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Oct 13 – 18, 2014
Hotel Park Inn Pribaltiyskaya
Europe/Moscow timezone

Improved beta (local beta > 1) and density in electron cyclotron resonance heating on the RT-1 magnetosphere plasma

Oct 15, 2014, 8:30 AM
4h
Green 8-9 (Hotel Park Inn Pribaltiyskaya)

Green 8-9

Hotel Park Inn Pribaltiyskaya

Saint Petersburg, Russian Federation
Poster ICC - Innovative Confinement Concepts Poster 3

Speaker

Dr Masaki Nishiura (The University of Tokyo)

Description

This study reports the recent progress in improved plasma parameters of the RT-1 device. Increased input power and the optimized polarization of electron cyclotron resonance heating (ECRH) with an 8.2 GHz klystron produced a significant increase in electron beta, which is evaluated by an equilibrium analysis of Grad-Shafranov equation. The peak value of the local electron beta e was found to exceed 1. In the high beta and high-density regime, the density limit was observed for H, D, and He plasmas. The line average density was close to the cutoff density for 8.2 GHz ECRH. A density limit exists even at the low beta region. This result indicates the density limit is caused by the cutoff density rather than the beta limit. From the analysis of interferometer data, the uphill diffusion produces a peaked density profile beyond the cutoff density.
Paper Number PD/P3-1
Country or International Organisation Japan

Primary author

Dr Masaki Nishiura (The University of Tokyo)

Co-authors

Mr Haruhiko Saitoh (University of Tokyo) Mr Miyuri Yamasaki (The University of Tokyo) Mr Tomohisa Nogami (The University of Tokyo) Dr Yohei Kawazura (The University of Tokyo) Dr Yoshihisa Yano (The University of Tokyo) Prof. Zensho Yoshida (The University of Tokyo)

Presentation materials