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Ion and Electron Heating Characteristics of Field-Reversed Configuration (FRC) in TS-3 and TS-4 Merging Startup Experiments

Author: Yasushi Ono
Requested Type: Consider for Invited
Submitted: 2014-05-30 22:24:51

Co-authors: H. Tanabe, K. Kuwahata, M. Inomoto, C. Z. Cheng

Contact Info:
University of Tokyo
7-3-1 Hongo,
Tokyo, Tokyo   113-865
Japan

Abstract Text:
The high-power heating of magnetic reconnection has been studied during merging formation of Field-Reversed Configuration (FRC) in the TS-3 and TS-4 merging experiments. Two low-beta (~5%) spheromak plasmas with counterhelicity were formed inductively using two fluxcores with PF and TS coils and were merged together in the axial direction to form an high-beta FRC without toroidal magnetic field. The magnetic reconnection transformed all of toroidal magnetic energy and a part of poloidal magnetic energy of the spheromaks to ion thermal energy of the produced FRC. Causes and mechanisms for the huge reconnection heating (~30MW) were directly measured by two dimensional ion and electron temperature measurements. We clearly observed huge ion heating (~250eV) in the downstream of reconnection and localized electron heating (~20eV) at the X-point. The reconnection accelerated ions from X-point area to the downstream, causing huge ion heating in the downstream regions. The ion heating is probably due to viscosity damping of the reconnection outflow. On the other hand, the reconnection quickly hearted electrons at the X-point. The reconnection heating energy of teo merging spheromaks is found to scales with square of reconnection magnetic field, indicating ion acceleration of reconnection to the Alfven speed.
[1]Y. Ono et al., Plasma Phys. Cont. Fusion 54, 124039, (2012).
[2]Y. Ono et al., Phys. Rev. Lett. 107, 185001, (2011).

Characterization: 1.2

Comments:

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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