2363

J.L. Bosch, P. Chiggiato, C. Garion
CERN, Geneva, Switzerland

Beryllium beam vacuum chambers pass through the aperture of the large dipole magnet and particle acceptance region of the LHCb experiment, coaxial to the LHC beam. At the interior of the magnet, a system of rods and cables supports the chambers, holding them rigidly in place, in opposition to the vacuum forces caused by their conical geometry. In the scope of the current upgrade program, the steel and aluminium structural components are replaced by a newly designed system, making use of Beryllium, in addition to a number of organic materials, and are optimized for overall transparency to incident particles. Presented in this paper are the design criteria, along with the unique design developments carried out at CERN, and furthermore, a description of the technologies procured from industrial partners, specifically in obtaining the best solution for the cable components.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPME043

Export •

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

WEPRI009

Parameter Studies and Geometry Optimization on Superconducting Multicell RF Cavity Resonators

cavity, HOM, coupling, RF-structure

2496

B.D. Isbarn, B. Riemann, M. Sommer, T. Weis
DELTA, Dortmund, Germany

Funding: Work partly supported by the BMBF under contract No. 05K13PEB
Modern accelerator concepts for high intensity electron beams often require superconducting multicell RF-cavity-resonators in circular accelerators (e.g. storage rings). Caused by strong beam-cavity interaction and due to high quality factors of superconducting RF-structures special care of lower order (LOM) and higher order (HOM) modes must be taken. Various numerical studies were performed to numerically calculate the dependence of different figures of merit (e.g. external quality factors Qext) with respect to the geometry parameters and cell number of the RF-structure, focused on the propagation and damping of low and higher order modes. To ease the numerical effort an optimization routine has been developed which automatically optimizes the geometry based on goal functions. In this context it turned out that cell geometries defined by spline functions have advantages compared to the standard elliptical parametrization regularly used. The number of free parameters is substantially reduced which facilitates the search for optimum solutions.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPRI009

Export •

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

WEPRI011

Progress of R&D on SRF Cavities at DESY towards the ILC Performance Goal

cavity, SRF, accelerating-gradient, electron

2499

A. Navitski
DESY, Hamburg, Germany
A. Prudnikava, Y. Tamashevich
Uni HH, Hamburg, Germany

Funding: BMBF project 05H12GU9, Alexander von Humboldt Foundation, CRISP (No. 283745) and ”Construction of New Infrastructures-Preparatory Phase” ILC-HiGrade (No. 206711) of the EU 7th FP7/2007-2013 Programme.
The R&D program of the ILC-HiGrade group at DESY aims at a solid understanding and control of the industrial mass-production process of the superconducting radio-frequency accelerating cavities that are being manufactured for the European X-ray Free Electron Laser (EXFEL). This accelerator is currently under construction at DESY. As well as the main production cavities for XFEL, 24 additional cavities are being constructed as part of the ILC-HiGrade program. The goal is to identify the gradient-limiting factors and further refine the cavity-treatment technique to understand how to achieve gradients above 35 MV/m at >90% production yield in an industrial context. Techniques such as 2nd sound and temperature mapping for the quench detection, OBACHT optical inspections, as well as Centrifugal Barrel Polishing (CBP) and Local Grinding repair are foreseen as tools. Actual status, details, and achievements will be reported.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPRI011

Export •

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

WEPRI023

Review of the Multilayer Coating Model

experiment, vacuum, interface

2522

T. Kubo, T. Saeki
KEK, Ibaraki, Japan
Y. Iwashita
Kyoto ICR, Uji, Kyoto, Japan

Structures of alternating layers of superconducting (Sc) and insulating films formed on a bulk Sc proposed by A. Gurevich in 2006 are actively discussed these years, because of their great possibility in reducing power consumptions and in enhancing RF breakdown field of the Sc RF cavity. On Apr. 2013, we submitted general formulae for the vortex penetration field of the Sc layer and the shielded magnetic field on the bulk Sc for a structure with a single Sc layer and a single insulator layer formed on a bulk Sc, by which a combination of the thicknesses of Sc and insulator layers that can realize the enhanced RF breakdown field can be found for any given materials. In this contribution, we will show progresses during the last year. Comparisons between the formulae and experimental results, and extended formulae for more realistic models, such as a model with surface defects, will be shown.
T. Kubo, Y. Iwashita, and T. Saeki, Appl. Phys. Lett. 104, 032603 (2014); arXiv:1304.6876 [physics.acc-ph]; arXiv:1306.4823 [physics.acc-ph]; arXiv:1307.0583 [physics.acc-ph].

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPRI023

Export •

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

WEPRI041

Progress of HOM Couplers for CERN SPL Cavities

HOM, simulation, cavity, niobium

2568

K. Papke, F. Gerigk
CERN, Geneva, Switzerland
U. van Rienen
Rostock University, Faculty of Computer Science and Electrical Engineering, Rostock, Germany

Funding: Work supported by the Wolfgang-Gentner-Programme of the Bundesministerium für Bildung und Forschung (BMBF)
In this paper we present the progress of the Higher-Order-Mode (HOM) coupler design for the high beta CERN SPL (Superconducting Proton Linac) cavities. This includes the RF transmission behavior as well as mechanical and thermal requirements and their optimizations. Warm RF measurements are presented for the first four high beta SPL Cavities made of bulk niobium. Moreover the first prototype of a HOMcoupler will be introduced and we discuss its characteristics and its tuning possibilities.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPRI041

Export •

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

WEPRI062

The Joint High Q0 R&D Program for LCLS-II

cavity, cryomodule, linac, SRF

2627

M. Liepe, R.G. Eichhorn, F. Furuta, G.M. Ge, D. Gonnella, G.H. Hoffstaetter
Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
A.C. Crawford, A. Grassellino, A. Hocker, O.S. Melnychuk, A. Romanenko, A.M. Rowe, D.A. Sergatskov
Fermilab, Batavia, Illinois, USA
R.L. Geng, A.D. Palczewski, C.E. Reece
JLab, Newport News, Virginia, USA
M.C. Ross
SLAC, Menlo Park, California, USA

The superconducting RF linac for LCLS-II calls for 1.3 GHz 9-cell cavities with an average intrinsic quality factor Q0 of 2.7·10¹⁰ at 2K and 16 MV/m accelerating gradient. A collaborative effort between Cornell University, FNAL, and JLab has been set up with the goal of developing and demonstrating a cavity treatment protocol for the LCLS-II cavities meeting these specifications. The high Q0 treatment protocol is based on nitrogen doping of the RF surface layer during a high temperature heat treatment. This novel SRF cavity preparation was recently developed at FNAL and shown to result in SRF cavities of very high Q0 at 2K with an increase in Q0 from low to medium fields. N-doped single cell cavities at Cornell, FNAL, and JLab routinely exceed LCLS-II specification. 9-cell N-doped cavities at FNAL achieve an average Q0(T=2K, 16 MV/m) of ≈ 3.4·10¹⁰ with an average quench field of ≈ 19 MV/m, meeting therefore overall with good margin the LCLS-II specification.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPRI062

Export •

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

WEPRI087

Magnetic Field Measurement System for the SuperKEKB Final Focus Superconducting Magnets

quadrupole, dipole, superconducting-magnet, luminosity

2693

N. Ohuchi, Y. Arimoto, M. Iwasaki, M.K. Kawai, Y. Kondo, Y. Makida, K. Tsuchiya, H. Yamaoka, Z.G. Zong
KEK, Ibaraki, Japan

SuperKEKB are now being constructed with a target luminosity of 8×1035 which is 40 times higher than KEKB. This luminosity can be achieved by the "Nano-Beam" scheme, in which both beams should be squeezed to about 50 nm at the beam interaction point, IP. The beam final focusing system consists of 8 superconducting quadrupole magnets, 4 superconducting solenoids and 43 superconducting corrector coils. The magnetic field measurement systems with the vertical cryostats were designed and constructed for performing the acceptance test of these magnets at 4 K. The field measurements are performed by the 6 different harmonic coils and a Hall probe. The higher order multi-pole field distributions along the magnet axes are very important for the beam operation, and then these distributions are measured with the 20 mm long harmonic coils. The integral fields of quadrupole magnets are measured with the 600 mm long harmonic coils. We will describe the magnetic field measurement system.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPRI087

Export •

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

THPRO027

Turkish Accelerator Center: The Status and Roadmap

FEL, electron, linac, proton

2921

A.A. Aksoy, O. Yavaş, H.D. Duran Yıldız
Ankara University, Accelerator Technologies Institute, Golbasi / Ankara, Turkey
B. Akkus, S. Özkorucuklu, L.S. Yalcin
Istanbul University, Istanbul, Turkey
H. Aksakal, Z. Nergiz
Nigde University, Nigde University Science & Art Faculty, Nigde, Turkey
E. Algin
Eskisehir Osmangazi University, Eskisehir, Turkey
O. Cakir
Ankara University, Faculty of Sciences, Ankara, Turkey

Funding: Ankara University
Turkish Accelerator Center (TAC) Project has started with support of the Ministry of Development (MD) of Turkey under the coordination of Ankara University. TAC is an inter-university collaboration with 12 Turkish Universities. An IR FEL facility (TARLA) based on Sc linac with 15-40 MeV energy under construction in Ankara as the first facility of TAC. It is expected that the TARLA facility will be commissioning in 2017. In addition to the TARLA, it is planned that Turkish Accelerator Center will include a third generation synchrotron radiation facility based on 1-3 GeV electron synchrotron (TAC SR), a fourth generation SASE FEL facility based on up to 5 GeV electron linac (TAC SASE FEL), a multi-purpose proton accelerator facility with 3 MeV-2 GeV beam energy (TAC PAF) and an electron-positron collider as a super charm factory (TAC PF). Construction phase of the proposed GeV scale accelerator facilities will cover next decade. In this presentation, main goals and road map of Turkish Accelerator Center will be explained. (http://thm.ankara.edu.tr)
*On behalf of TAC collaboration

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRO027

Export •

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

THPRO049

Magnet AC Analysis of a Taiwan Light Source Booster

quadrupole, electron, booster, network

2977

H.C. Chen, H.H. Chen, S. Fann, S.J. Huang, A.P. Lee, J.A. Li, C.C. Liang, Y.K. Lin
NSRRC, Hsinchu, Taiwan

The Response Surface Methodology (RSM), is used to study the optimization process of magnet AC in the booster for Taiwan Light Source (TLS) in National Synchrotron Radiation Research Center (NSRRC). A study model was constructed based on the Artificial Neural Network (ANN) theory. The theoretical model and optimization procedure were both implemented to evaluate the model. The details of the study will be reported in this paper.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRO049

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, collider

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)

THPRI087

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

target, collider, 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, collider, 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, collider, 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)

THPRI101

Coupler Kick and Cavity Tilt Effects on Emittance Preservation in Linear Accelerators

emittance, wakefield, cavity, linac

4013

A.V. Tsakanian, G.A. Amatuni, B. Grigoryan, I.N. Margaryan, V.M. Tsakanov
CANDLE SRI, Yerevan, Armenia

The effects of the coupler kick and the cavity tilts on the beam dynamics in long linear accelerator are studied. The dispersive and wakefield caused beam emittance dilution are evaluated analytically using two particle model of the beam. The numerical simulations for the European XFEL project are presented.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRI101

Export •

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