Development of an optically trapped multiple-pass Thomson scattering measurement system

2012 Fiscal Year Final Research Report

• Project/Area Number: 24656556
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Nuclear fusion studies
• Research Institution: The University of Tokyo
• Principal Investigator: EJIRI Akira 東京大学, 大学院・新領域創成科学研究科, 准教授 (30249966)
• Co-Investigator(Renkei-kenkyūsha): TAKASE Yuichi 東京大学, 大学院・新領域創成科学研究科, 教授 (70292828)
• Project Period (FY): 2012
• Keywords: プラズマ計測 / トムソン散乱 / 高周波立ち上げプラズマ / 球状トカマク

Research Abstract

In order to apply the Thomson scattering method to very low density plasmas, we have developed an optically trapped multiple-pass Thomson scattering system. Using a high voltage fast MOSFET, a driver for a Pockels cell was assembled, and90-degree rotation of the polarization within 20 ns was achieved. Using an optical arrangement equivalent to the plasma measurement, we detected 9 round trips of a laser pulse. The obtained total power amplification due to the round trips is more than 6. Notethat we inserted a beam sampler for this measurement.

Research Products

• [Journal Article] Electron Temperature Measurement on QUEST Spherical Tokamak by Thomson Scattering System (2013)
  • Author(s): T. YAMAGUCHI, A. EJIRI, J. HIRATSUKA, M. HASEGAWA, Y. NAGASHIMA, K. NARIHARA, Y. TAKASE, H. ZUSHI and the QUEST group
  • Journal Title: Plasma Fusion Res Volume: 8 Pages: 1302001
  • DOI: DOI:10.1585/pfr.8.1302001
  • Peer Reviewed
• [Journal Article] Off-Axis Temperature Anisotropy Measurement by Double-Pass Thomson Scattering Diagnostic System on TST-2 (2012)
  • Author(s): J. HIRATSUKA, A. EJIRI, M. HASEGAWA, Y. NAGASHIMA, Y. TAKASE, H. TOJO, T. YAMAGUCHI, T. AMBO, H. FURUI,T. HASHIMOTO, H. KAKUDA, K. KATO, T. OOSAKO, T. SAKAMOTO, R. SHINO, T. SHINYA, M. SONEHARA, T. WAKATSUKI and O. WATANABE
  • Journal Title: Plasma Fusion Res Volume: 7 Pages: 2402092
  • DOI: DOI:10.1585/pfr.7.2402092
  • Peer Reviewed
• [Presentation] Study of Electron Distribution Function Asymmetry by Thomson Scattering on TST-2 (2013)
  • Author(s): J. Hiratsuka
  • Organizer: The First A3 Foresight Workshop on Spherical Torus
  • Place of Presentation: Seoul, Korea
  • Year and Date: 20130114-16
• [Presentation] 最近のTST-2実験 (2013)
  • Author(s): 江尻晶
  • Organizer: ST研究会「マイクロ波駆動核融合」討論会
  • Place of Presentation: 岐阜県土岐市核融合科学研究所
  • Year and Date: 2013-03-06
• [Presentation] Double-pass Thomson scattering system on TST-2 spherical tokamak (2012)
  • Author(s): J. Hiratsuka
  • Organizer: The 9th Australia-Japan workshop on plasma diagnostics
  • Place of Presentation: JAEA, Naka,Japan
  • Year and Date: 20121203-06
• [Presentation] Development of An Advanced Thomson Scattering System on TST-2 Spherical Tokamak (2012)
  • Author(s): J. Hiratsuka
  • Organizer: GCOE International Symposium on Physical Sciences Frontier
  • Place of Presentation: The University of Tokyo, Hongo, Tokyo, Japan
  • Year and Date: 20121108-09
• [Presentation] Development of An Advanced Thomson Scattering System onTST-2 Spherical Tokamak (2012)
  • Author(s): J. Hiratsuka
  • Organizer: Japan-Korea Seminar 2012 for Plasma Diagnostics
  • Place of Presentation: Jeju, Korea
  • Year and Date: 20120823-25
• [Presentation] マルチパストムソン散乱計測における光学系と実現可能性の検討及び基礎実験 (2012)
  • Author(s): 冨樫央
  • Organizer: プラズマ若手夏の学校
  • Place of Presentation: 山形県蔵王温泉たかみや瑠璃倶楽リゾート
  • Year and Date: 20120820-23
• [Remarks]
  • URL: http://fusion.k.u-tokyo.ac.jp/research.html