Keyword: luminosity
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MOXAA02 Highlights from SuperKEKB Commissioning MMI, optics, coupling, detector 1
 
  • Y. Ohnishi
    KEK, Ibaraki, Japan
  
  SuperKEKB is an electron-positron double-ring asymmetric-energy collider to search new physics phenomena appeared in B-boson decays. In order to accomplish this purpose, the huge statics, it is necessary for 40 times the luminosity as high as the predecessor KEKB collider. The strategy is that the vertical beta function at the IP is squeezed down to 1/20 and the beam currents doubles those of KEKB while keeping the same beam-beam parameter. The vertical beta function at the IP will be much smaller than the bunch length, however, the hourglass effect which degrades the luminosity will be reduced by adopting a novel ‘‘nano-beam’ scheme. First of all, the Phase 2 commissioning was focused on the verification of nano-beam scheme. Secondary, beam related background at the Belle II detector was also studied for the preparation of the pixel vertex detector installed before the Phase 3 operation. The preliminary results and accomplishments of the commissioning in Phase 2 will be reported in this article.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2018-MOXAA02  
About • paper received ※ 12 October 2018       paper accepted ※ 19 February 2019       issue date ※ 21 April 2019  
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MOXBA01 Challenges for Circular e+e− Colliders collider, electron, operation, 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 detector, experiment, operation, 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, operation 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 collider, 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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TUOAB04 Optics Corrections including IP Local Coupling at SuperKEKB coupling, MMI, optics, operation 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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TUOBB01 Optics Aberration at IP and Beam-beam Effects coupling, emittance, MMI, optics 66
 
  • K. Ohmi, Y. Funakoshi, H. Koiso, A. Morita, Y. Ohnishi, D. Zhou
    KEK, Ibaraki, Japan
  • K. Hirosawa
    Sokendai, Ibaraki, Japan
  
  Collision in SuperKEKB phase II commissioning has started in April 2018. Luminosity was lower than the geomterical value even in very low bunch current. Linear x-y coupling at IP caused by skew of QCS was conjectured as error source. x-y coupling correction using skew corrector of QCS resulted in luminosity recover of 2 times. After the QCS skew correction, luminosity is still limited at relatively low bunch current. Nonlinear x-y coupling at IP is conjectured as a source of the luminosity limitation. We discuss effects of linear and nonlinear x-y coupling at IP on the beam-beam performance.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2018-TUOBB01  
About • paper received ※ 25 September 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 collider, factory, positron, electron 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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TUOBB04 Different Optics within Large Energy Region at BEPCII emittance, lattice, operation, 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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TUYBA01 Benchmarking of Simulations of Coherent Beam-beam Instability simulation, MMI, experiment, synchrotron 103
 
  • K. Ohmi, H. Koiso, Y. Ohnishi
    KEK, Ibaraki, Japan
  • D. El Khechen
    CERN, Geneva, Switzerland
  • K. Hirosawa
    Sokendai, Ibaraki, Japan
  
  Coherent beam-beam nstability in head-tail mode has been predicted in collision with a large crossing angle. The instability is serious for design of future e+e− colliders based on the large crossing angle collision. It is possible to observe the instability in SuperKEKB commissioning. Horizontal beam size blow-up of both beams has been seen depending on the tune operating point. We report the measurement results of the instability in SuperKEKB phaseII commissioning.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2018-TUYBA01  
About • paper received ※ 25 September 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 resonance, betatron, ECR, collider 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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TUYBA04 Some Issues on Beam-beam Interaction at CEPC impedance, dynamic-aperture, simulation, factory 116
 
  • C.H. Yu, D. Wang, N. Wang, Y. Wang, J. Wu, Y. Zhang
    IHEP, Beijing, People’s Republic of China
  
  Funding: Project 11775238 supported by NSFC
In this paper, the beam-beam study in CEPC CDR is briefly introduced. Some issues related with beam-beam interaction will be emphasized. The bunch lengthening due to impedance and beamstrahlung is simulated in a more self-consistent method. It is found that there exist very narrow stable working point space at W-mode during the CDR design study. We’ll show wider tune scan result. It is found that there exist some disagreement between dynamic aperture and beam lifetime. We try to define the so-called diffusion rate map to explain the cause. Some initial result for different lattice solution is shown. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2018-TUYBA04  
About • paper received ※ 26 September 2018       paper accepted ※ 19 February 2019       issue date ※ 21 April 2019  
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TUPAB01 KEKB Injection Developments injection, linac, operation, controls 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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TUPBB06 Fast Luminosity Monitoring for the SuperKEKB Collider (LumiBelle2 Project) MMI, detector, feedback, monitoring 173
 
  • P. Bambade, S. Di Carlo, D. Jehanno, V. Kubytskyi, C.G. Pang, Y. Peinaud
    LAL, Orsay, France
  • Y. Funakoshi, S. Uehara
    KEK, Ibaraki, Japan
  
  Funding: - MSCA RISE E-JADE project, funded by European Commission grant number 645479 - Toshiko Yuasa France-Japan Particle Physics Laboratory (project A-RD-08)
LumiBelle2 is a fast luminosity monitoring system prepared for SuperKEKB*. It uses sCVD diamond detectors placed in both the electron and positron rings to measure the Bhabha scattering process at vanishing scattering angle. Two types of online luminosity signals are provided, a Train-Integrated-Luminosity at 1 kHz as input to the dithering feedback system used to maintain optimum overlap between the colliding beams in horizontal plane, and Bunch-Integrated-Luminosities at about 1 Hz to check for variations along the bunch trains. Individual beam sizes and offsets can also be determined from collision scanning. The design of LumiBelle2 will be described and its performance during the Phase-2 commissioning of SuperKEKB will be reported.
*First Tests of SuperKEKB Fast Luminosity Monitors During 2018 Phase-2 Commissioning" (WEPAL038) and "Early Phase 2 Results of LumiBelle2 for the SuperKEKB Electron Ring"(THYGBE4) presented at IPAC18 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2018-TUPBB06  
About • paper received ※ 24 September 2018       paper accepted ※ 19 February 2019       issue date ※ 21 April 2019  
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WEXBA01 IR Design for High Luminosity and Low Backgrounds background, photon, detector, focusing 194
 
  • M.K. Sullivan
    SLAC, Menlo Park, California, USA
  
  Funding: Work supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-76SF00515 and HEP
New e+e− accelerator designs aim for factory-like performance with high-current beams and high luminosities. These new machines will push interaction region designs to new levels and require a careful evaluation of all previous background sources as well as introduce possibly new background sources. I present here a summary of standard background sources and also suggest a new possible background source for Synchrotron Radiation (SR) namely, specular reflection. In addition, one will have to pay closer attention to the beam tail particle distribution as this may become a significant source of SR background from the high-current and high-energy beams of these new designs. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2018-WEXBA01  
About • paper received ※ 16 October 2018       paper accepted ※ 19 February 2019       issue date ※ 21 April 2019  
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WEXBA02 Machine Detector Interface for the e+e− Future Circular Collider detector, background, simulation, photon 201
 
  • M. Boscolo, O.R. Blanco-García
    INFN/LNF, Frascati, Italy
  • N. Bacchetta
    INFN- Sez. di Padova, Padova, Italy
  • E. Belli
    INFN-Roma, Roma, Italy
  • M. Benedikt, H. Burkhardt, D. El Khechen, K. Elsener, M. Gil Costa, P. Janot, R. Kersevan, A.M. Kolano, E. Leogrande, M. Lueckof, E. Perez, N.A. Tehrani, H.H.J. Ten Kate, O. Viazlo, G.G. Voutsinas, F. Zimmermann
    CERN, Meyrin, Switzerland
  • A.P. Blondel, M. Koratzinos
    DPNC, Genève, Switzerland
  • A.V. Bogomyagkov, E.B. Levichev, S.V. Sinyatkin
    BINP SB RAS, Novosibirsk, Russia
  • F. Collamati
    INFN-Roma1, Rome, Italy
  • M. Dam
    NBI, København, Denmark
  • A. Novokhatski, M.K. Sullivan
    SLAC, Menlo Park, California, USA
  • K. Oide
    KEK, Ibaraki, Japan
  
  The international Future Circular Collider (FCC) study~[fccweb] aims at a design of p-p, \rm e+e-, e-p colliders to be built in a new 100~km tunnel in the Geneva region. The \rm e+e- collider (FCC-ee) has a centre of mass energy range between 90 (Z-pole) and 375~GeV (t\bar{t}). To reach such unprecedented energies and luminosities, the design of the interaction region is crucial. The crab-waist collision scheme~[ref:cw] has been chosen for the design and it will be compatible with all beam energies. In this paper we will describe the machine detector interface layout including the solenoid compensation scheme. We will describe how this layout fulfills all the requirements set by the parameters table and by the physical constraints. We will summarize the studies of the impact of the synchrotron radiation, the analysis of trapped modes and of the backgrounds induced by single beam and luminosity effects giving an estimate of the losses in the interaction region and in the detector.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2018-WEXBA02  
About • paper received ※ 03 November 2018       paper accepted ※ 19 February 2019       issue date ※ 21 April 2019  
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WEXBA04 Early Commissioning of the Luminosity Dither System for SuperKEKB feedback, controls, MMI, electron 212
 
  • Y. Funakoshi, T. Kawamoto, M. Masuzawa, S. Nakamura, T. Oki, M. Tobiyama, S. Uehara, R. Ueki
    KEK, Ibaraki, Japan
  • P. Bambade, S. Di Carlo, D. Jehanno, C.G. Pang
    LAL, Orsay, France
  • D.G. Brown, A.S. Fisher, M.K. Sullivan
    SLAC, Menlo Park, California, USA
  • D. El Khechen
    CERN, Geneva, Switzerland
  • U. Wienands
    ANL, Argonne, Illinois, USA
  
  SuperKEKB is an electron-positron double ring collider at KEK which aims at a peak luminosity of 8 x 1035 cm-2s-1 by using what is known as the ’nano-beam’ scheme. A luminosity dither system is employed for collision orbit feedback in the horizontal plane. This paper reports a system layout of the dither system and algorithm tests during the SuperKEKB Phase 2 commissioning.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2018-WEXBA04  
About • paper received ※ 15 October 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, injection, 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 operation, 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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THXBA01 Summary on Accelerator Infrastructures and Commissioning operation, 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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