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masamune_epr_ct_ws_2014.pdf2014-08-20 20:06:21Sadao Masamune

Characterization of high-electron-poloidal-beta axisymmetric state and self-organized helical state in RELAX

Author: Sadao Masamune
Requested Type: Consider for Invited
Submitted: 2014-05-30 08:16:00

Co-authors: A. Sanpei, H. Tanaka, R. Ueba, H. Himura, N. Mizuguchi, T. Akiyama, D.J. Den Hartog, , R. Paccagnella, H. Koguchi

Contact Info:
Kyoto Institute of Technology
Matsugasaki, Sakyo-ku
Kyoto, Kyoto   606-858
Japan

Abstract Text:
Improvement of plasma performance has been advanced of the low-aspect-ratio (low-A) reversed field pinch (RFP) RELAX. In axisymmetric RFP states in deep-reversal region, central electron poloidal beta βp ( = 2u_0p_e0 /(B_pa)^2 ) has reached to about 10% with application of feedback stabilization of a single resistive wall mode (RWM). The attained region is close to where we expect sizable bootstrap current fraction in low-A RFP configuration.
In shallow-reversal region characterized by relaxation to the quasi-single helicity (QSH) state, CT technique has revealed helically deformed structure during QSH. 3-D MHD simulations using the MIPS code have shown two routes to self-organized helical state depending on the initial equilibrium; one through core-resonant tearing mode, and the other through internally non-resonant kink mode. The self-organized structure agrees well with experiments.

Characterization: 3.0

Comments:
I will have to leave Thursday evening. I would therefore appreciate it if you could assign my presentation to Thursday morning.

Workshop on Exploratory Topics in Plasma and Fusion Research (EPR) and US-Japan Compact Torus (CT) Workshop
August 5-8, 2014
Madison, Wisconsin

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