Keyword: detector
Paper Title Other Keywords Page
MOXAA02 Highlights from SuperKEKB Commissioning luminosity, MMI, optics, coupling 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  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
MOYAA02 Status of DAΦNE: from KLOE-2 to SIDDHARTA-2 Experiment with Crab-Waist luminosity, 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  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
TUPBB05 Beam Instrumentation at SuperKEKB timing, injection, MMI, feedback 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  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
TUPBB06 Fast Luminosity Monitoring for the SuperKEKB Collider (LumiBelle2 Project) luminosity, MMI, 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  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
WEXAA01 High Precision Experiments in the J/psi, Psi(2S) and Tau Sector polarization, resonance, scattering, storage-ring 179
 
  • I.B. Nikolaev
    BINP SB RAS, Novosibirsk, Russia
  
  High precision experiments in charmonium sector require beam energy calibration. VEPP-4M storage ring with energy measurement by resonant depolarization (RD) method provided high precision mass measurement of J/ψ- and ψ(2S)- mesons with KEDR detector with accuracy 2×10-6. This narrow resonances can be used for calibration of energy scale of other accelerators such as BEPC-II or future Super Charm-Tau Factories equipped with Compton backscattering (CBS) energy measurement system.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2018-WEXAA01  
About • paper received ※ 12 October 2018       paper accepted ※ 19 February 2019       issue date ※ 21 April 2019  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
WEXBA01 IR Design for High Luminosity and Low Backgrounds background, photon, luminosity, 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  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
WEXBA02 Machine Detector Interface for the e+e− Future Circular Collider background, simulation, luminosity, 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  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
WEXBA05 Machine Detector Interface for CEPC photon, solenoid, scattering, background 217
 
  • S. Bai, J. Gao, H. Geng, D. Wang, Y. Wang, C.H. Yu, Y. Zhang, Y.S. Zhu
    IHEP, Beijing, People’s Republic of China
  
  The Circular Electron Positron Collider (CEPC) is a proposed Higgs factory with center of mass energy of 240 GeV to measure the properties of Higgs boson and test the standard model accurately. Machine Detector Interface (MDI) is the key research area in electron-positron colliders, especially in CEPC, it is one of the criteria to measure the accelerator and detector design performance. In this paper, we will introduce the CEPC superconducting magnets design, solenoid compensation, synchrotron radiation and mask design, detector background, collimator, mechanics assembly etc on, which are the most critical physics problem.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2018-WEXBA05  
About • paper received ※ 29 September 2018       paper accepted ※ 19 February 2019       issue date ※ 21 April 2019  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
WEXBA06 Beam Background at SuperKEKB During Phase 2 Operation background, luminosity, 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  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
WEOAB01 Commissioning Status of SuperKEKB Vacuum System vacuum, MMI, photon, wiggler 226
 
  • K. Shibata, H. Hisamatsu, T. Ishibashi, K. Kanazawa, M. Shirai, Y. Suetsugu, S. Terui
    KEK, Ibaraki, Japan
  
  In the upgrade from the KEKB to the SuperKEKB, approximately 93% and 20% of the beam pipes and vacuum components of the positron ring and the electron ring were replaced with new ones. In the Phase-1 commissioning in 2016, vacuum scrubbing and confirmation of the stabilities of new vacuum components at approximately 1 A were carried out. Though some problems such as pressure bursts accompanying beam losses were revealed, no serious problem was found in the vacuum system. During the subsequent shutdown, the countermeasures against the problems were taken, and new beam pipes and components such as beam collimators were installed. The Phase-2 commissioning, where beam collision tuning was mainly performed, was carried out from March to July 2018. The collimators worked very well to suppress the background noise of the Belle-II detector, though some of them were damaged by the beam. The frequency of the pressure burst drastically decreased though the typical beam currents were lower than those of the Phase-1. The vacuum system of the SuperKEKB has been working generally well so far. The total beam doses of the SuperKEKB exceeded 1000 Ah, and the pressures decreased as expected.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2018-WEOAB01  
About • paper received ※ 02 October 2018       paper accepted ※ 19 February 2019       issue date ※ 21 April 2019  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
WEOBB02 CEPC Superconducting Magnets solenoid, quadrupole, interaction-region, sextupole 241
 
  • Y.S. Zhu, F.S. Chen, W. Kang, M. Yang, X.C. Yang
    IHEP, Beijing, People’s Republic of China
  
  Funding: This work was supported in part by the Yifang Wang scientific Studio of the Ten Thousand Talents Project and in part by the National Natural Science Foundation of China under Grant 11875272.
A Circular Electron Positron Collider (CEPC) with a circumference about 100 km, a beam energy up to 120 GeV is proposed to be constructed in China. CEPC will be a double ring collider with two interaction points. Most magnets for CEPC accelerator are conventional magnets, but some superconducting magnets are needed in the interaction region. Final focus superconducting high gradient quadrupoles are inside the solenoid field of Detector magnet, so superconducting anti-solenoid is need to minimize the effect of the solenoid field on the beam. In addition, high strength superconducting sextupole magnets are also required. In this paper, the layout and conceptual design of CEPC Interaction Region superconducting magnets are described, and the R&D plan is presented. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2018-WEOBB02  
About • paper received ※ 23 September 2018       paper accepted ※ 19 February 2019       issue date ※ 21 April 2019  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)