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Using Direct Laboratory Measurements of Electron Temperature Anisotropy to Identify the Heating Mechanism in Electron-Only Guide Field Magnetic Reconnection

Journal Article · · Physical Review Letters
 [1];  [2];  [2];  [2];  [2];  [3];  [4]
  1. West Virginia Univ., Morgantown, WV (United States); Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
  2. West Virginia Univ., Morgantown, WV (United States)
  3. Univ. of Maryland, College Park, MD (United States)
  4. Northumbria University (United Kingdom)
Anisotropic electron heating during electron-only magnetic reconnection with a large guide magnetic field is directly measured in a laboratory plasma through in situ measurements of electron velocity distribution functions. Electron heating preferentially parallel to the magnetic field is localized to one separatrix, and anisotropies of 1.5 are measured. The mechanism for electron energization is identified as the parallel reconnection electric field because of the anisotropic nature of the heating and spatial localization. These characteristics are reproduced in a 2D particle-in-cell simulation and are also consistent with numerous magnetosheath observations. A measured increase in the perpendicular temperature along both separatrices is not reproduced by our 2D simulations. Here, this work has implications for energy partition studies in magnetosheath and laboratory reconnection.
Research Organization:
Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF); National Aeronautics and Space Administration (NASA); National Science Foundation (NSF)
Grant/Contract Number:
SC0020294; AC02-09CH11466; AC02-05CH11231
OSTI ID:
2203537
Alternate ID(s):
OSTI ID: 2348950
OSTI ID: 2349309
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 15 Vol. 131; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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