Research of RF discharge mechanism due to crystal characteristicsassociated with high-gradient acceleration

2012 Fiscal Year Final Research Report

• Project/Area Number: 22604013
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Quantum beam science
• Research Institution: High Energy Accelerator Research Organization
• Principal Investigator: HIGO Toshiyasu 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, 教授 (10156581)
• Co-Investigator(Kenkyū-buntansha): MATSUMOTO Shuji 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 (70249902) ; HIGASHI Yasuo 大学共同利用機関法人高エネルギー加速器研究機構, 加速器科学支援センター, シニアフェロー (70208742) ; CHAN Xiaowei 大学共同利用機関法人高エネルギー加速器研究機構, 物質構造研究所, 研究機関講師 (80217257) ; YOKOYAMA Kazue 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, 助教 (70391711) ; ABE Tetsuo 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 (70370070)
• Project Period (FY): 2010 – 2012
• Keywords: 高電界 / 結晶構造 / 真空放電 / 加速器 / 無酸素銅 / リニアコライダー

Research Abstract

The vacuum arc happens on the surface under the high field sitting in the cavity where the electromagnetic field is confined. We assume that the crystal characteristics of the constituent material is the origin of the arcing, which happens once in several million pulses. A high-purity large-grain material is mechanically machined and heat treated in order to study the crystal nature of the material with high-resolution scanning electron microscope and synchrotron radiation. We found the different surface depending on the crystal orientation, the groove structure along the grain boundary and surface strain due to the impulse deposit of heat over the surface.

Research Products

• [Journal Article] A CLIC Prototype Higgs Factory (2012)
  • Author(s): R. Belusevic and T. Higo
  • Journal Title: KEK Pre-Print
• [Journal Article] High Gradient Test at Nextef and High-Power Long-Term Operation of Devices (2011)
  • Author(s): S. Matsumoto, T. Abe, Y. Higashi, T. Higo,Y. Du
  • Journal Title: Nucl. Instr. and Method in Physics Research Volume: A657 Pages: 160-167
  • Peer Reviewed
• [Journal Article] Progress on Scanning Field Emission Microscope Development for Surface Observation (2011)
  • Author(s): Y. Higashi, T. Higo, S. Matsumoto, K. Yokoyama, Zhang Xiaowei
  • Journal Title: Valery Dolgashev, Sami Tantawi and B. SpataroNucl. Instr. and Method in Physics Research Volume: A657 Pages: 156-159
  • Peer Reviewed
• [Journal Article] 狭導波管を用いた銅及びステンレス材での高電界 RF 放電特性の比較 (2010)
  • Author(s): 横山和枝、松本修二、肥後寿泰、福田茂樹
  • Journal Title: 日本電気学会 学会誌 2010 年 Volume: Vol. 130, No. 12 Pages: IEEJ ID A10-039
  • Peer Reviewed
• [Presentation] Comparison of High Gradient Performance in Varying Cavity Geometries (2013)
  • Author(s): T. Higo, T. Abe, Y. Arakida, S. Matsumoto, T. Shidara, T. Takatomi, M. Yamanaka, Y. Higashi, A. Grudiev, G. Riddone, W. Wuensch
  • Organizer: WEPFI018,IPAC2013
  • Place of Presentation: Shanghai, China
  • Year and Date: 2013-05-22
• [Presentation] 高電界パルス運転での真空放電現象の特性THPS093 (2012)
  • Author(s): 肥後寿泰、阿部哲郎、荒木田是男、東保男、松本修二、設楽哲夫、高富俊和
  • Organizer: 日本加速器学会
  • Place of Presentation: 大阪
  • Year and Date: 20120808-11
• [Presentation] 高電界 X バンド単セル空洞の4分割方式による製作 (2012)
  • Author(s): 阿部哲郎、東保男、荒木田是男、肥後寿泰、松本修二、設楽哲夫、高富俊和
  • Organizer: THPS095、日本加速器学会
  • Place of Presentation: 大阪
  • Year and Date: 20120808-11
• [Presentation] Breakdown Characteristics in DC Spark Experiments of Copper Focusing on Purity and Hardness (2011)
  • Author(s): K. Yokoyama, T. Higo, S. Fukuda, Y. Higashi, S. Matsumoto, C. Pasquino, S. Calatroni
  • Organizer: WEPS068、日本加速器学会
  • Place of Presentation: 姫路
  • Year and Date: 20110800
• [Presentation] Fast X-ray reflectivity measurement using a cooling PIN photodiode (2010)
  • Author(s): X. Zhang, H. Fujimoto and A. Waseda2011 IOP Conf. Ser.: Mater. Sci. Eng. 24 012025 doi:10.1088/1757-899X/24/1/012025
  • Organizer: Buried Interface Sciences with X-rays and Neutrons 2010
  • Place of Presentation: Nagoya
  • Year and Date: 20100725-27
• [Presentation] Advances in X-Band TW Accelerator Structures Operating in the 100 MV/mRegime (2010)
  • Author(s): T. Higo, Y. Higashi, S. Matsumoto, K. Yokoyama, S. Doebert, A. Grudiev, G. Riddone, W. Wuensch, R. Zennaro
  • Organizer: THPEA013, IPAC2010
  • Place of Presentation: Kyoto
  • Year and Date: 20100500
• [Presentation] Various Observables of TW Accelerator Structures Operating in 100MV/m or Higher at X-Band Facility, Nextef of KEK (2010)
  • Author(s): T. Higo, S. Matsumoto, K. Yokoyama, S. Fukuda, M. Akemoto, M. Yoshida, T. Shidara, T. Abe, Y. Higashi, T. Takatomi, Y. Watanabe, K. Ueno, N. Higashi, N. Kudoh
  • Organizer: THPEA012, IPAC2010
  • Place of Presentation: Kyoto
  • Year and Date: 20100500
• [Remarks]
  • URL: http://www-linac.kek.jp/nextef/