Localized electron heating during magnetic reconnection in MAST

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

Research output: Contribution to journalArticle

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

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heating
energy conversion
ions
electrons
magnetic field reconnection
toroidal plasmas
electron density profiles
Joule heating
plasma temperature
current sheets
piles
thermal energy
mean free path
electron scattering
shock
electron energy
collisions
electric fields
temperature
energy

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

Cite this

Yamada, T., Tanabe, H., Watanabe, T. G., Hayashi, Y., Imazawa, R., Inomoto, M., ... Michael, C. (2016). Localized electron heating during magnetic reconnection in MAST. Nuclear Fusion, 56(10), [106019]. https://doi.org/10.1088/0029-5515/56/10/106019

Localized electron heating during magnetic reconnection in MAST. / Yamada, Takuma; Tanabe, H.; Watanabe, T. G.; Hayashi, Y.; Imazawa, R.; Inomoto, M.; Ono, Y.; Gryaznevich, M.; Scannell, R.; Michael, C.

In: Nuclear Fusion, Vol. 56, No. 10, 106019, 16.08.2016.

Research output: Contribution to journalArticle

Yamada, T, Tanabe, H, Watanabe, TG, Hayashi, Y, Imazawa, R, Inomoto, M, Ono, Y, Gryaznevich, M, Scannell, R & Michael, C 2016, 'Localized electron heating during magnetic reconnection in MAST', Nuclear Fusion, vol. 56, no. 10, 106019. https://doi.org/10.1088/0029-5515/56/10/106019
Yamada T, Tanabe H, Watanabe TG, Hayashi Y, Imazawa R, Inomoto M et al. Localized electron heating during magnetic reconnection in MAST. Nuclear Fusion. 2016 Aug 16;56(10). 106019. https://doi.org/10.1088/0029-5515/56/10/106019
Yamada, Takuma ; Tanabe, H. ; Watanabe, T. G. ; Hayashi, Y. ; Imazawa, R. ; Inomoto, M. ; Ono, Y. ; Gryaznevich, M. ; Scannell, R. ; Michael, C. / Localized electron heating during magnetic reconnection in MAST. In: Nuclear Fusion. 2016 ; Vol. 56, No. 10.
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