Keyword: operation
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MOXBA01 Challenges for Circular e+e− Colliders collider, electron, 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, collider 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 collider, injection, booster, 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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TUOAB04 Optics Corrections including IP Local Coupling at SuperKEKB coupling, luminosity, MMI, optics 63
 
  • A. Morita, H. Koiso, K. Ohmi, Y. Ohnishi, H. Sugimoto, D. Zhou
    KEK, Ibaraki, Japan
  
  The phase-2 commissioning of the SuperKEKB accelerator with the interaction point(IP) has been performed from March 19 to July 17. In the collision operation during this commissioning, the vertical beta function at the IP was squeezed down to 3mm. In order to achieve such low beta collision operation, many optics corrections were performed. We present the result of those optics measurement and correction.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2018-TUOAB04  
About • paper received ※ 12 October 2018       paper accepted ※ 19 February 2019       issue date ※ 21 April 2019  
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TUOBB04 Different Optics within Large Energy Region at BEPCII luminosity, emittance, lattice, feedback 79
 
  • C.H. Yu, Y. Bai, C.C. Du, Z. Duan, Y.Y. Guo, D. Ji, S.C. Jiang, Y. Jiao, Y.M. Peng, Q. Qin, Y.S. Sun, S.K. Tian, J.Q. Wang, N. Wang, X. Wang, Y. Wei, Wen. Wen, J. Wu, Xing. Xing, Xu. Xu, C. Zhang, Y. Zhang
    IHEP, Beijing, People’s Republic of China
  
  BEPCII is designed at the beam energy of 1.89 GeV. According to the requirements of high energy physics, BEPCII has been operated in the energy region from 1.0 GeV to 2.3 GeV since 2009. The energy region is quite large so that it is very important to select optics for the optimized luminosity. Different optics within different energy region at BEPCII will be introduced in detail in this paper.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2018-TUOBB04  
About • paper received ※ 23 September 2018       paper accepted ※ 19 February 2019       issue date ※ 21 April 2019  
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TUPAB01 KEKB Injection Developments injection, linac, 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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TUPAB07 Commissioning of Positron Damping Ring and the Beam Transport for SuperKEKB emittance, linac, positron, MMI 152
 
  • N. Iida, Y. Funakoshi, H. Ikeda, T. Ishibashi, H. Kaji, T. Kamitani, M. Kikuchi, T. Kobayashi, H. Koiso, F. Miyahara, T. Mori, Y. Ohnishi, Y. Seimiya, H. Sugimoto, H. Sugimura, R. Ueki, Y. Yano, D. Zhou
    KEK, Ibaraki, Japan
  
  The Positron Damping Ring (DR) for SuperKEKB successfully started its operation in February 2018, and the commissioning was continued until the end of SuperKEKB Phase 2 in July without serious troubles. This paper describes achievements of the beam commissioning of injection and extraction lines (LTR and RTL) between the LINAC and DR. In the LTR commissioning, the positron beam with high emittance, wide energy spread, and high charge were transported and injected into the DR. In the RTL commissioning, special cares were necessary to preserve the low emittance. The observed emittance growth in the RTL was not a problem for Phase 2, but it should be resolved in the coming Phase 3. In this paper, brief results of the commissioning of the DR is also reported.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2018-TUPAB07  
About • paper received ※ 20 October 2018       paper accepted ※ 19 February 2019       issue date ※ 21 April 2019  
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WEYAA03 SRF System for KEKB and SuperKEKB cavity, controls, HOM, LLRF 256
 
  • K. Nakanishi, T. Kobayashi, M. Nishiwaki
    KEK, Ibaraki, Japan
  • K. Hirosawa
    Sokendai, Ibaraki, Japan
  
  Eight superconducting accelerating cavities were operated for more than ten years at the KEKB. Commisioning operation of SuperKEKB is ongoing and those cavities are also used to accelerate the electron beam of 2.6 A. There are some issues to address the large beam current and to realize stable operation. One issue is a large HOM power of 37 kW expected to be induced in each cavity module. To cope with the HOM power issue, we have installed an additional HOM damper to the downstream of the cavity module. Another issue is degradation of Q values of the cavities during the ten years operation. Cause of the degradation was particle contamination. To clean the cavity surface, high pressure rinsing (HPR) is an effective way. Therefore we have developed a horizontal HPR. In this method, a nozzle for water jet is inserted horizontally into the cavity module without disassembly of the cavity. We applied the horizontal HPR to our degraded cavities. The RF performances of those cavities have been successfully recovered. In this report, present status of our cavity will be presented. Additionally, LLRF control issues for SuperKEKB will be introduced.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2018-WEYAA03  
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, collider, factory 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, collider, 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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WEPAB04 KEKB/SuperKEKB Cryogenics Operation cavity, controls, superconducting-cavity, cryogenics 276
 
  • K. Nakanishi, K. Hara, T. Honma, K. Hosoyama, M.K. Kawai, Y. Kojima, Y. Morita, H. Nakai, N. Ohuchi, H. Shimizu
    KEK, Ibaraki, Japan
  • T. Endo, T. Kanekiyo
    Hitachi Plant Mechanics Co,.Ltd., Kudamatsu city, Japan
  
  KEKB/SuperKEKB cryogenics operation will be introduced. KEKB was built in the tunnel of the TRISTAN accelerator. The TRISTAN accelerator was operated from 1986 to 1995. The superconducting acceleration cavities were installed in 1988 to increase the beam energy. The cryogenic system for superconducting cavities was also established simultaneously. In 1989 superconducting cavities were added, and cryogenic systems were also enhanced from 4kW to 6.5kW. KEKB took over many facilities from TRISTAN. The cryogenic system for superconducting cavities is one of them. This old refrigerator is used also in SuperKEKB. In operation of the cryogenic system, it is necessary to cool down the equipment from room temperature. In KEKB, its cooling rate of cavities are limited to 2.5~3K/h. In the steady state, the pressure and the liquid level in the superconducting cavity cryomodule should be kept constant. To keep the condition in the cryomodule stably, the sum of the heat generated by RF and the heater is controlled as constant. In KEKB/SuperKEKB, superconducting magnets are also used. They have their own refrigerator. In the workshop, they are also introduced.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2018-WEPAB04  
About • paper received ※ 24 September 2018       paper accepted ※ 19 February 2019       issue date ※ 21 April 2019  
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WEPBB01 Operation of SuperKEKB in Phase 2 injection, 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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THXBA01 Summary on Accelerator Infrastructures and Commissioning luminosity, site, cryogenics, collider 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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