Realization of hydrogen-like nitrogen recombination soft x-ray laser pumped by fast cappilary discharge

2015 Fiscal Year Final Research Report

• Project/Area Number: 26630108
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Power engineering/Power conversion/Electric machinery
• Research Institution: Tokyo Institute of Technology
• Principal Investigator: Hotta Eiki 東京工業大学, 総合理工学研究科(研究院), 教授 (70114890)
• Co-Investigator(Kenkyū-buntansha): WATANABE Masato 東京工業大学, 大学院総合理工学研究科, 助教 (20251663)
• Co-Investigator(Renkei-kenkyūsha): HORIOKA Kazuhiko 東京工業大学, 大学院総合理工学研究科, 教授 (10126328) ; KAWAMURA Tohru 東京工業大学, 大学院総合理工学研究科, 講師 (10370214)
• Research Collaborator: SAKAI Yuusuke ; Vrba Pavel
• Project Period (FY): 2014-04-01 – 2016-03-31
• Keywords: レーザ / キャピラリー放電 / パルスパワー / 電力変換

Outline of Final Research Achievements

In the study on capillary discharge soft x-ray laser, neon-like argon electron collision excitation soft x-ray laser at 46.9 nm has been already realized. In order to shorten the laser wavelength, hydrogen-like nitrogen recombination soft x-ray laser at 13.4 nm was proposed, however, it does not realized yet. In this research, applying uniform axial magnetic field, increased radiation around 13.4 nm was observed by generation of concave electron density distribution on axis, however, lasing could not be realized. The reason why no lasing was observed was estimated as follows: plasma-wall interaction was increased by high current capillary discharge and the ablated material of capillary inner wall prevented the plasma temperature at the maximum pinch from attaining the required value and the resulted hydrogen-like nitrogen ion density was quite less than that required for lasing.

Free Research Field

工学