Author: Akai, K.
Paper Title Page
MOPHA056 Status of LLRF Control System for SuperKEKB Commissioning 924
 
  • T. Kobayashi, K. Akai, K. Ebihara, A. Kabe, K. Nakanishi, M. Nishiwaki, J.-I. Odagiri
    KEK, Ibaraki, Japan
  • H. Deguchi, K. Hayashi, T. Iwaki, M. Ryoshi
    Mitsubishi Electric TOKKI Systems, Amagasaki, Hyogo, Japan
  
  Beam commissioning of the SuperKEKB will be started in JFY2015. A new LLRF control system, which is an FPGA-based digital RF feedback control system on the MicroTCA platform, has been developed for high current beam operation of the SuperKEKB. The mass production and installation of the new systems has been completed as scheduled. The new LLRF control systems are applied to nine RF stations (klystron driving units) among existing thirty stations. As a new function, klystron phase lock loop was digitally implemented within the cavity FB control loop in the FPGA, and in the high power test it worked successfully to compensate for the klystron phase change. Beam loading was also simulated in the high power test by using an ARES cavity simulator, and then good performance in the cavity-voltage feedback control and the cavity tuning control was demonstrated to compensate the large beam loading for the SuperKEKB parameters. Fabrication of another new LLRF control system for damping ring which is required for low-emittance positron injection is scheduled in JFY2015.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPHA056  
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TUYB1 Progress of SuperKEKB 1291
 
  • T. Miura, T. Abe, T. Adachi, K. Akai, M. Akemoto, A. Akiyama, D.A. Arakawa, Y. Arakida, Y. Arimoto, M. Arinaga, K. Ebihara, K. Egawa, A. Enomoto, J.W. Flanagan, S. Fukuda, H. Fukuma, Y. Funakoshi, K. Furukawa, T. Furuya, K. Hara, T. Higo, H. Hisamatsu, H. Honma, T. Honma, R. Ichimiya, N. Iida, H. Iinuma, H. Ikeda, M. Ikeda, T. Ishibashi, H. Ishii, M. Iwasaki, A. Kabe, T. Kageyama, H. Kaji, K. Kakihara, S. Kamada, T. Kamitani, S. Kanaeda, K. Kanazawa, H. Katagiri, S. Kato, S. Kazama, M. Kikuchi, T. Kobayashi, H. Koiso, Y. Kojima, M. Kurashina, K. Marutsuka, M. Masuzawa, S. Matsumoto, T. Matsumoto, H. Matsushita, S. Michizono, K. Mikawa, T. Mimashi, F. Miyahara, K. Mori, T. Mori, A. Morita, Y. Morita, H. Nakai, H. Nakajima, T.T. Nakamura, K. Nakanishi, K. Nakao, H. Nakayama, T. Natsui, M. Nishiwaki, J.-I. Odagiri, Y. Ogawa, K. Ohmi, Y. Ohnishi, S. Ohsawa, Y. Ohsawa, N. Ohuchi, K. Oide, T. Oki, M. Ono, H. Sakai, Y. Sakamoto, S. Sasaki, M. Sato, M. Satoh, K. Shibata, T. Shidara, M. Shirai, A. Shirakawa, M. Suetake, Y. Suetsugu, R. Sugahara, H. Sugimoto, T. Suwada, S. Takasaki, T. Takatomi, T. Takenaka, Y. Takeuchi, M. Tanaka, M. Tawada, S. Terui, M. Tobiyama, N. Tokuda, K. Tsuchiya, X. Wang, K. Watanabe, H. Yamaoka, Y. Yano, K. Yokoyama, Ma. Yoshida, M. Yoshida, S.I. Yoshimoto, K. Yoshino, R. Zhang, D. Zhou, X. Zhou, Z.G. Zong
    KEK, Ibaraki, Japan
  • D. Satoh
    TIT, Tokyo, Japan
  
  This presentation will cover the status of the installation and the injector commissioning status of SuperKEKB. The IR optics and design with very low β* of less than 1 mm will be discussed.  
slides icon Slides TUYB1 [6.588 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-TUYB1  
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WEPMA051 Superconducting Solenoid Package Prototyping for FRIB SRF Linac 2886
 
  • K. Hosoyama, K. Akai, S. Yamaguchi
    KEK, Ibaraki, Japan
  • E.E. Burkhardt, K. Saito, Y. Yamazaki
    FRIB, East Lansing, Michigan, USA
  
  Funding: This material is based upon work supported by the U.S. Department of Energy Office of Science under Coopertive Agreement DESC000661.
FRIB is an under constructing machine in USA for nuclear physics, which has intensity front SRF linacs to accelerate ion beam from proton to uranium up to 200 MeV/u. FRIB has large users community, so the machine has to be operated very reliably and stably. Superconducting solenoid and steering dipoles as a package is mounted in the cryomodule nearby SRF cavities to focus beam strongly and space effectively. This produces an issue interacting between the fringe field from the solenoid and the SRF cavity, which makes potential performance degradation on SRF cavity. NbTi superconducting wire is utilized for the solenoid package. The high field design like 9T is very critical operation due to the SC characteristics of the wire. The solenoid package has to be designed very carefully. In this paper will report the prototyping of 25 cm 8T solenoid package for FRIB cryomodule, which includes design, fabrication, and cold test.
* This work has been done under the collaboration between KEK and MSU. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPMA051  
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