Study for generation of eletron-positron plasma by using ultra-high intensity laser

2014 Fiscal Year Final Research Report

• Project/Area Number: 24244095
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Plasma science
• Research Institution: Osaka University
• Principal Investigator: NAKAI MITSUO 大阪大学, レーザーエネルギー学研究センタ, 教授 (70201663)
• Co-Investigator(Kenkyū-buntansha): NISHIMURA Hiroaki 大阪大学, レーザーエネルギー学研究センター, 教授 (60135754) ; TAKABE Hideaki 大阪大学, レーザーエネルギー学研究センター, 教授 (20150352) ; NAGATOMO Hideo 大阪大学, レーザーエネルギー学研究センター, 准教授 (10283813) ; KONDO Kininori 日本原子力研究開発機構, 研究主席 (80225614)
• Co-Investigator(Renkei-kenkyūsha): CHEN Hui Lawrence Livermore National Laboratory, Physisist
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: プラズマ物理 / 対生成 / 超相対論的プラズマ / 超高強度レーザー

Outline of Final Research Achievements

It was demonstrated by using the LFEX laser system at the Institute of Laser Engineering, Osaka University for the first time to generate abundant electron-positron pairs through the Bethe-Heitler process. It was shown that the control of the pulse contrast and pre-forming plasma is important and essential to maximized the efficiency of pair creation.
Following elements for the future study to create and investigate the electron-positron plasmas were developed in this project. 1) Plasma mirror system for the LFEX laser to decrease the pre-pulse level and separate focusing of the four beams from the LFEX. 2) New diagnostics were developed and installed on the LFEX such as high energy x-ray spectrometers with new design concepts and an imaging system for the scattered light. 3) A new remedy to avoid the run-away solution of radiation friction was introduced and relativistic PIC codes have been developed to investigate the pair-creation by ultra-high intense lasers.

Free Research Field

数物系科学