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Control of field-reversed configurations through a translation process

Author: Hirotoshi Uriu
Requested Type: Poster Only
Submitted: 2011-06-10 10:41:47

Co-authors: T. Asai, H. Tomuro, J. Sekiguchi, Ts. Takahashi, M. Inomoto, To. Takahashi

Contact Info:
Nihon University
1-8-14 Kanda-Surugadai
Chiyoda-ku, Tokyo   101-830
Japan

Abstract Text:
Field-reversed configuration is an elongated compact toroid which is formed with no or modest toroidal magnetic field. The unique feature of the FRC is axial translation with the velocity which reaches the Alfven speed. To control the plasma parameters such as density, temperature and magnetic flux, the translation process has received renewed interest.
Translation into the neutral gas atmosphere produces NBI-like particle injection into the translated FRC with the relative velocity. This has made density build-up and extended onset time of n = 2 rotational instability. Also to control translation velocity, the effect of metallic chamber and coil spool have been investigated. A deceleration force produced by the induced currents could become approximately 10% of the acceleration one generated by the gradient of the magnetic guide field. To investigate these effects experimentally, FRC translation was performed with a toroidal cut on the coil spool. In this case, typical translation velocity was increased from 100 to 150 km/s.
Control of aspect ratio has also been tried in a translation process to apply inductive current drive on the theta-pinch based high-density and high-temperature FRC. To install center solenoid, a FRC is injected into the “fat” confinement region in the new FRC device named FAT (FRC Amplification via Translation/Transformer) which has the aspect ratio of about 1.0 for its translation region.

Characterization: A2,D3

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