Author: Ueki, R.
Paper Title Page
TUPAB07 Commissioning of Positron Damping Ring and the Beam Transport for SuperKEKB 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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WEXBA04 Early Commissioning of the Luminosity Dither System for SuperKEKB 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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WEOBB04
 Operation of Superconducting Final Focus Magnet System of SuperKEKB  
 
  • N. Ohuchi, K.A. Aoki, Y. Arimoto, M.K. Kawai, Y. Kondo, K. Tsuchiya, R. Ueki, X. Wang, H. Yamaoka, Z.G. Zong
    KEK, Ibaraki, Japan
  
  SuperKEKB has been constructed with the target luminosity of 8×1035, which is 40 times higher than KEKB, by the "Nano-Beam" scheme. The beams of 7 GeV electrons and 4 GeV positrons collide at the interaction point (IP) with the crossing angle of 83 mrad, and both beams are squeezed to 50 nano-m in the vertical direction and 10 micro-m in the horizontal direction at IP by the superconducting magnet system. The system consists of 8 superconducting quadrupole magnets (quadrupole doublets), 4 superconducting solenoids and 43 superconducting corrector magnets. After the installation of the magnet system into the beam interaction region, SuperKEKB was operated as the Phase-2 beam commissioning from 2018 March to 2018 July. In the paper, we would like to describe the superconducting magnet system and the experiences on the magnet system during the beam operation.  
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