Keyword: collider
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MOXBA01 Challenges for Circular e+e− Colliders electron, operation, luminosity, positron 7
 
  • F. Zimmermann
    CERN, Meyrin, Switzerland
  
  Funding: This work was supported by the European Commission under the HORIZON 2020 project ARIES no.~730871.
This paper sketches the glorious past and the tantalizing future of circular e+e− colliders, highlighting some of the key issues. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2018-MOXBA01  
About • paper received ※ 13 October 2018       paper accepted ※ 19 February 2019       issue date ※ 21 April 2019  
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MOYAA02 Status of DAΦNE: from KLOE-2 to SIDDHARTA-2 Experiment with Crab-Waist luminosity, detector, experiment, operation 23
 
  • C. Milardi, D. Alesini, S. Bini, O.R. Blanco-García, M. Boscolo, B. Buonomo, S. Cantarella, S. Caschera, A. D’Uffizi, A. De Santis, G.O. Delle Monache, D.G.C. Di Giulio, G. Di Pirro, A. Drago, L.G. Foggetta, A. Gallo, R. Gargana, A. Ghigo, S. Guiducci, S. Incremona, F. Iungo, C. Ligi, M. Maestri, A. Michelotti, L. Pellegrino, R. Ricci, U. Rotundo, L. Sabbatini, C. Sanelli, G. Sensolini, A. Stecchi, A. Stella, A. Vannozzi, M. Zobov
    INFN/LNF, Frascati, Italy
  • G. Castorina
    INFN-Roma1, Rome, Italy
  • J. Chavanne, G. Le Bec, P. Raimondi
    ESRF, Grenoble, France
  
  Dafne, the Italian lepton collider, is running since more than a decade thanks to a radical revision of the approach used to deal with the beam-beam interaction: the Crab-Waist collision scheme. In this context, the collider has recently completed a long term activity program aimed at providing an unprecedented sample of data to the KLOE-2 detector, a large experimental apparatus including a high intensity solenoidal field strongly perturbing ring optics and beam dynamics. The KLOE-2 run has been undertaken with the twofold intend of collecting data for rare decay flavor physics studies, and testing the effectiveness of the new collision scheme in the presence of a strongly perturbing experimental apparatus. The performances of the collider are reviewed and the limiting factors discussed along with the preparatory phase activities planned to secure a new collider run to the SIDDHARTA-2 experiment.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2018-MOYAA02  
About • paper received ※ 20 October 2018       paper accepted ※ 19 February 2019       issue date ※ 21 April 2019  
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MOYAA05 The Status of CEPC injection, booster, operation, luminosity 30
 
  • C.H. Yu, S. Bai, T.J. Bian, X. Cui, J. Gao, H. Geng, D.J. Gong, D. Ji, Y.D. Liu, C. Meng, Q. Qin, D. Wang, N. Wang, Y. Wang, Y. Wei, J.Y. Zhai, Y. Zhang, H.J. Zheng, Y.S. Zhu
    IHEP, Beijing, People’s Republic of China
  
  Circular electron-positron collider (CEPC) is a dedi-cated project proposed by China to research the Higgs boson. The collider ring provides e+ e− collision at two interaction points (IP). The luminosity for the Higgs mode at the beam energy of 120GeV is 3*1034 cm-2s-1 at each IP while the synchrotron radiation (SR) power per beam is 30MW. Furthermore, CEPC is compatible with W and Z experiments, for which the beam ener-gies are 80 GeV and 45.5 GeV respectively. The lumi-nosity at the Z mode is higher than 1.7*1035 cm-2s-1 per IP. Top-up operation is available during the data taking of high energy physics. The status of CEPC will be introduced in detail in this paper.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2018-MOYAA05  
About • paper received ※ 23 September 2018       paper accepted ※ 08 March 2019       issue date ※ 21 April 2019  
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MOYBA01 Round Colliding Beams at Vepp-2000 with Extreme Tuneshifts luminosity, positron, electron, emittance 34
 
  • D.B. Shwartz, V.V. Anashin, O.V. Belikov, D.E. Berkaev, K. Gorchakov, A.S. Kasaev, A.N. Kirpotin, I. Koop, A.A. Krasnov, G.Y. Kurkin, A.P. Lysenko, S.V. Motygin, E. Perevedentsev, V.P. Prosvetov, D.V. Rabusov, Yu. A. Rogovsky, A.M. Semenov, A.I. Senchenko, D.N. Shatilov, P.Yu. Shatunov, Y.M. Shatunov, O.S. Shubina, M.V. Timoshenko, I.M. Zemlyansky, Yu.M. Zharinov
    BINP SB RAS, Novosibirsk, Russia
  • I. Koop, E. Perevedentsev, Yu. A. Rogovsky, A.I. Senchenko, Y.M. Shatunov, D.B. Shwartz
    NSU, Novosibirsk, Russia
  
  VEPP-2000 is the only electron-positron collider operating with round beams that allow to enhance beam-beam limit. VEPP-2000 with SND and CMD-3 detectors carried out two successful data-taking runs after new BINP injection complex was commissioned. The 2016/2017 run was dedicated to high energy range (640-1000 MeV per beam) while the 2017/2018 run was focused at 275-600 MeV/beam energies. With sufficient positron production rate and upgraded full-energy booster the collider luminosity was limited by beam-beam effects, namely flip-flop effect. Thorough machine tuning together with new ideas introduced to suppress flip-flop allowed to achieve high beam-beam tuneshift and bunch-by-bunch luminosity values at specific beam energies. The achieved luminosity increased 2-5 times in a whole energy range in comparison to phase-1 operation (2010-2013).  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2018-MOYBA01  
About • paper received ※ 11 October 2018       paper accepted ※ 19 February 2019       issue date ※ 21 April 2019  
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MOYBA04 Report from ARIES Muon Collider Workshop in Padua factory, positron, target, emittance 41
 
  • F. Zimmermann
    CERN, Meyrin, Switzerland
  • M. Zanetti
    INFN- Sez. di Padova, Padova, Italy
  
  Funding: This work was supported by the European Commission under the HORIZON 2020 project ARIES no.~730871.
Several novel concepts could help the muon collider become a reality. These concepts include parametric ionization cooling, low-emittance muon production by positron annihilation (LEMMA scheme), production of low-emittance muon or positron beams using the Gamma Factory concept, and strategies to upgrade large accelerator complexes, like the LHC or the FCC, into a highest-energy muon collider. The muon collider workshop organized by ARIES APEC at Padua in July 2018 gathered the international community in order to review the recent progress and to formulate a common R\&D strategy. Several important conclusions and recommendations were drawn. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2018-MOYBA04  
About • paper received ※ 13 October 2018       paper accepted ※ 19 February 2019       issue date ※ 21 April 2019  
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TUOBB03 Progress of Preliminary Work for the Accelerators of a 2-7GeV Super Tau Charm Facility at China factory, positron, electron, luminosity 76
 
  • Q. Luo
    USTC/NSRL, Hefei, Anhui, People’s Republic of China
  
  Funding: Work supported by National Natural Science Foundation of China U1832169 and the Fundamental Research Funds for the Central Univer-sities, Grant No WK2310000046
As the most successful tau-charm factory of the world, BEPC II will celebrate its 10th birthday this year and will finish its historical mission in the next decade. Because of its very important role in high energy phys-ics study, BEPC II will certainly need a successor, a new tau-charm collider. This paper discusses the feasi-bility of a greenfield next generation tau-charm collid-er named HIEPA. The luminosity of this successor is about 5×1034 cm−2s−1 pilot and 1×1035cm-2s−1 nominal, with the electron beam longitudinally polarized at the IP. The general scheme of the accelerators and the beam parameters are shown. Several key technologies such as beam polarization and beam emittance diag-nostics are also discussed. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2018-TUOBB03  
About • paper received ※ 16 October 2018       paper accepted ※ 19 February 2019       issue date ※ 21 April 2019  
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TUYBA02 Beam-beam Effects at High Energy e+e− Colliders luminosity, resonance, betatron, ECR 106
 
  • D.N. Shatilov
    BINP SB RAS, Novosibirsk, Russia
  
  Funding: Russian Science Foundation, project N14-50-00080.
One of the main requirements for future e+e− colliders is high luminosity. If the energy per beam does not exceed 200 GeV, the optimal choice will be a circular collider with "crab waist" collision scheme. Here, to achieve maximum luminosity, the beams should have a very high density at the IP. For this reason, radiation in the field of a counter bunch (BS - beamstrahlung) becomes an appreciable factor affecting the dynamics of particles. In particular, in the simulation for FCC-ee, new phenomena were discovered: 3D flip-flop and coherent X-Z instability. The first is directly related to BS. The second can manifest itself at low energy (where BS is negligible), but at high energies BS substantially changes the picture. In the example of FCC-ee, we will consider the features of beam-beam interaction at high-energy crab waist colliders, and optimization of parameters for high luminosity. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2018-TUYBA02  
About • paper received ※ 19 October 2018       paper accepted ※ 19 February 2019       issue date ※ 21 April 2019  
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TUPAB03 Overall Injection Strategy for FCC-ee emittance, linac, booster, wiggler 131
 
  • S. Ogur, F. Antoniou, T.K. Charles, B. Härer, B.J. Holzer, Y. Papaphilippou, L. Rinolfi, T. Tydecks, F. Zimmermann
    CERN, Geneva, Switzerland
  • M. Aiba
    PSI, Villigen PSI, Switzerland
  • A.M. Barnyakov, A.E. Levichev, P.V. Martyshkin, D.A. Nikiforov
    BINP SB RAS, Novosibirsk, Russia
  • I. Chaikovska, R. Chehab
    LAL, Orsay, France
  • O. Etisken
    Ankara University, Faculty of Sciences, Ankara, Turkey
  • K. Furukawa, N. Iida, T. Kamitani, F. Miyahara
    KEK, Ibaraki, Japan
  • E.V. Ozcan
    Bogazici University, Bebek / Istanbul, Turkey
  • S.M. Polozov
    MEPhI, Moscow, Russia
  
  The Future Circular electron-positron Collider (FCC-ee) requires fast cycling injectors with very low extraction emittances to provide and maintain extreme luminosities at center of mass energy varying between 91.2-385 GeV in the collider. For this reason, the whole injector complex table is prepared by putting into consideration the minimum fill time from scratch, bootstrapping, transmission efficiency as well as store time of the beams in synchrotrons to approach equilibrium emittances. The current injector baseline contains 6 GeV S-band linac, a damping ring at 1.54 GeV, a prebooster to accelerate from 6 to 20 GeV, which is followed by 98-km top up booster accelerating up to final collision energies. Acceleration from 6 GeV to 20 GeV can be provided either by Super Proton Synchrotron (SPS) of CERN or a new synchrotron or C-Band linac, distinctively, which all options are retained. In this paper, the current status of the whole FCC-ee injector complex and injection strategies are discussed.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2018-TUPAB03  
About • paper received ※ 20 October 2018       paper accepted ※ 19 February 2019       issue date ※ 21 April 2019  
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TUPAB05 An On-axis Injection Design for CEPC injection, booster, dynamic-aperture, damping 143
 
  • X. Cui, C.H. Yu, J.Y. Zhai, Y. Zhang
    IHEP, Beijing, People’s Republic of China
  
  Considering the requirement on the dynamic aperture in the main collider, an on-axis injection method is need-ed for the Higgs energy at CEPC. A swap-out on-axis injection scheme using the booster as an accumulation ring is given in this paper. Some dynamical problems concerning the effectiveness of this injection scheme is also discussed.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2018-TUPAB05  
About • paper received ※ 27 September 2018       paper accepted ※ 19 February 2019       issue date ※ 21 April 2019  
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TUPAB06 Design and Beam Dynamics of the CEPC Booster booster, injection, emittance, optics 146
 
  • D. Wang, X. Cui, J. Gao, D. Ji, Y.D. Liu, C. Meng, N. Wang, C.H. Yu, J.Y. Zhai, Y. Zhang
    IHEP, Beijing, People’s Republic of China
  
  The CEPC booster needs to provide electron and positron beams to the collider at different energy with required injection speed. A 10 GeV linac is adopted as the injector for CDR. Then the beam energy is accelerated to specific energy according to three modes of CEPC collider ring (H, W and Z). The geometry of booster is designed carefully in order to share the same tunnel with collider. The design status of booster including parameters, optics and dynamic aperture is discussed in this paper.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2018-TUPAB06  
About • paper received ※ 26 September 2018       paper accepted ※ 19 February 2019       issue date ※ 21 April 2019  
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TUPBB04 Resonant Depolarization at Z and W at FCC-ee synchrotron, polarization, resonance, ECR 165
 
  • I. Koop
    BINP SB RAS, Novosibirsk, Russia
  
  Both future 100 km in circumference electron-positron colliders CEPC and FCC-ee need know beams energies with the extreme precision of 1-2 ppm. This can be done only with the help of Resonant Depolarization (RD) technique. Still, some beam parameters of these machines, like energy spread and damping decrements, are so high near 80 GeV per beam, that it is required special consideration and tricks to overcome the difficulties. The author has written simple spin tracking code, which simulates main features of the RD process in presence of continuous energy diffusion due to synchrotron radiation fluctuations. It was shown by this study, that the applicability of the RD method is limited by the effect of widening of a width of the central peak of the spin precession spectrum when the synchrotron tune is chosen too low, say below 0.05. In this case spin precession lost its resonant nature due to overlap of the wide central spectrum peak with nearby synchrotron side bands. Dependencies of the spectrum peaks width from various beam parameters and a new RD-procedure recipe are presented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2018-TUPBB04  
About • paper received ※ 12 October 2018       paper accepted ※ 19 February 2019       issue date ※ 21 April 2019  
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WEOAB04 Single Bunch Instabilities and NEG Coating for FCC-ee impedance, electron, simulation, vacuum 234
 
  • E. Belli
    Sapienza University of Rome, Rome, Italy
  • P. Costa Pinto, G. Rumolo, A. Sapountzis, T.F. Sinkovits, M. Taborelli
    CERN, Geneva, Switzerland
  • M. Migliorati
    INFN-Roma1, Rome, Italy
  • M. Zobov
    INFN/LNF, Frascati, Italy
  
  The high luminosity electron-positron collider FCC-ee is part of the Future Circular Collider (FCC) study at CERN and it has been designed to cover the beam energy range from 45.6 GeV to 182.5 GeV to study the properties of the Higgs boson and other particles. Electron cloud build up simulations on the Z resonance revealed the necessity of minimising the Secondary Electron Yield (SEY) of the pipe walls by applying a Ti-Zr-V Non-Evaporable Getter (NEG) coating in the entire ring. Beam dynamics simulations at 45.6 GeV pointed out that minimising the thickness of this layer is mandatory to reduce the resistive wall (RW) impedance, thus increasing the single bunch instability thresholds and ensuring beam stability during operation. However, reducing the coating thickness can affect the performance of the material and therefore the SEY. For this reason, an extensive measurement campaign was performed at CERN to characterise NEG thin films with thicknesses below 250 nm in terms of activation performance and SEY measurements. This paper also presents the FCC-ee longitudinal impedance model which includes all the current machine components.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2018-WEOAB04  
About • paper received ※ 12 November 2018       paper accepted ※ 19 February 2019       issue date ※ 21 April 2019  
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WEOBB05 CEPC Collider and Booster Magnets dipole, sextupole, quadrupole, booster 247
 
  • M. Yang, F.S. Chen, W. Kang, X.J. Sun, Y.S. Zhu
    IHEP, Beijing, People’s Republic of China
  
  Funding: Work supported in part by the Yifang Wang scientific Studio of the Ten Thousand Talents Project.
A Circular Electron Positron Collider (CEPC) with a circumference of about 100 km, a beam energy up to 120 GeV is proposed to be constructed in China. Most mag-nets for CEPC Booster and Collider ring are conventional magnets. The quantities of the magnets are large, so the cost and power consumption are two of the most im-portant issues for the magnet design and manufacturing. The dual aperture dipole and quadrupole magnet with low current high voltage are used in the collider ring. While in the booster the dipole magnet works at very low field, so a low packing factor dipole magnet or a coil type without iron design will be investigated and chosen. In this paper, the conceptual design of the CEPC main mag-nets are in detailed and the R&D plan is presented. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2018-WEOBB05  
About • paper received ※ 19 October 2018       paper accepted ※ 19 February 2019       issue date ※ 21 April 2019  
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WEYAA02 Large Scale Superconducting RF Production cavity, SRF, niobium, FEL 251
 
  • C. Pagani
    Università degli Studi di Milano & INFN, Segrate, Italy
  
  The efficient plug to beam power conversion promised by the use of Superconducting RF to accelerate particle beams is still the driving force to pursue the development of this technology. Once the effective gain reached the level to pay for cryogenics, big physics laboratories started to believe on SRF, investing resources and proposing large challenging projects. Since then the cooperation with industry has been crucial to transform e few lab results into reliable SRF cavities and related ancillaries. This process started in the eighties and reached the actual paradigm with the realization of the European XFEL. All the new large scale projects in construction or proposed should start from the analysis of this experience and move forward from there.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2018-WEYAA02  
About • paper received ※ 12 October 2018       paper accepted ※ 19 February 2019       issue date ※ 21 April 2019  
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WEPAB02 CEPC Civil Engineering Design site, experiment, factory, operation 264
 
  • Y. Xiao
    YREC, Zhengzhou, People’s Republic of China
  
  The CEPC is a circular e+ e− collider located in a 100 km circumference underground tunnel. Preliminary site selection and the design of the CEPC civil engineering will be introduced in this paper.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2018-WEPAB02  
About • paper received ※ 12 October 2018       paper accepted ※ 19 February 2019       issue date ※ 21 April 2019  
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WEPAB03 FCC-ee Operation Model, Availability & Performance luminosity, operation, cryomodule, injection 269
 
  • F. Zimmermann, A. Apollonio, M. Benedikt, O. Brunner, S. Myers, J. Wenninger
    CERN, Meyrin, Switzerland
  • Y. Funakoshi, K. Oide
    KEK, Ibaraki, Japan
  • C. Milardi
    INFN/LNF, Frascati, Italy
  • A. Niemi
    Tampere University of Technology, Tampere, Finland
  • Q. Qin
    IHEP, Beijing, People’s Republic of China
  • J.T. Seeman
    SLAC, Menlo Park, California, USA
  
  Funding: This work was supported by the European Commission under the HORIZON 2020 project ARIES no.~730871.
This document discusses the machine parameters and expected luminosity performance for the proposed future circular lepton collider FCC-ee. Particular emphasis is put on availability, physics run time, and efficiency. Key performance assumptions are compared with the operational experience of several past and present colliders including their injectors - LHC, LEP/LEP-2, PEP-II, KEKB, BEPCII, DAΦNE, SLC and the SPS complex. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2018-WEPAB03  
About • paper received ※ 13 October 2018       paper accepted ※ 19 February 2019       issue date ※ 21 April 2019  
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WEPAB05 Conceptional design of CEPC Cryogenic system cryogenics, cryomodule, cavity, booster 282
 
  • J.Q. Zhang, R. Han, S.P. Li
    IHEP, Beijing, People’s Republic of China
  
  The CEPC has two rings, the booster ring and the collider ring. There are 432 superconducting cavities in total. In the booster ring, there are 96 ILC type 1.3 GHz 9-cell superconducting cavities; eight of them will be packaged in one 12-m-long module. There are 12 such modules. In the collider ring, there are 240 650 MHz 2-cell cavities; six of them will be packaged in one 11-m-long module. There are 40 of them. All the cavities will be cooled in a liquid-helium bath at a temperature of 2K to achieve a good cavity quality factor. The cooling benefits from helium II thermo-physical properties of large effective thermal conductivity and heat capacity as well as low viscosity and is a technically safe and economically reasonable choice. The 2K cryostat will be protected against heat radiation by means of two thermal shields cooling with 5-8K helium as well as 40-80K helium from a refrigerator. There are 4 cryo-stations along the 100km circular collider with the physical design of double ring. Generally, each cryo-station is supplied from a common cryogenic plant, with one refrigerator and one distribution box. The cooling capacity of each refrigerator is 18kW @ 4.5K.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2018-WEPAB05  
About • paper received ※ 10 October 2018       paper accepted ※ 19 February 2019       issue date ※ 21 April 2019  
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THXBA01 Summary on Accelerator Infrastructures and Commissioning operation, luminosity, site, cryogenics 290
 
  • Y. Funakoshi
    KEK, Ibaraki, Japan
  
  In this paper, summary of the woking group on "Accelerator Infrastructures and Commissioning and Operation" is described.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2018-THXBA01  
About • paper received ※ 29 October 2018       paper accepted ※ 19 February 2019       issue date ※ 21 April 2019  
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