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Fermi acceleration in relativistic collisionless plasma shocks correlates with anisotropic energy gains

Journal Article · · Physics of Plasmas
DOI:https://doi.org/10.1063/5.0061083· OSTI ID:1978947
 [1];  [2];  [3]
  1. Cornell University, Ithaca, NY (United States); Cornell Univ., Ithaca, NY (United States)
  2. University of Texas, Austin, TX (United States)
  3. Cornell University, Ithaca, NY (United States)
Collisionless shocks generated by two colliding relativistic electron-positron plasma shells are studied using particle-in-cell simulations. Shocks are mediated by the Weibel instability (WI), and the kinetic energy of the fastest accelerated particles is found to be anisotropically modified by WI-induced electric fields. Specifically, we show that all particles interacting with the shock bifurcate into two groups based on their final relativistic Lorentz factor γ: slow (γ < γbf) and fast (γ < γbf), where γbf is the bifurcation Lorentz factor that was found to be approximately twice the initial (upstream) Lorentz factor γ0. We have found that the kinetic energies of the slow particles are equally affected by the longitudinal and transverse components of the shock electric field, whereas the fast particles are primarily accelerated by the transverse field component.
Research Organization:
Cornell University, Ithaca, NY (United States)
Sponsoring Organization:
USDOE; USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
NA0003879
OSTI ID:
1978947
Alternate ID(s):
OSTI ID: 1831280
Journal Information:
Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 11 Vol. 28; ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

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