Laboratory study of diffusion region with electron energization during high guide field reconnection

K. Yamasaki, S. Inoue, S. Kamio, T. G. Watanabe, T. Ushiki, X. Guo, T. Sugawara, K. Matsuyama, N. Kawakami, Takuma Yamada, M. Inomoto, Y. Ono

Research output: Contribution to journalArticle

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Abstract

Floating potential profile was measured around the X-point during high guide field reconnection in UTST merging experiment where the ratio of guide field (Bg) to reconnecting magnetic field (Brec) is Bg/Brec>10. Floating potential measurement revealed that a quadrupole structure of electric potential is formed around the X-point during the fast reconnection phase due to the polarization by inductive electric field. Also, our floating potential measurement revealed the existence of parallel electric field in the vicinity of the X-point. While field-aligned components of inductive electric field (E¥ind) and electrostatic electric field (E¥es) cancel out with each other away from the X-point, E¥ind exceeds E¥es around the X-point, indicating the deviation from ideal MHD criterion within the region. The diffusion region extends in the outflow region and the scale length of region is an order of ion skin depth, which is quite different from the VTF experiment result. Based on the measured magnetic field and electric field profile, our particle trajectory analysis indicates that fast electrons with energies over 300 eV are produced within 1 μs around the X-point in the non-ideal MHD region. These results indicate that production of fast electrons or electron heating are expected to be observed in the vicinity of the X-point.

Original languageEnglish
Article number101202
JournalPhysics of Plasmas
Volume22
Issue number10
DOIs
Publication statusPublished - Oct 1 2015

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electric fields
floating
electrons
trajectory analysis
particle trajectories
profiles
magnetic fields
quadrupoles
electrostatics
deviation
heating
electric potential
polarization
ions
energy

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

Cite this

Yamasaki, K., Inoue, S., Kamio, S., Watanabe, T. G., Ushiki, T., Guo, X., ... Ono, Y. (2015). Laboratory study of diffusion region with electron energization during high guide field reconnection. Physics of Plasmas, 22(10), [101202]. https://doi.org/10.1063/1.4932345

Laboratory study of diffusion region with electron energization during high guide field reconnection. / Yamasaki, K.; Inoue, S.; Kamio, S.; Watanabe, T. G.; Ushiki, T.; Guo, X.; Sugawara, T.; Matsuyama, K.; Kawakami, N.; Yamada, Takuma; Inomoto, M.; Ono, Y.

In: Physics of Plasmas, Vol. 22, No. 10, 101202, 01.10.2015.

Research output: Contribution to journalArticle

Yamasaki, K, Inoue, S, Kamio, S, Watanabe, TG, Ushiki, T, Guo, X, Sugawara, T, Matsuyama, K, Kawakami, N, Yamada, T, Inomoto, M & Ono, Y 2015, 'Laboratory study of diffusion region with electron energization during high guide field reconnection', Physics of Plasmas, vol. 22, no. 10, 101202. https://doi.org/10.1063/1.4932345
Yamasaki, K. ; Inoue, S. ; Kamio, S. ; Watanabe, T. G. ; Ushiki, T. ; Guo, X. ; Sugawara, T. ; Matsuyama, K. ; Kawakami, N. ; Yamada, Takuma ; Inomoto, M. ; Ono, Y. / Laboratory study of diffusion region with electron energization during high guide field reconnection. In: Physics of Plasmas. 2015 ; Vol. 22, No. 10.
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