Keyword: collider
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MOXAA01 International Linear Collider, Latest Status towards Realization linear-collider, superconducting-RF, cryomodule, electron 1
 
  • S. Komamiya
    ICEPP, Tokyo, Japan
  
  This presentation describes the International Linear Collider (ILC), an e+ and e- collider based on the superconducting linear accelerator with a center of mass energy of 500 GeV in the first stage, upgradeable to 1 TeV. According to the statement of the Science Council of Japan, MEXT (Ministry of Education, Science, and Sports) and the Japanese government have investigated the feasibility of the ILC project, not only from the scientific view, but also the political, economical, and sociological points of view. The latest status of the project will be presented.  
slides icon Slides MOXAA01 [12.564 MB]  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOXAA01  
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MOYCA01 Review of Linear Optics Measurements and Corrections in Accelerators optics, coupling, quadrupole, betatron 20
 
  • R. Tomás
    CERN, Geneva, Switzerland
  • M. Aiba
    PSI, Villigen PSI, Switzerland
  • A. Franchi
    ESRF, Grenoble, France
  • U. Iriso
    ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
  
  The measurement and correction of optics parameters has been a major concern since the advent of strong focusing synchrotron accelerators. Traditionally, colliders have led the development of methods for optics control based on turn-by-turn centroid data, while lepton storage rings have focused on closed orbit response techniques. Recently considerable efforts are being invested in comparing these techniques in different light sources and colliders. An emerging class of less invasive optics control techniques based on the optimization of performance related observables is demonstrating a great potential. A review of the existing techniques is presented highlighting comparisons, merits and limitations.  
slides icon Slides MOYCA01 [4.184 MB]  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOYCA01  
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MOZA01 Simulated Beam-beam Limits for Circular Lepton and Hadron Colliders simulation, luminosity, lepton, hadron 27
 
  • K. Ohmi
    KEK, Ibaraki, Japan
  
  The beam-beam limit is one of the most important collider parameters. For lepton colliders the empirical tune shift limits are higher than for hadron colliders, which has been attributed to strong radiation damping. The beam-beam limit in hadron colliders, like the LHC, can be affected by noise. For future higher-energy colliders, like FCC-hh or SppC, the limit can be higher or lower, in the presence of still rather weak synchrotron radiation. For circular lepton colliders, like DAΦNE, SuperKEKB, FCC-ee or CepC, the effect of large Piwinski angle, and crab waist, as well as the dependence of the beam-beam limit on the number of interaction points are important questions. This presentation reviews the state of the art in weak-strong, quasi-strong-strong and strong-strong beam-beam simulations and reports the various dependencies of the simulated beam-beam limit on the aforementioned parameters.  
slides icon Slides MOZA01 [4.453 MB]  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOZA01  
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MOOCB01 PACMAN Project: A New Solution for the High-accuracy Alignment of Accelerator Components alignment, quadrupole, target, simulation 58
 
  • H. Mainaud Durand, K. Artoos, M.C.L. Buzio, D. Caiazza, N. Catalán Lasheras, A. Cherif, I.P. Doytchinov, J.-F. Fuchs, A. Gaddi, N. Galindo Munoz, J. Gayde, S.W. Kamugasa, M. Modena, P. Novotny, S. Russenschuck, C. Sanz, G. Severino, D. Tshilumba, V. Vlachakis, M. Wendt, S. Zorzetti
    CERN, Geneva, Switzerland
  
  The beam alignment requirements for the next generation of lepton colliders have become increasingly challenging. As an example, the alignment requirements for the three major collider components of the CLIC linear collider are as follows. Before the first beam circulates, the Beam Position Monitors (BPM), Accelerating Structures (AS)and quadrupoles will have to be aligned up to 10 μm w.r.t. a straight line over 200 m long segments, along the 20 km of linacs. PACMAN is a study on Particle Accelerator Components' Metrology and Alignment to the Nanometre scale. It is an Innovative Doctoral Program, funded by the EU and hosted by CERN, providing high quality training to 10 Early Stage Researchers working towards a PhD thesis. The technical aim of the project is to improve the alignment accuracy of the CLIC components by developing new methods and tools addressing several steps of alignment simultaneously, to gain time and accuracy. The tools and methods developed will be validated on a test bench. This paper presents the technical systems to be integrated in the test bench, the results of the compatibility tests performed between these systems, as well as the final design of the PACMAN validation bench.  
slides icon Slides MOOCB01 [9.553 MB]  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOOCB01  
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MOPMR022 Beam-based Alignment of CLIC Accelerating Structures Utilizing Their Octupole Component octupole, emittance, linear-collider, linac 280
 
  • J. Ögren, V.G. Ziemann
    Uppsala University, Uppsala, Sweden
  
  Alignment of the accelerating structures is essential for emittance preservation in long linear accelerators such as the Compact Linear Collider (CLIC). The prototype structures for CLIC have four radial waveguides connected to each cell for damping wakefields and this four-fold symmetry is responsible for an octupole component of the radio-frequency fields, phase-shifted 90 degrees with respect to the accelerating mode. The octupole field causes a nonlinear dependence of the transverse beam deflection with respect to the position within the accelerating structure. By transversely moving the beam with two upstream steering magnets, and observing the deflection with beam position monitors or screens, the electromagnetic center of the structure can be found. We discuss the applicability of this method for aligning the beam in the accelerating structures.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPMR022  
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MOPMW033 Acoustic Localization of RF Cavity Breakdown: Status and Progress cavity, experiment, simulation, status 470
 
  • P.G. Lane, P. Snopok, Y. Torun
    Illinois Institute of Technology, Chicago, Illinois, USA
  • A.V. Kochemirovskiy
    University of Chicago, Chicago, Illinois, USA
  
  Current designs for muon accelerators require high-gradient RF cavities to be placed in solenoidal magnetic fields. These fields help contain and efficiently reduce the phase space volume of source muons in order to create a usable muon beam for collider and neutrino experiments. It has been found that placing normal conducting RF cavities in strong magnetic fields reduces the threshold at which RF cavity breakdown occurs. To aid the effort to study RF cavity breakdown in magnetic fields, it would be helpful to have a diagnostic tool which can localize the source of breakdown sparks inside the cavity. These sparks generate thermal shocks to a small region of the inner cavity wall that can be detected and localized using microphones attached to the outer cavity surface. Presented here are the algorithms for and results from localizing simulated and experimental acoustic data from the Modular Cavity at the MuCool Test Area at Fermilab.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPMW033  
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MOPMW041 Measurements of RF Breakdowns in Beam Driven mm-Wave Accelerating Structures vacuum, electron, experiment, detector 497
 
  • M. Dal Forno, G.B. Bowden, C.I. Clarke, V.A. Dolgashev, M.J. Hogan, D.J. McCormick, A. Novokhatski, S.G. Tantawi, S.P. Weathersby
    SLAC, Menlo Park, California, USA
  • B. Spataro
    INFN/LNF, Frascati (Roma), Italy
  
  Funding: Work supported by the US DOE under contract DE-AC02-76SF00515
We studied the physics and properties of rf breakdowns in high gradient traveling-wave accelerating structures at 100 GHz. The structures are open, made of two halves with a gap in between. The rf fields were excited in the structure by an ultra-relativistic electron beam generated by the FACET facility at the SLAC National Accelerator Laboratory. We observed rf breakdowns generated in the presence of GV/m scale electric fields. We varied the rf fields excited by the FACET bunch by moving structure relative to the beam and by changing the gap between structure halves. Reliable breakdowns detectors allowed us to measure the rf breakdown rate at these different rf parameters. We measured radiated rf energy with a pyro-detector. When the beam was off-axis, we observed beam deflection in the beam position monitors and on the screen of a magnetic spectrometer. The measurements of the deflection allowed us to verify our calculation of the accelerating gradient. 		 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPMW041  
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MOPOY007 High Energy Booster Options for a Future Circular Collider at CERN injection, booster, extraction, hadron 856
 
  • L.S. Stoel, M.J. Barnes, W. Bartmann, F. Burkart, B. Goddard, W. Herr, T. Kramer, A. Milanese, G. Rumolo, E.N. Shaposhnikova
    CERN, Geneva, Switzerland
  
  In case a Future Circular Collider for hadrons (FCC-hh) is constructed at CERN, the tunnels for SPS, LHC and the 100 km collider will be available to house a High Energy Booster (HEB). The different machine options cover a large technology range from an iron-dominated machine in the 100 km tunnel to a superconducting machine in the SPS tunnel. Using a modified LHC as reference, these options are compared with respect to their energy reach, magnet technology and filling time of the collider. Potential issues with beam transfer, reliability and beam stability are presented.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPOY007  
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TUOBA03 Application of Differential Evolution Algorithm in Future Collider Optimization dynamic-aperture, sextupole, lattice, emittance 1025
 
  • Y. Zhang
    IHEP, Beijing, People's Republic of China
  • D. Zhou
    KEK, Ibaraki, Japan
  
  Funding: Project U1332108 supported by NSFC.
The dynamic aperture of is very limited due to the very small beta at IP in the SuperKEKB. In the storage ring based Higgs factory, the vertical beta function is not so small, but the much larger circumference enlarge the detuning term especially in horizontal direction. It is very hard to optimize the dynamic aperture in the future colliders. The particle loss may comes from different cause for different energy or different transverse coupling. The design of CEPC is still in process. The construction of SuperKEKB is nearly finished, but there still exist some problem which could reduce the performance. There are a few hundred parameters to be varied in the future colliders. The global optimization may be a good way to enlarge the dynamic aperture. Differential Evolution is a very simple population based, stochastic function minimizer which is very powerful at the same time. In this paper we show some application of the algorithm in the two machines. It has the potential to help us optimize the machine. 		 
slides icon Slides TUOBA03 [2.289 MB]  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUOBA03  
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TUPMB046 The Preliminary Conceptual Design of a 2k Cryogneic System for Circular Electron Positron Collider (CEPC) cryogenics, booster, cryomodule, cavity 1199
 
  • Y.P. Liu, L. Bian, R. Ge, R. Han, S.P. Li, M.J. Sang, L.R. Sun, M.F. Xu, R. Ye, J.Q. Zhang, J.H. Zhang, X.Z. Zhang, Z.Z. Zhang
    IHEP, Beijing, People's Republic of China
  
  The Circular Electron Positron Collider (CEPC) is a long-term collider project, which will serve as a Higgs Factory and offer a unique opportunity for direct searches for New Physics in the high-energy range far beyond LHC reach [1]. In the frame of this project, a large 2K cryogenic system will be built to provide coolant for superconducting cavities used in booster ring and collider ring. All the superconducting cavities will be working under 2K. This paper will give a brief introduction to the preliminary considerations of this large cryogenic system, including the general layout, heat load estimation, helium refrigerator, schematic flow diagram as well as the main parameters and working process  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMB046  
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TUPMB051 Commisioning of Facility for Assembling and Tests of Superconducting Magnets booster, dipole, quadrupole, synchrotron 1215
 
  • S.A. Kostromin, V.V. Borisov, A.M. Donyagin, A.R. Galimov, O. Golubitsky, H.G. Khodzhibagiyan, S.A. Korovkin, G.L. Kuznetsov, D. Nikiforov, A.Y. Starikov, A. Tikhomirov
    JINR, Dubna, Moscow Region, Russia
  • A.V. Kudashkin, T.E. Serochkina, A.V. Shemchuk
    JINR/VBLHEP, Dubna, Moscow region, Russia
  
  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, equipment for magnets assembly and tests are installed. Three helium satellite refrigerators with each capacity of 100 W were commissioned 2 of 6 test benches for magnets testing are assembled and commissioned. NICA booster magnets fist cryogenic tests are done. The results are discussed.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMB051  
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TUPMW001 SPPC Parameter Choice and Lattice Design dipole, lattice, proton, quadrupole 1400
 
  • F. Su
    Institute of High Energy Physics (IHEP), People's Republic of China
  • S. Bai, T.J. Bian, Y.K. Chen, J. Gao, J.Y. Tang, D. Wang, Y. Wang
    IHEP, Beijing, People's Republic of China
  
  In this paper we showed a systematic method of appropriate parameter choice for a circular pp collider by using analytical expression of beam-beam tune shift limit started from given design goal and technical limitations. Based on parameters scan, we obtain a set of parameters for SPPC with different circumferences like 54km, 78km or 100km and different energies like 70TeV or 100TeV. We also showed the first version of SPPC lattice although it needs lots of work to do and to be optimized.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMW001  
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TUPMW008 Evolution of the Beam Parameters during Luminosity Production in the Future Circular Hadron Collider emittance, luminosity, scattering, damping 1426
 
  • X. Buffat, D. Schulte
    CERN, Geneva, Switzerland
  
  The evolution of the beam parameters during luminosity production in the Future Circular Hadron Collider (FCC-hh) is described based on basic models of the effect of synchrotron radiations, intra-beam scattering, luminosity burn-off and beam-beam limitations, allowing for an estimation of the luminosity performance in different running scenarios. It is shown that a large variations of the beam parameters is expected during a cycle. Potential operational schemes adapting to these variations are considered.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMW008  
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TUPMW009 Simulation of Head-on Beam-Beam Limitations in Future High Energy Colliders emittance, simulation, synchrotron, radiation 1430
 
  • X. Buffat, T. Pieloni, C. Tambasco
    CERN, Geneva, Switzerland
  • J. Barranco, A. Florio
    EPFL, Lausanne, Switzerland
  
  The Future Circular Hadron Collider (FCC-hh) project calls for studies in a new regime of beam-beam interactions. While the emittance damping due to synchrotron radiation is still slower than in past or existing lepton colliders, it is significantly larger than in other hadron colliders. The slow reduction of the emittance is profitable for higher luminosity in term of transverse beam size at the interaction points and also to mitigate long-range beam-beam effects, potentially allowing for a reduction of the crossing angle between the beams during the operation. In such conditions, the strength of head-on beam-beam interactions increases, potentially limiting the beam brightness. 4D weak-strong and strong-strong simulations are performed in order to assess these limitations.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMW009  
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TUPMW020 Status of the Beam Optics of the Future Hadron-Hadron Collider FCC-hh dipole, optics, sextupole, closed-orbit 1470
 
  • A. Chancé
    CEA/DSM/IRFU, France
  • D. Boutin, B. Dalena, J. Payet
    CEA/IRFU, Gif-sur-Yvette, France
  • B.J. Holzer, R. Martin, D. Schulte
    CERN, Geneva, Switzerland
  
  Funding: This work was supported by the HORIZON 2020 project EuroCirCol, grant agreement 654305.
Following the recommendations of the European Strategy Group for High Energy Physics, CERN launched a design study for possible future circular collider projects, FCC, to investigate their feasibility for high energy physics research. The study covers three options, a proton-proton collider, a circular e+/e− collider and a scenario for e-p collisions to study deep inelastic scattering. The present paper describes the beam optics and the lattice design of the Future Hadron-Hadron Collider (FCC-hh). The status of the first order and second order optics of the ring will be shown for collisions at the required centre-of-mass energy of 100 TeV cm. 		 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMW020  
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TUPMW026 Feed-Forward Corrections for Tune and Chromaticity Injection Decay During 2015 LHC Operation injection, operation, hadron, octupole 1489
 
  • M. Solfaroli Camillocci, M. Juchno, M. Lamont, M. Schaumann, E. Todesco, J. Wenninger
    CERN, Geneva, Switzerland
  
  After two years of shutdown, the Large Hadron Collider (LHC) has been operated in 2015 at 6.5 TeV, close to its designed energy. When the current is stable at low field, the harmonic components of the main circuits are subject to a dynamic variation induced by current redistribution on the superconducting cables. The Field Description of the LHC (FiDel) foresaw an increase of the decay at injection of tune (quadrupolar components) and chromaticity (sextupolar components) of about 50% with respect to LHC Run1 due to the higher operational current. This paper discusses the beam-based measurements of the decay during the injection plateau and the implementation and accuracy of the feed-forward corrections as present in 2015. Moreover, the observed tune shift proportional to the circulating beam intensity and it's foreseen feed-forward correction are covered.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMW026  
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TUPMW037 Luminosity Targets for FCC-hh luminosity, hadron, proton, detector 1523
 
  • F. Zimmermann, M. Benedikt, X. Buffat, D. Schulte
    CERN, Geneva, Switzerland
  
  Funding: Supported by the European Commission under the Capacities 7th Framework Programme project EuCARD-2, grant agreement 312453, and under the HORIZON 2020 project EuroCirCol, grant agreement 654305.
We discuss the choice of target values for the peak and integrated luminosity of a future high-energy frontier circular hadron collider (FCC-hh). We review the arguments on the physics reach of a hadron collider. Next we show that accelerator constraints will limit the beam current and the turnaround time. Taking these limits into account, we derive an expression for the ultimate integrated luminosity per year, depending on a possible pile-up limit imposed by the physics experiments. We finally benchmark our result against the planned two phases of FCC-hh. 		 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMW037  
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TUPMW039 Measurement of the Total Cross Section of Gold-Gold Collisions at sqrt {sNN}=200 GeV luminosity, ion, heavy-ion, emittance 1530
 
  • W. Fischer, A.J. Baltz, M. Blaskiewicz, K.A. Drees, D.M. Gassner, Y. Luo, M.G. Minty, P. Thieberger
    BNL, Upton, Long Island, New York, USA
  • I.A. Pshenichnov
    RAS/INR, Moscow, Russia
  
  Funding: Work supported by U.S. DOE under contract No DE-AC02-98CH10886 with the U.S. Department of Energy.
Heavy ion collision cross sections totaling several hundred barns have been calculated previously for the Relativistic Heavy Ion Collider (RHIC) and the Large Hadron Collider (LHC). These total cross sections are more than one order of magnitude larger than the geometric ion-ion cross sections, primarily due to Bound-Free Pair Production (BFPP) and Electro-Magnetic Dissociation (EMD). Apart from a general interest in verifying the calculations experimentally, an accurate prediction of the losses created in the heavy ion collisions is of practical interest for RHIC and the LHC, where some collision products are lost in cryogenically cooled magnets. These losses have the potential to affect power and signal electronic devices and quench superconducing magnets. We have previously reported the total cross section measurement of U+U collisions at a center-of-mass energy of 192.8 GeV per nucleon-pair. Here we present the equivalent analysis for Au+Au collisions with the data available from a low-intensity store of RHIC Run in 2014. 		 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMW039  
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TUPMY001 Very Low Emittance Muon Beam using Positron Beam on Target positron, target, emittance, electron 1536
 
  • M. Antonelli, M.E. Biagini, M. Boscolo, A. Variola
    INFN/LNF, Frascati (Roma), Italy
  • E. Bagli
    INFN-Ferrara, Ferrara, Italy
  • G. Cavoto
    INFN-Roma, Roma, Italy
  • P. Raimondi
    ESRF, Grenoble, France
  
  Muon beams are customarily obtained via K/π decays produced in proton interaction on target. In this paper we investigate the possibility to produce low emittance muon beams from electron-positron collisions at centre-of-mass energy just above the μ+{+}μ+{-} production threshold with maximal beam energy asymmetry, corresponding to a positron beam of about 45 GeV interacting on electrons on target. Performances on both amorphous and crystal target are presented, and the general scheme for the muon production will be given. We present the main features of this scheme with a first preliminary evaluation of the performances that could be achieved by a multi-TeV muon collider.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMY001  
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TUPMY044 Carbon and Mercury Target Systems for Muon Colliders and Neutrino Factories target, proton, emittance, factory 1641
 
  • K.T. McDonald
    PU, Princeton, New Jersey, USA
  • J.S. Berg, H.G. Kirk, D. Stratakis
    BNL, Upton, Long Island, New York, USA
  • X.P. Ding
    UCLA, Los Angeles, California, USA
  
  Funding: Work supported in part by US DOE Contract NO. DE-AC02-98CH110886
A high-power target is required to convert a powerful MW-class proton beam into an intense muon source or neutrino source in support of physics at the intensity frontier. The first phase of a Muon Collider or 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 with beam and target tilted slightly to the axis of a 20-T pion-capture solenoid around the target. Using the MARS15 (2014) code, we optimized the geometric parameters of the beam and target to maximize particle production at low energies by an incoming proton beam with kinetic energy of 6.75 GeV impinging on this carbon target. We also studied beam-dump configurations to suppress the rate of undesirable high-energy secondary particles in the beam. For a possible upgrade to a proton beam of multi-MW power, we considered a free-flowing mercury jet. 		 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMY044  
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WEZA02 The NICA Project at JINR ion, detector, heavy-ion, booster 2061
 
  • G.V. Trubnikov, A.V. Butenko, V.D. Kekelidze, H.G. Khodzhibagiyan, S.A. Kostromin, V.A. Matveev, I.N. Meshkov, A.O. Sidorin, A. Sorin
    JINR, Dubna, Moscow Region, Russia
  
  The physics program and the present status of the project of NICA collider, which is under construction at JINR (Dubna), are presented. The main goal of the project is to provide ion beams for experimental studies of hot and dense strongly interacting baryonic matter and spin physics. The proposed physics program concentrates on the search for possible manifestations of the phase transitions and critical phenomena in the energy region, where the excited matter is produced with maximal achievable net baryon density, and clarification of the origin of nucleon spin. The collider will provide heavy ion collisions in the energy range of √sNN=4/11 GeV at average luminosity of L=1·1027cm−2·s−1 for 197Au79+ nuclei and polarized proton collisions in energy range of √sNN=12/27 GeV at luminosity of L≥1032cm−2·s-1. The key issue of the accelerator complex is application of sophisticated beam accumulation schemes and both stochastic and electron cooling methods. Strong space-charge effects in the collider arise a challenge to its optics and application of novel methods of beam stability maintenance.  
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DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEZA02  
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WEOCA02 First Operational Experience with an Internal Halo Target at RHIC target, operation, detector, experiment 2070
 
  • C. Montag
    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.
An internal halo target has been installed in the STAR detector at RHIC to extend the energy range towards lower energies and increase the event rates in the search for the critical point in the QCD phase diagram. We discuss geometric considerations that led to the present target layout and present first operational results. 		 
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DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEOCA02  
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WEPMB028 High HOM Damping Structure Study for CEPC cavity, HOM, damping, dipole 2183
 
  • Z.C. Liu, J. Gao, S. Jin, Y. Wang, H.J. Zheng
    IHEP, Beijing, People's Republic of China
  
  Both large circular collider such as CEPC and high current ERL facility need high HOM damping superconducting cavity. The slotted cavity is an option for such applications. It has three slotted waveguides which can highly damp the HOM and extract high HOM power out. However, the HOM absorbers for such facility are usually put outside of the cryomodule to decrease the influence of HOM power on the cryogenic system. Large slot waveguide need to make smaller transition structure to adapt this situation. A rectangular waveguide to coaxial waveguide structure was designed to the slotted cavity. In this paper, we will show the cavity HOM damping design scheme with this structure.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMB028  
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WEPMR034 Analyses of 476 MHz and 952 MHz Crab Cavities for JLAB Electron Ion Collider cavity, ion, electron, betatron 2348
 
  • H. Park, A. Castilla, S.U. De Silva, J.R. Delayen
    ODU, Norfolk, Virginia, USA
  • V.S. Morozov
    JLab, Newport News, Virginia, USA
  
  Center for Accelerator Science at ODU has designed, fabricated and successfully tested a crab cavity for MEIC at Jefferson Lab*. This proof of principle cavity was based on the earlier MEIC design which used 748.5 MHz RF system. The updated MEIC design** utilizes the components from PEP-II. It results in the change on the bunch repetition rate of stored beam to 476.3 MHz. The ion ring collider will eventually require 952.6 MHz crab cavity. This paper will present the analyses of crab cavities of both 476 MHz and 952 MHz options. It compares advantages and disadvantages of the options which provides the MEIC design team important technical information for a system down selection.
* Cryogenic Test of a 750 MHz Superconducting RF Dipole Crabbing Cavity, A. castilla et al, IPAC2014
** MEIC Design Summary, S. Abeyratne et al, arXiv:1504.07961 		 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMR034  
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WEPMW006 First Design of a Proton Collimation System for 50 TeV FCC-hh collimation, insertion, betatron, proton 2423
 
  • M. Fiascaris, R. Bruce, D. Mirarchi, S. Redaelli
    CERN, Geneva, Switzerland
  
  We present studies aimed at defining a first conceptual solution for a collimation system for the hadron-hadron option for the Future Circular Collider (FCC-hh). The baseline collimation layout is based on the scaling of the present LHC collimation system to the FCC-hh energy. It currently includes a dedicated betatron cleaning insertion as well as collimators in the experimental insertions to protect the inner triplets. An aperture model for the FCC-hh is defined and the geometrical acceptance is calculated at top energy taking into account mechanical and optics imperfections. Based on these studies the collimator settings needed to protect the machine are defined. The performance of the collimation system is then assessed with particle tracking simulation tools assuming a perfect machine.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMW006  
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WEPMW009 Towards a Mono-chromatization Scheme for Direct Higgs Production at FCC-ee emittance, luminosity, optics, synchrotron 2434
 
  • M.A. Valdivia García, F. Zimmermann
    CERN, Geneva, Switzerland
  • A. Faus-Golfe
    IFIC, Valencia, Spain
  
  Direct Higgs production in e+e− collisions at the FCC is of interest if the centre-of-mass energy spread can be reduced by at least an order of magnitude. A mono-chromatization scheme, to accomplish this, can be realized with horizontal dispersion of opposite sign for the two colliding beams at the interaction point (IP). We review approaches from historical mono-chromatization studies, then derive a set of IP parameters which would provide the required performance in FCC e+e− collisions at 63 GeV beam energy, compare these with the baseline optics parameters at neighbouring energies (45.6 and 80 GeV), comment on the effect of beamstrahlung, and, finally, discuss the modifications of the FCC-ee final-focus optics needed to obtain the required parameters.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMW009  
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WEPMW010 Effect of Beamstrahlung on Bunch Length and Emittance in Future Circular e+e− Colliders radiation, photon, emittance, synchrotron 2438
 
  • M.A. Valdivia García, F. Zimmermann
    CERN, Geneva, Switzerland
  
  In future circular e+e− colliders, beamstrahlung may limit the beam lifetime at high energies, and increase the energy spread and bunch length at low energies. If the dispersion or slop of the dispersion is not zero at the collision point, beamstrahlung will also affect the transverse emittance. In this paper, we first examine the beamstrahlung properties, and show that for the proposed FCC-ee, the radiation is fairly well modelled by the classical formulae describing synchrotron radiation in bending magnets. We then derive a set of equations describing the equilibrium beam parameters in the presence of a nonzero dispersion at the collision point. An example case from FCC-ee will serve as an illustration.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMW010  
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WEPMW012 Injection Optics for the JLEIC Ion Collider Ring quadrupole, injection, optics, ion 2445
 
  • V.S. Morozov, Y.S. Derbenev, F. Lin, F.C. Pilat, G.H. Wei, Y. Zhang
    JLab, Newport News, Virginia, USA
  • Y. Cai, Y. Nosochkov, M.K. Sullivan, M.-H. Wang
    SLAC, Menlo Park, California, USA
  
  Funding: * Work supported by the U.S. DOE Contract DE-AC02-76SF00515. ** Authored by Jefferson Science Associates, LLC under U.S. DOE Contracts No. DE-AC05-06OR23177 and DE-AC02-06CH11357.
The Jefferson Lab Electron-Ion Collider (JLEIC) will accelerate protons and ions from 8 GeV to 100 GeV. A very low beta function at the Interaction Point (IP) is needed to achieve the required luminosity. One consequence of the low beta optics is that the beta function in the final focusing (FF) quadrupoles is extremely high. This leads to a large beam size in these magnets as well as strong sensitivity to errors which limits the dynamic aperture. These effects are stronger at injection energy where the beam size is maximum, and therefore very large aperture FF magnets are required to allow a large dynamic aperture. A standard solution is a relaxed injection optics with IP beta function large enough to provide a reasonable FF aperture. This also reduces the effects of FF errors resulting in a larger dynamic aperture at injection. We describe the ion ring injection optics design as well as a beta-squeeze transition from the injection to collision optics. 		 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMW012  
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WEPMW013 Bunch Splitting Simulations for the JLEIC Ion Collider Ring emittance, simulation, ion, synchrotron 2448
 
  • B.R.P. Gamage, T. Satogata
    ODU, Norfolk, Virginia, USA
  • T. Satogata
    JLab, Newport News, Virginia, USA
  
  We describe the bunch splitting strategies for the proposed JLEIC ion collider ring at Jefferson Lab. This complex requires an unprecedented 9:6832 bunch splitting, performed in several stages. We outline the problem and current results, optimized with ESME including general parameterization of 1:2 bunch splitting for JLEIC parameters.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMW013  
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WEPMW014 Development of the Electron Cooling Simulation Program for JLEIC electron, ion, emittance, simulation 2451
 
  • H. Zhang, J. Chen, R. Li, Y. Zhang
    JLab, Newport News, Virginia, USA
  • H. Huang, L. Luo
    ODU, Norfolk, Virginia, USA
  
  Funding: Work supported by the Department of Energy, Laboratory Directed Research and Development Funding, under Contract No. DE-AC05-06OR23177
In the JLab Electron Ion Collider (JLEIC) project the traditional electron cooling technique is used to reduce the ion beam emittance at the booster ring, and to compensate the intrabeam scattering effect and maintain the ion beam emittance during collision at the collider ring. A new electron cooling process simulation program has been developed to fulfill the requirements of the JLEIC electron cooler design. The new program allows the users to calculate the electron cooling rate and simulate the cooling process with either DC or bunched electron beam to cool either coasting or bunched ion beam. It has been benchmarked with BETACOOL in aspect of accuracy and efficiency. In typical electron cooling process of JLEIC, the two programs agree very well and we have seen a significant improvement of computational speed using the new one. Being adaptive to the modern multicore hardware makes it possible to further enhance the efficiency for computationally intensive problems. The new program is being actively used in the electron cooling study and cooler design for JLEIC. We will present our models and some simulation results in this paper. 		 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMW014  
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WEPMW019 Study of Beam Synchronization at JLEIC ion, electron, dipole, proton 2463
 
  • V.S. Morozov, Y.S. Derbenev, J. Guo, A. Hutton, Y. Zhang
    JLab, Newport News, Virginia, USA
  
  Funding: Authored by Jefferson Science Associates, LLC under U.S. DOE Contracts No. DE-AC05-06OR23177 and DE-AC02-06CH11357.
The ion collider ring of Jefferson Lab's Electron-Ion Collider (JLEIC) accommodates a wide range of ion energies, from 20 to 100 GeV for protons or from 8 to 40 GeV per nucleon for lead ions. In this medium energy range, ions are not fully relativistic, which means values of their relativistic beta are slightly below 1, leading to an energy dependence of revolution time of the collider ring. On the other hand, electrons with energy 3 GeV and above are already ultra-relativistic such that their speeds are effectively equal to the speed of light. The difference in speeds of colliding electrons and ions in JLEIC, when translated into a path-length difference necessary to maintain the same timing between electron and ion bunches, is quite large. In this paper, we explore schemes for synchronizing the electron and ion bunches at a collision point as the ion energy is varied. 		 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMW019  
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WEPMW043 Frequency Scaling Study of Crab Cavity for Future Colliders with Crab Crossing cavity, luminosity, ion, electron 2532
 
  • Y. Hao, V. Ptitsyn
    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.
Crab crossing is an essential concept in the newly proposed colliders or the upgrades. It enables crossing angles to achieve lower β* without a loss of luminosity. The frequency of the crab cavity shall be chosen with various considerations, including the luminosity degradation, emittance growth due to synchro-beta resonances and RF noises. We use the figure of merits and related simulation to establish the frequency scaling relations with important beam parameters, which guide the choice of crab cavity frequency for new designs. 		 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMW043  
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WEPMY010 Considerations for a Drive Beam Scheme for a Plasma Wakefield Linear Collider plasma, kicker, linac, lattice 2565
 
  • J. Pfingstner, E. Adli, C.A. Lindstrøm
    University of Oslo, Oslo, Norway
  • E. Marín, D. Schulte
    CERN, Geneva, Switzerland
  
  The potential for high average gradients makes plasma wakefield acceleration (PWFA) an attracting option for future linear colliders. For a beam-driven PWFA collider a sequence of cells has to be supplied with synchronised drive beam bunches. This paper is concerned with the generation, transport and distribution of these drive beam bunches in a so-called drive beam complex for a 3 TeV collider. Based on earlier concepts, several modifications are suggested. The new design includes a superconducting linac and an optimised bunch delay system with a tree structure. To verify the feasibility for the overall complex, a lattice design and tracking studies for the critical bending arc subsystem are presented. Also the feasibility of a compact bunch separation system is shown. The result of these efforts is a drive beam complex that is optimised for construction cost and power efficiency that favours unified lattice solutions.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMY010  
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WEPOR015 Introduction to WPS System Designed to Measure the Change of Location for PAL-XFEL Girder electron, alignment, linear-collider, electronics 2693
 
  • H. J. Choi, K.H. Gil, H.-S. Kang, H.-G. Lee, S.B. Lee, K.W. Seo
    PAL, Pohang, Kyungbuk, Republic of Korea
  
  To maintain stable electron beam parameters (Energy 10GeV, Charge 200pC, Bunch Length 60fs, Emittance X/Y 0.481um/0.256um), PAL-XFEL equipment should keep the alignment of accelerator (±100um) and undulator (±50um) constant. To ensure the precise measurement and alignment of PAL-XFEL, GPS-based surface geodetic network and the installation of a tunnel measurement network inside buildings was prepared and the fiducialization of major equipment was completed. After PAL-XFEL equipment is aligned, if the ground and buildings go through vertical changes during operation, tilt and misalignment of equipments (correct magnet, BPM, accelerator) will cause errors in the electron beam trajectory, which will lead to changes in the beam parameter. Hydrostatic Levelling System (HLS) was installed to measure vertical changes in buildings and the ground (sinking and uplifting) continuously and systematically, and Wire Position System (WPS) installed to measure changes in Girder. This paper introduces the operation principle, design concept, installation status, and operation status of WPS.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPOR015  
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WEPOY004 Integrated Green Function for Charged Particle moving along Bending Orbit radiation, synchrotron, synchrotron-radiation, simulation 2997
 
  • K. Ohmi, S. Chen
    KEK, Ibaraki, Japan
  • H. Tanaka
    RIKEN SPring-8 Center, Sayo-cho, Sayo-gun, Hyogo, Japan
  
  Electro-magnetic field for moving charged particle is given by Liennard-Wiechert potential. The field contains high frequency component corresponding to synchrotron light, ω=3cγ3/(2ρ). The frequency is too high to study beam behavior generally. Green function integrated over beam distribution and/or over in a region σx/nx× σy/ny× σz/nz (nxyz ∼  10) is useful to study instability and emittance growth of the beam. The green function is regarded as the wake field for coherent synchrotron radiation in three dimension space.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPOY004  
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WEPOY046 Beam Delivery Simulation: BDSIM - Automatic Geant4 Models of Accelerators simulation, background, detector, radiation 3098
 
  • L.J. Nevay, S.T. Boogert, L.C. Deacon, S.M. Gibson, R. Kwee-Hinzmann, W. Shields, J. Snuverink
    JAI, Egham, Surrey, United Kingdom
  • H. Garcia
    CERN, Geneva, Switzerland
  
  Beam Delivery Simulation (BDSIM) is a program that uses a suite of high energy physics software including Geant4, CLHEP & ROOT, that seamlessly tracks particles through accelerators and detectors utilising the full range of particles and physics processes from Geant4. BDSIM has been used to simulate linear colliders such as the International Linear Collider (ILC) and more recently, circular colliders such as the Large Hadron Collider (LHC). The latest developments including improved geometry modelling; external geometry support; process biasing; and a new event display are presented. A significantly revised and improved accompanying tool chain is presented comprising of a series of Python utilities that allow efficient and automatic preparation of models. Furthermore, a library for both ROOT and Python that provides powerful analysis and event viewing after simulation is demonstrated.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPOY046  
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THPMR042 Design Guidelines for the Injector Complex of the FCC-ee injection, linac, booster, optics 3488
 
  • Y. Papaphilippou, F. Zimmermann
    CERN, Geneva, Switzerland
  • M. Aiba
    PSI, Villigen PSI, Switzerland
  • K. Oide
    KEK, Ibaraki, Japan
  • L. Rinolfi
    JUAS, Archamps, France
  • D.B. Shwartz
    BINP SB RAS, Novosibirsk, Russia
  
  The design of the injector of the FCC-ee, a high-luminosity e+/e− circular collider of 100 km in the Geneva area, is driven by the required particle flux for ring filling or top-up and for a variety of energies, from 45.5 to 175 GeV. In this paper, a set of parameters of the injector complex is presented, fulfilling the collider needs for all running scenarios. In particular, the challenges of the booster ring design are detailed, focusing on issues of optics, layout, low bending fields, injection schemes to the collider for maximizing transfer efficiency and synchrotron radiation handling.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMR042  
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THPMR046 Advanced BBA Techniques for the Final Focuses of Future Linear Colliders luminosity, sextupole, linear-collider, alignment 3504
 
  • J. Snuverink, A. Latina, D. Schulte, R. Tomás
    CERN, Geneva, Switzerland
  • R.M. Bodenstein
    JAI, Oxford, United Kingdom
  
  Tuning the Final-Focus System of future linear colliders is one of the open challenges the linear collider community is undertaking. Future colliders like ILC and CLIC will feature complex lattice design to focus the beams to nanometer level at the Interaction Point. Standard Beam-Based Alignment (BBA) techniques have proven to hardly meet the requirements in terms of acceptable emittance growth, in both machines. A set of new techniques, respectively called: nonlinear Dispersion-Free Steering (DFS), DFS-knobs scan, and hybrid DFS-knobs with beamsize measurements, have been put in place to cope with the challenge. This paper will reveal the key ideas behind the new techniques, and compare their effectiveness w.r.t. the conventional BBA tuning procedures.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMR046  
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THPMR047 Two-beam Tuning in the CLIC BDS luminosity, sextupole, linear-collider, simulation 3508
 
  • J. Snuverink, R.M. Bodenstein
    JAI, Egham, Surrey, United Kingdom
  • R. Tomás
    CERN, Geneva, Switzerland
  
  Beam tuning in the beam delivery system (BDS) is one of the major challenges for the future linear colliders. In those colliders, due to fast detuning of the final focus optics both beamlines will need to be tuned simultaneously. An initial two-beam tuning study for the Compact Linear Collider (CLIC) BDS had been performed, but was not fully satisfactory. In this paper a more extensive study is presented, as well as several improvements to the tuning algorithm. A comparative study between two competing CLIC final focus systems (FFS), the traditional and the compact FFS, will be discussed.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMR047  
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THPMR053 Influence of Magnet Multipole Field Components on Beam Dynamics in the JLEIC Ion Collider Ring multipole, dynamic-aperture, ion, dipole 3525
 
  • G.H. Wei, F. Lin, V.S. Morozov, F.C. Pilat, Y. Zhang
    JLab, Newport News, Virginia, USA
  • Y. Nosochkov, M.-H. Wang
    SLAC, Menlo Park, California, USA
  
  Funding: Authored by Jefferson Science Associates, LLC under U.S. DOE Contracts No. DE-AC05-06OR23177 and DE-AC02-06CH11357. Work supported also by the U.S. DOE Contract DE-AC02-76SF00515.
To get a luminosity level of a few 1033 cm-2ses−1 at all design points of the Jefferson Lab Electron Ion Collider (JLEIC) project, small β* values in both horizontal and vertical planes are necessary at the Interaction Point (IP) in the ion collider ring. This also means large β in the final focus area, chromaticity correction sections, etc. which sets a constraint on the field quality of magnets in large beta areas, in order to ensure a large enough dynamic aperture (DA). In this context, limiting multipole field components of magnets are surveyed to find a possible compromise between the requirements and what can be realistically achieved by a magnet manufacturer. This paper describes that work. Moreover, non-linear field dedicated correctors are also studied to provide semi-local corrections of specific multipole field components. 		 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMR053  
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THPMR054 Error Correction for the JLEIC Ion Collider Ring quadrupole, dynamic-aperture, closed-orbit, ion 3528
 
  • G.H. Wei, F. Lin, V.S. Morozov, F.C. Pilat, Y. Zhang
    JLab, Newport News, Virginia, USA
  • Y. Nosochkov, M.-H. Wang
    SLAC, Menlo Park, California, USA
  
  Funding: Authored by Jefferson Science Associates, LLC under U.S. DOE Contracts No. DE-AC05-06OR23177 and DE-AC02-06CH11357. Work supported also by the U.S. DOE Contract DE-AC02-76SF00515.
The sensitivity to misalignment, magnet strength error, and BPM noise is investigated in order to specify design tolerances for the ion collider ring of the Jefferson Lab Electron Ion Collider (JLEIC) project. Those errors, including horizontal, vertical, longitudinal displacement, roll error in transverse plane, strength error of main magnets (dipole, quadrupole, and sextupole), BPM noise, and strength jitter of correctors, cause closed orbit distortion, tune change, beta-beat, coupling, chromaticity problem, etc. These problems generally reduce the dynamic aperture at the Interaction Point (IP). According to real commissioning experiences in other machines, closed orbit correction, tune matching, beta-beat correction, decoupling, and chromaticity correction have been done in the study. Finally, we find that the dynamic aperture at the IP is restored. This paper describes that work. 		 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMR054  
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THPMW032 Measurements on Magnetic Cores for Inductive Adders with Ultra-Flat Output Pulses for CLIC DR Kickers kicker, flattop, damping, emittance 3619
 
  • J. Holma, M.J. Barnes, L. Ducimetière
    CERN, Geneva, Switzerland
  
  The CLIC study is investigating the technical feasibility of an electron-positron collider with high luminosity and a nominal centre-of-mass energy of 3 TeV. The CLIC pre-damping rings and damping rings (DRs) will produce ultra-low emittance beam with high bunch charge. To avoid beam emittance increase, the DR kicker systems must provide extremely flat, high-voltage, pulses. The specifications for the DR extraction kickers call for 160 ns duration flattop pulses of ±12.5 kV, with a combined ripple and droop of not more than ±0.02 % (±2.5 V). An inductive adder is a very promising approach to meet the specifications. Two five layer, 3.5 kV, prototype inductive adders have been built at CERN, and used to test passive and active analogue modulation methods to compensate droop and ripple of the output pulses. Recently, magnetic core materials and full-scale magnetic cores have been evaluated for the 12.5 kV prototype inductive adders. These results are presented in this paper and conclusions are drawn concerning the design of the full-scale prototypes.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMW032  
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THPOR001 Tolerance Studies and Dispersion Free Steering for Extreme Low Emittance in the FCC-ee Project emittance, lattice, sextupole, interaction-region 3759
 
  • S. Aumon, A. Doblhammer, B. Härer, B.J. Holzer
    CERN, Geneva, Switzerland
  • B. Härer
    KIT, Karlsruhe, Germany
  • K. Oide
    KEK, Ibaraki, Japan
  
  The FCC-ee study is investigating the design of a 100 km e+/e− circular collider for precision measurements and rare decay observations in the range of 90 to 350 GeV center of mass energy with luminosities in the order of 1035 cm-2s-1. In order to reach such performances, an extreme focusing of the beam is required in the interaction regions with a low vertical beta function of 2 mm at the IP. Moreover, the FCC-ee physics program requires very low emittances never achieved in a collider with 2 nm for εx and 2 pm for εy, reducing the coupling ratio to 1/1000. With such requirements, any field errors and sources of coupling will introduce spurious vertical dispersion which degrades emittances, limiting the luminosity of the machine. This paper describes the tolerance study and the impact of errors will affect the vertical emittance. In order to preserve the FCC-ee performances, in particular εy, a challenging correction scheme is proposed to keep the coupling and the vertical emittance as low as possible.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOR001  
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THPOR002 Chromaticity Compensation Schemes for the Arc Lattice of the FCC-ee Collider sextupole, quadrupole, lattice, optics 3763
 
  • B. Härer
    KIT, Karlsruhe, Germany
  • A. Doblhammer, B.J. Holzer
    CERN, Geneva, Switzerland
  
  FCC-ee is an 100 km e+/e− collider that is being designed within the Future Circular Collider Study organised by CERN. It's layout is optimised for precision studies and rare decay observations in the range of 90 to 350 GeV center of mass energy with luminosities in the order of 1035 cm-2s-1. Extremely small vertical beta functions of 1 - 2 mm are required at the two interaction points to reach this goal. The strong focusing required in the final doublet quadrupoles drives the chromaticity to more than -2000 units, far beyond the values that had been achieved in previous storage rings. As a consequence a pure linear chromaticity compensation scheme will not be sufficient to obtain the required ± 2 % energy acceptance. A state of the art multi-family sextupole scheme will have to be combined with a local chromaticity correction. This paper presents the design of the arc lattice, optimised for highest momentum acceptance and the results of systematic studies of the sextupole scheme in the arcs in order to gain highest chromaticity performance.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOR002  
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THPOR015 CEPC Bunch Lengthening and Cavity HOM Analysis HOM, resonance, cavity, factory 3805
 
  • H.J. Zheng, J. Gao, Y. Wang
    IHEP, Beijing, People's Republic of China
  
  In this paper we will show the higher order mode (HOM) analysis of the cavity for the Circular Electron-Positron Collider (CEPC) partial double ring (PDR) scheme. In order to study the single bunch longitudinal instability in CEPC, bunch lengthening and energy spread are estimated based on Gao's theory. Different models are used to study the bunch lengthening and energy spread of the ring.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOR015  
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THPOR017 Dynamic Aperture Optimization at CEPC with Pretzel Orbit lattice, dynamic-aperture, dipole, quadrupole 3808
 
  • H. Geng, S. Bai, X. Cui, Z. Duan, J. Gao, Y.Y. Guo, Y.M. Peng, Q. Qin, D. Wang, N. Wang, Y. Wang, G. Xu, Y. Yue, Y. Zhang
    IHEP, Beijing, People's Republic of China
  • W. Chou
    Fermilab, Batavia, Illinois, USA
  • F. Su
    Institute of High Energy Physics (IHEP), People's Republic of China
  
  A preliminary design of the CEPC ring with pretzel orbit will be presented. The ring and pretzel orbit will be designed for 50 bunches, as required in the CEPC Pre-CDR. The linear optics, as well as the non-linear chromaticity compensation with the presence of pretzel orbit will be described. Different phase advance difference between the long and short straight sections, have been tried to optimize the dynamic aperture, the results will be shown in this paper.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOR017  
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THPOR024 Electrical Power Budget for FCC-ee cavity, klystron, operation, cryogenics 3828
 
  • F. Zimmermann, S. Aull, M. Benedikt, D. Bozzini, O. Brunner, J.-P. Burnet, A.C. Butterworth, R. Calaga, E. Jensen, V. Mertens, A. Milanese, M. Nonis, N. Schwerg, L.J. Tavian, J. Wenninger
    CERN, Geneva, Switzerland
  • A.P. Blondel, M. Koratzinos
    DPNC, Genève, Switzerland
  • Sh. Gorgi Zadeh
    Rostock University, Faculty of Computer Science and Electrical Engineering, Rostock, Germany
  • K. Oide
    KEK, Ibaraki, Japan
  • L. Rinolfi
    JUAS, Archamps, France
  
  Funding: Supported by the European Commission under the Capacities 7th Framework Programme project EuCARD-2, grant agreement 312453.
We present a first rough estimate for the electrical power consumption of the FCC-ee lepton collider. This electrical power is dominated by the RF system, which provides the motivation for the ongoing R&D on highly efficient RF power sources. Other contributions come from the warm arc magnets, the cryogenics systems, cooling, ventilation, general services, the particle-physics detectors, and the injector complex. 		 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOR024  
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THPOR025 Wedge Absorbers for Final Cooling for a High-Energy High-Luminosity Lepton Collider emittance, experiment, optics, betatron 3832
 
  • D.V. Neuffer
    Fermilab, Batavia, Illinois, USA
  • T.A. Mohayai
    IIT, Chicago, Illinois, USA
  • P. Snopok
    Illinois Institute of Technology, Chicago, Illinois, USA
  • D.J. Summers
    UMiss, University, Mississippi, USA
  
  Funding: Fermilab is operated by Fermi Research Alliance, LLC under Contract No. De-AC02-07CH11359 with the U. S. Department of Energy.
A high-energy high-luminosity muon collider scenario requires a "final cooling" system that reduces transverse emittance to ~25 microns (normalized) while allowing longitudinal emittance increase. Ionization cooling using high-field solenoids (or Li Lens) can reduce transverse emittances to ~100 microns in readily achievable configurations, confirmed by simulation. Passing these muon beams at ~100 MeV/c through cm-sized diamond wedges can reduce transverse emittances to ~25 microns, while increasing longitudinal emittance by a factor of ~5. Implementation will require optical matching of the exiting beam into downstream acceleration systems. 		 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOR025  
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THPOR026 Change Management at the International Linear Collider ILC detector, linear-collider, site, controls 3835
 
  • B. List, L. Hagge, N. Walker
    DESY, Hamburg, Germany
  
  The Linear Collider Collaboration has introduced a change management process to ensure that changes to the ILC baseline design are properly reviewed and implemented in an orderly fashion. A change management board oversees the process, establishes the review procedure based on the overall impact of the proposed change, decides, and monitors the implementation. This change management process has become an important factor that gives structure and direction to the ongoing design activities around the world. For example, one CR called for a harmonisation of the final focus quadrupole position between the two detector concepts; extensive studies from both experiments were carried out as part of the review process and took almost a year. Another CR by the experiments asked for a vertical shaft access to the interaction hall that required a relocation of the whole accelerator. The change process made sure that the stakeholders were part of the review and decision process from the beginning and contributed to a design change acceptable to all parties involved. The poster will present the change management process and give examples of change requests that have already been processed.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOR026  
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THPOR028 Numerical Analysis of Stresses for the Target of the ILC 300 Hz Conventional Positron Source target, positron, simulation, linear-collider 3838
 
  • S. Jin, J. Gao
    IHEP, Beijing, People's Republic of China
  • T. Omori
    KEK, Ibaraki, Japan
  • P. Sievers
    CERN, Geneva, Switzerland
  
  A 300Hz conventional, e- driven positron source for the ILC is proposed by an international team. In this paper, we focus on numerical analysis of dynamic stresses in the Tungsten target. These are driven by the pulsed e-beam, which causes rapid heating and subsequent, dynamic loads in the target which can lead to fracture and failure of it. A program of ANSYS workbench is used in the study. The dynamic stresses from both of extremely short (10 ns) and nominal (1μs) thermal pulses are systematically studied in various target related parts such as small spheres, cylinders. Particular attention has also been paid to the buckling of foils.
(*) The first proposal was published in NIMA 672 (2012) 52-56 by
T. Omori, et. al.. The authors come from seven institutes including KEK, Hiroshima U., DESY, ANL, IHEP, SOKENDAI, U. of Hamburg 		 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOR028  
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THPOR033 Integration and Testing of 3 Consecutive CLIC Two-Beam Modules vacuum, alignment, operation, feedback 3856
 
  • A.L. Vamvakas, M. Aicheler, S. Döbert, M. Duquenne, H.M. Durand, M. Sosin, J.I. Väinölä
    CERN, Geneva, Switzerland
  • V. Rude
    ESGT-CNAM, Le Mans, France
  
  CLIC (Compact LInear Collider) is a study of a 50 km long linear electron-positron collider, consisting of ap-proximately 20,000 repetitive 2 m long modules. Micron level manufacturing and alignment tolerances are re-quired for the RF and magnet components due to the nanometre beam size and luminosity goal. The effect of thermal, vacuum and mechanical loads needs to be as-sessed, both in transient and in steady state conditions. The dynamic behaviour of mock-ups was investigated on the prototype two-beam module. Two additional two-beam modules are installed to further investigate the interconnections between them, in a machine-like envi-ronment. The array of three consecutive modules allows for alignment tests of the module sequence, while thermal and vacuum tests can be executed simultaneously. A transportation experiment is foreseen, investigating the feasibility of installing prealigned modules. Finally, new design of components is being tested, based on the expe-rience gathered from the first module and leading to a new generation module.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOR033  
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THPOR047 Preliminary Concept and Key Technologies of HIEPA Accelerator synchrotron, luminosity, brightness, emittance 3895
 
  • Z.R. Zhou, Q. Luo, L. Wang, W. Xu, B. Zhang
    USTC/NSRL, Hefei, Anhui, People's Republic of China
  
  Funding: Supported by National Natural Science Foundation of China (11375178 and 11575181) and the Fundamental Research Funds for the Central Universities, Grant No WK2310000046
High energy physicists proposed a new collider: super tau-charm factory. The name of the project is high intensity electron positron accelerator facility. As high intensity electron positron collider, it runs in an energy range of 2-7 GeV. As an advanced light source, it can also provide high quality synchrotron radiation from VUV to soft X-ray. The facility will be a symmetrical two-ring collider located at Hefei. This paper shows preliminary conception of the storage rings. 		 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOR047  
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THPOR049 Considerations for the Injection and Extraction Kicker Systems of a 100 TeV Centre-of-Mass FCC-hh Collider kicker, extraction, injection, impedance 3901
 
  • T. Kramer, M.J. Barnes, W. Bartmann, F. Burkart, L. Ducimetière, B. Goddard, V. Senaj, T. Stadlbauer, D.G. Woog
    CERN, Geneva, Switzerland
  • D. Barna
    Wigner Research Centre for Physics, Institute for Particle and Nuclear Physics, Budapest, Hungary
  
  A 100 TeV center-of-mass energy frontier proton collider in a new tunnel of ~100 km circumference is a central part of CERN's Future Circular Colliders (FCC) design study. One of the major challenges for such a machine will be the beam injection and extraction. This paper outlines the recent developments on the injection and extraction kicker system concepts. For injection the system requirements and progress on a new inductive adder design will be presented together with first considerations on the injection kicker magnets. The extraction kicker system comprises the extraction kickers itself as well as the beam dilution kickers, both of which will be part of the FCC beam dump system and will have to reliably abort proton beams with stored energies in the range of 8 Gigajoule. First concepts for the beam dump kicker magnet and generator as well as for the dilution kicker system are described and its feasibility for an abort gap in the 1 μs range is discussed. The potential implications on the overall machine and other key subsystems are outlined, including requirements on (and from) dilution patterns, interlocking, beam intercepting devices and insertion design.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOR049  
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THPOY041 CERN Beam Interlock Redundant Dump Trigger Module Performance during LHC Run 2 operation, dumping, extraction, radiation 4189
 
  • D.O. Calcoen, S. Gabourin, A.P. Siemko
    CERN, Geneva, Switzerland
  
  During the Long Shutdown 1 an additional link between the Beam Interlocks System and the LHC Beam Dumping System was installed. This third channel is a direct access from the BIS to the asynchronous dump triggering lines. This paper describes the experience collected for the first 10 months of operation and the improvements proposed for a future upgrade of the module.
IPAC 2014 THPRI021 		 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOY041  
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