Study of electron longitudinal phase space in laser wakefield acceleration via electro-optic streaking technique

2022 Fiscal Year Annual Research Report

• Project/Area Number: 21K17998
• Research Institution: National Institutes for Quantum Science and Technology
• Principal Investigator: 黄 開 国立研究開発法人量子科学技術研究開発機構, 関西光科学研究所 光量子科学研究部, 主任研究員 (30866166)
• Project Period (FY): 2021-04-01 – 2023-03-31
• Keywords: high power laser / electron acceleration / beam diagnostics / longitudinal phase space / electro-optic sampling

Outline of Annual Research Achievements

We proposed a brand new electro-optic streaking technique for the single-shot measurement of the electron longitudinal phase space (LPS) in laser wakefield acceleration. Based on the preparations in the first fiscal year, the major research achievements in the last fiscal year are:
(1) For the experimental aspect: The experimental set-up of the LPS measurement in LWFA was carefully designed. A dog-leg system composed of two dipole magnet was designed. The magnets have been manufactured and delivered. For easier access to the overall self-field information of the electron bunches, the measurement on the transition radiations (TR) from the electron bunches are planned.
(2) For the theoretical aspect: I have developed a code covering all the sessions in the LPS measurement: time lag calculation in the dog-leg, TR imaging calculation, electro-optic (EO) signal calculation, etc. In the calculation, I have observed distinguishable differences of the EO signals when the electron bunches have different temporal energy chirps.
Major publication highlights: The paper "Kai Huang et al., Applied Physics Express 15, 036001 (2022)" was specially selected as the highlight of the journal from all the spotlight papers in 2022. Two invited review papers were published: “K. Huang, J. Plasma Fusion Res. Vol.99, No.2 (2023) 33-39” and “J. Particle Accelerator Society of Japan, Vol. 19, No. 3, 2022”. Several talks have been given in international conferences.

Research Products

• [Journal Article] 電気光学サンプリング技術によるレーザー航跡場加速電子の時間特性評価 (2023)
  • Author(s): 黄 開
  • Journal Title: プラズマ・核融合学会誌 Volume: 99 Pages: 33~39
  • Peer Reviewed / Open Access
• [Journal Article] Precise pointing control of high-energy electron beam from laser wakefield acceleration using an aperture (2023)
  • Author(s): Nakanii Nobuhiko、Huang Kai、Kondo Kotaro、Kiriyama Hiromitsu、Kando Masaki
  • Journal Title: Applied Physics Express Volume: 16 Pages: 026001～026001
  • DOI: 10.35848/1882-0786/acb892
  • Peer Reviewed / Open Access
• [Journal Article] レーザー航跡場加速における電気光学サンプリングによる非破壊単発電子タイミング診断 (2022)
  • Author(s): 黄 開、神門 正城
  • Journal Title: 加速器 Volume: 19 Pages: 124～130
  • DOI: 10.50868/pasj.19.3_124
  • Peer Reviewed / Open Access
• [Presentation] Real-time temporal monitoring of laser Wakefield electron bunches via electro-optic spatial decoding (2023)
  • Author(s): 黄 開
  • Organizer: 2022年度ビーム物理研究会、若手の会
• [Presentation] Temporal characterizations of electron bunches from laser plasma accelerator (2022)
  • Author(s): KAI HUANG, Kotaki Hideyuki, Mori Michiaki, Esirkepov Timur, James Kevin Koga, Hayashi Yukio, Nakanii Nobuhiko, Kando Masaki, Zhan Jin, Hosokai Tomonao
  • Organizer: 6th Asia-Pacific Conference on Plasma Physics, 2022
  • Int'l Joint Research / Invited