Plasma and Fusion Research

Volume 14, 3401054 (2019)

Regular Articles

Experimental Study of Magnetic Reconnection in Partially Ionized Plasmas Using Rotating Magnetic Field
Yoshifumi TAKAHATA, Ryoma YANAI and Michiaki INOMOTO1)
Graduate School of Engineering, The University of Tokyo, Bunkyo, Tokyo 113-0032, Japan
1)
Graduate School of Frontier Science, The University of Tokyo, Kashiwa, Chiba 277-8561, Japan
(Received 27 December 2018 / Accepted 31 January 2019 / Published 10 April 2019)

Abstract

Experimental setup to achieve long-pulse magnetic reconnection in partially ionized plasmas was developed using the rotating magnetic field technique. Two field-reversed configuration plasmas were formed and sustained along the axial direction in the experimental vessel, and the quasi-steady magnetic reconnection condition with the ionization degree of the order of 1% was maintained for more than 20 ms between the plasmas. Time duration of magnetic reconnection longer than the ion-neutral collision time and plasma parameters where the neutral particles possibly affect the reconnection process, were achieved. Reconnection events observed under the present experimental conditions were classified into three cases according to the ionization degree, and a new experimental regime for magnetic reconnection in partially ionized plasmas was successfully demonstrated.

Keywords

magnetic reconnection, rotating magnetic field, partially ionized plasmas, ambipolar diffusion

DOI: 10.1585/pfr.14.3401054

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