Localized electron heating during magnetic reconnection in MAST

T. Yamada, H. Tanabe, T. G. Watanabe, Y. Hayashi, R. Imazawa, M. Inomoto, Y. Ono, M. Gryaznevich, R. Scannell, C. Michael

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5 Citations (Scopus)

Abstract

Significant increase in the plasma temperature above 1 keV was measured during the kilogauss magnetic field reconnection of two merging toroidal plasmas under the high-guide field and collision-less conditions. The electron temperature was observed to peak significantly at the X-point inside the current sheet, indicating Joule heating caused by the toroidal electric field along the X-line. This peaked temperature increases significantly with the guide field, in agreement with the electron mean-free path calculation. The slow electron heating in the downstream suggests energy conversion from ions to electrons through ion-electron collisions in the bulk plasma as the second electron heating mechanism in the bulk plasma. The electron density profile clearly reveals the electron density pile-up / fast shock structures in the downstream of reconnection, suggesting energy conversion from ion flow energy to ion thermal energy as well as significant ion heating by reconnection outflow.

Original languageEnglish
Article number106019
JournalNuclear Fusion
Volume56
Issue number10
DOIs
Publication statusPublished - Aug 16 2016

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

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