Keyword: injection
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MOYAA05 The Status of CEPC collider, 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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TUPAB01 KEKB Injection Developments linac, operation, controls, luminosity 121
 
  • K. Furukawa
    KEK, Ibaraki, Japan
  
  The e−/e+ SuperKEKB collider is now under commissioning. As e−/e+ beam injection for SuperKEKB greatly depends on the efforts during the previous KEKB project, the injection developments during KEKB are outlined as well as the improvements towards SuperKEKB. When KEKB was commissioned, approximately ten experimental runs per day were performed with e−/e+ injections in between. As another collider PEP-II had a powerful injector SLAC, the KEKB injector had to make a few improvements seriously, such as injection of two bunches in a pulse, continuous injection scheme, eventual simultaneous top-up injections, as well as many operational optimizations. The design of SuperKEKB further required the beam quality improvements especially in the lower beam emittance for the nano-beam scheme, as well as in the beam current for the higher ring stored current and the shorter lifetime.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2018-TUPAB01  
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 booster, collider, 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, collider, 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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TUPBB05 Beam Instrumentation at SuperKEKB timing, MMI, feedback, detector 169
 
  • G.M. Mitsuka, M. Arinaga, J.W. Flanagan, H. Fukuma, H. Ikeda, H. Ishii, S.H. Iwabuchi, K. Mori, E. Mulyani, M. Tejima, M. Tobiyama
    KEK, Ibaraki, Japan
  • G. Bonvicini
    Wayne State University, Detroit, Michigan, USA
  • E. Mulyani
    Sokendai, Ibaraki, Japan
  • G.S. Varner
    University of Hawaii, Honolulu,, USA
  
  Phase 2 commissioning of the SuperKEKB electron-positron collider has been performed with final focus optics from February 8 to July 17, 2018. The main aims of Phase 2 commissioning were to verify the novel nano-beam collision scheme and achieve the machine luminosity O(1034 cm-2s-1). The beam instruments including the bunch-by-bunch feedback and orbit feedback systems, which are central to the beam diagnostics at SuperKEKB, were successfully operated throughout Phase 2. In this talk, we will present the commissioning results focusing on beam diagnostics and show prospects for the final phase of commissioning from next spring.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2018-TUPBB05  
About • paper received ※ 26 September 2018       paper accepted ※ 19 February 2019       issue date ※ 21 April 2019  
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WEXBA06 Beam Background at SuperKEKB During Phase 2 Operation background, detector, luminosity, radiation 221
 
  • A. Paladino
    KEK, Tsukuba, Japan
  
  The SuperKEKB accelerator, the upgrade of the KEKB machine, will operate at an unprecedented instantaneous luminosity of 8x1035/cm2/s1, providing the Belle II experiment an expected integrated luminosity of about 50 inverse ab in ten years of operation. With the increased luminosity, the beam background is expected to grow significantly with respect to KEKB, leading, among other effects, to possible damage of detector components and suppression of signal events. We present studies done during the Phase 2 operation of SuperKEKB to evaluate the contribution of each background source, such as Touschek effect, beam-gas scattering, synchrotron radiation, and injection background. We also present studies performed on collimators and other solutions adopted to mitigate beam backgrounds in the interaction region.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2018-WEXBA06  
About • paper received ※ 30 September 2018       paper accepted ※ 19 February 2019       issue date ※ 21 April 2019  
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WEPAB03 FCC-ee Operation Model, Availability & Performance luminosity, operation, collider, cryomodule 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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WEPBB01 Operation of SuperKEKB in Phase 2 operation, MMI, vacuum, quadrupole 286
 
  • Y. Funakoshi, Y. Arimoto, H. Ikeda, T. Ishibashi, N. Ohuchi, S. Terui, X. Wang
    KEK, Ibaraki, Japan
  
  The Phase 2 commissioning of SuperKEKB was performed from March to July 2018. In this report, the operation statistics and the QCS quench issue which we encountered during Phase 2 are described.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2018-WEPBB01  
About • paper received ※ 20 October 2018       paper accepted ※ 19 February 2019       issue date ※ 21 April 2019  
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