Author: Adachi, T.
Paper Title Page
TUOBA01 Beam Commissioning of SuperKEKB 1019
 
  • Y. Funakoshi, T. Abe, T. Adachi, K. Akai, Y. Arimoto, K. Egawa, Y. Enomoto, J.W. Flanagan, H. Fukuma, K. Furukawa, N. Iida, H. Iinuma, H. Ikeda, T. Ishibashi, M. Iwasaki, T. Kageyama, H. Kaji, T. Kamitani, T. Kawamoto, S. Kazama, M. Kikuchi, T. Kobayashi, K. Kodama, H. Koiso, M. Masuzawa, T. Mimashi, T. Miura, F. Miyahara, T. Mori, A. Morita, S. Nakamura, T.T. Nakamura, H. Nakayama, T. Natsui, M. Nishiwaki, K. Ohmi, Y. Ohnishi, T. Oki, S. Sasaki, M. Satoh, Y. Seimiya, K. Shibata, M. Suetake, Y. Suetsugu, H. Sugimoto, M. Tanaka, M. Tawada, S. Terui, M. Tobiyama, S. Uehara, S. Uno, X. Wang, K. Watanabe, Y. Yano, S.I. Yoshimoto, R. Zhang, D. Zhou, X. Zhou, Z.G. Zong
    KEK, Ibaraki, Japan
  • D. El Khechen
    LAL, Orsay, France
  
  In this report, we describe the machine operation in the first 3 months of the Phase 1 commissioning of SuperKEKB. The beam commissioning is smoothly going on. Vacuum scrubbing, the optics corrections and others are described.  
slides icon Slides TUOBA01 [9.346 MB]  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUOBA01  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
TUPMR021 A Racetrack-shape Fixed Field Induction Accelerator for Giant Cluster Ions 1278
 
  • K. Takayama, T. Adachi, K. Okamura, M. Wake
    KEK, Ibaraki, Japan
  • T. Adachi, K. Okamura
    Sokendai, Ibaraki, Japan
  • Y. Iwata
    AIST, Tsukuba, Japan
  • Y. Yuri
    JAEA/TARRI, Gunma-ken, Japan
  
  At KEK, circular induction accelerators employing an induction acceleration system, which is characterized by a simple fact of functional separation of acceleration and beam confinement, have been developed since 2000. The slow cycling induction synchrotron (IS) was demonstrated using the KEK 12 GeV PS in 2006, where superbunch formation and focusing-free transition energy crossing were realized*. The fast cycling IS called the KEK digital accelerator is under operation since 2012**, where bunch squeezing and splitting/merging never realized in RF synchrotrons have been demonstrated, as well as acceleration in a wide range of ion mass to charge ratio. Based on the experiences, a racetrack-shape fixed field induction accelerator (induction microtron)*** that can accelerate giant cluster ions such as C-60 or Si-100, to high energy beyond that of electrostatic accelerators has been designed. Its full story and status of R&D work will be presented at the conference.
* K.Takayama, Induction Accelerators (Springer, 2010), Chapter 11,12
** K.Takayama et al., Phys. Rev. ST-AB 17, 010101(2014).
*** K.Takayama, T.Adachi, et al., Phys. Rev. ST-AB 18, 050101(2015).
 		 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMR021  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
THPMW001 SuperKEKB Main Ring Power Supply System 3531
 
  • S. Nakamura, T. Adachi, T. Oki, N. Tokuda
    KEK, Ibaraki, Japan
  
  The power supplies for magnets of KEKB main ring were recycled into SuperKEKB main ring. Several tests were performed for all of the power supplies to check the soundness. Some of the power supplies were improved to satisfy the requirements of optical design, and some of them were replaced by new power supplies. Most of the trim-coils were arranged with one of power supply per a coil in SuperKEKB. The total number of the power supplies is over 2000.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMW001  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
THPMW003 Prototype Power Supply for SuperKEKB Final Focus Superconducting Corrector Magnets 3537
 
  • T. Oki, T. Adachi, S. Nakamura, N. Ohuchi, N. Tokuda
    KEK, Ibaraki, Japan
  
  A prototype power supply for the SuperKEKB final focus superconducting corrector magnets was developed. The aiming specifications of the power supply are a DC rated output of ± 60 A ± 5 V bipolar, current setting resolution < 1 ppm, current stability < 5 ppm/8 h, temperature coefficient < 1 ppm/degree, and current ripple < 5 ppm, where the assumed magnet inductance and cable resistance are 0.2'8.7 mH and 75 mohms, respectively. High power tests were performed and expected results were obtained.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMW003  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
THPOR005 Tunnel Level Variation in the SuperKEKB Interaction Region 3774
 
  • M. Masuzawa, T. Adachi, T. Kawamoto
    KEK, Ibaraki, Japan
  
  SuperKEKB is an electron-positron collider, which aims to achieve a peak luminosity 40 times higher than that of KEKB. The vertical beam sizes of both rings are squeezed down to 50 - 60 nm at the interaction point (IP), which accounts for a factor of 20 in the luminosity increase, and the beam currents are doubled from those of KEKB. Tunnel motion can be critical for realizing the collisions of such small beams. A Hydrostatic Leveling System (HLS), which consists of 18 sensors, was installed on both sides of the IP to monitor tunnel level variations continuously. Effects of heavy rain and installation of the radiation shield blocks on the tunnel floor level are clearly seen. The HLS data during construction and SuperKEKB commissioning are reported.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOR005  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)