Research Project
Grant-in-Aid for Challenging Exploratory Research
The purpose of this study is to develop a diagnostic method to measure the temporal evolution of the electron velocity distribution (EVD) and to reveal electron dynamics during the non-inductive startup phase of a tokamak plasma using ECH. We obtained the following results. (1)A polarization spectroscopy system that can detect a polarization degree of less than 1% in atomic emission lines was developed. (2)A method to reduce the instrumental polarization produced by birefringence of the window and reflection at the vacuum chamber surface was established. (3)Polarization in helium atom emission lines was observed in an ECH plasma having parameters comparable to ECH tokamak plasmas. (4)The feasibility of collisional-radiative modeling required for the evaluation of the EVD shape was verified.
All 2018 2017 2016 Other
All Journal Article (3 results) (of which Peer Reviewed: 3 results, Acknowledgement Compliant: 1 results) Presentation (11 results) (of which Int'l Joint Research: 4 results, Invited: 1 results) Remarks (2 results)
Japanese Journal of Applied Physics
Volume: 56 Issue: 9 Pages: 096101-096101
10.7567/jjap.56.096101
210000148280
Applied Physics Letters
Volume: 111 Issue: 7 Pages: 074101-074101
10.1063/1.4998969
Rev. Sci. Instrum.
Volume: 87 Issue: 10 Pages: 103507-103507
10.1063/1.4965976
http://oel.me.kyoto-u.ac.jp/
