Basic research of beam instability with high current ERL beam by newly developed position monitor of superconducting cavities precisely

2013 Fiscal Year Final Research Report

• Project/Area Number: 23740221
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: High Energy Accelerator Research Organization
• Principal Investigator: SAKAI Hiroshi 大学共同利用機関法人高エネルギー加速器研究機構, 加速器研究施設, 准教授 (50345229)
• Project Period (FY): 2011 – 2013
• Keywords: 加速器 / ビーム物理 / 超伝導空洞 / CWライナック / 超精密測定 / エネルギー回収 / 極低温 / モニター

Research Abstract

Alignment of superconducting cavities is one of the important issues for next generation accelerator like energy recovery linac (ERL). To measure the cavity displacement under cooling to liquid He temperature more precisely, we newly developed the position monitor by using white light interferometer. This monitor is based on the measurement of the interference of light between the measurement target and the reference point. It can measure the position from the outside of the cryomodule. We applied this monitor to the main linac cryomodule at ERL test facility and successfully measured the displacement during 2K cooling with the resolution of +-5um. And by monitoring these displacements in detail, we achieved the energy recovery with 6uA CW beam.

Research Products

• [Journal Article] Precise Measurement of Superconducting Cavity Movement in Cryomodule by the Position Monitor Using White Light Interferometer (2013)
  • Author(s): H. Sakai, T. Aoto, K. Enami, T. Furuya, M. Sato, K. Shinoe, K. Umemori, E. Cenni, M. Sawamura, K. Hayashi, T. Kanzaki
  • Journal Title: Proc. of SRF2013, (Paris, France) Pages: 288-293
• [Journal Article] Field Emission Measure During cERL Main Linac Cryomodule High Power Test in KEK (2013)
  • Author(s): E. Cenni, T. Furuya, H. Sakai, K. Umemori, K. Enami, K. Shinoe, M. Sato, M. Sawamura
  • Journal Title: Proc. Of SRF2013, (Paris, France) Pages: 672-676
• [Journal Article] Construction of Main Linac Cryomodule for Compact ERL Project (2013)
  • Author(s): K. Umemori, K. Enami, T. Furuya, H. Sakai, M. Sato, K. Shinoe, M. Sawamura, E. Cenni
  • Journal Title: Proc. of IPAC2013, (Shanghai, China) Pages: 2349-2351
• [Journal Article] Status of Main Linac Cryomodule for Compact ERL Project (2012)
  • Author(s): K. Umemori, K. Enami, T. Furuya, H. Sakai, M. Sato, K. Shinoe, M. Sawamura, E. Cenni
  • Journal Title: Proc. of IPAC2012, (New Orleans, U.S.A) Pages: 67-69
• [Journal Article] High Power Tests of KEK-ERL Input Coupler for Main Linac under Liquid Nitrogen Condition (2011)
  • Author(s): H. Sakai, T. Furuya, N. Nakamura, K. Umemori, K. Shinoe, M. Sawamura, E. Cenni
  • Journal Title: Proc. of SRF2011, (Chicago, U.S.A) Pages: 356-360
• [Presentation] Compact ERL 周回部の現状 -高品質、大電荷ビームエネルギー回収実現に向けて- (2014)
  • Author(s): 阪井寛志, 他86人
  • Organizer: 第27回日本放射光学会年会
  • Place of Presentation: 広島
  • Year and Date: 2014-01-12
• [Presentation] High Power CW Tests of cERL Main-Linac Cryomodule (2013)
  • Author(s): H. Sakai, K. Enami, T. Furuya, M. Sato, K. Shinoe, K. Umemori, E. Cenni, M. Sawamura
  • Organizer: 第10回日本加速器学会年会, THIOC02, SRF2013
  • Place of Presentation: Paris, France
  • Year and Date: 2013-09-26
  • Invited
• [Presentation] Comapct ERL 主加速部超伝導空洞クライオモジュールのハイパワーテスト (2013)
  • Author(s): 阪井寛志、梅森健成、江並和宏、佐藤昌史、沢村勝、篠江憲治、古屋貴章、Cenni Enrico
  • Organizer: 第10回日本加速器学会年会, MOOT09
  • Place of Presentation: 名古屋, 愛知
  • Year and Date: 2013-08-05
• [Presentation] Overview of CW Input Coupler for ERL (2011)
  • Author(s): H. Sakai
  • Organizer: FRIOA05, SRF2011
  • Place of Presentation: Chicago, U.S.A
  • Year and Date: 2011-07-29
  • Invited
• [Presentation] Construction of Main Linac Cryomodule for Compact ERL Project (2011)
  • Author(s): K. Umemori, T. Furuya, E. Kako, S. Noguchi, H. Sakai, M. Sato, T. Shishido, K. Watanabe, Y. Yamamoto, K. Shinoe, M. Sawamura, E. Cenni
  • Organizer: FRIOA06, SRF2011
  • Place of Presentation: Chicago, U.S.A
  • Year and Date: 2011-07-29
  • Invited
• [Remarks]
  • URL: http://pfwww.kek.jp/ERLoffice/