skip to main content

SciTech ConnectSciTech Connect

Title: Enhanced loss of magnetic-mirror-trapped fast electrons by a shear Alfvén wave

Laboratory observations of enhanced loss of magnetic mirror trapped fast electrons irradiated by a shear Alfvén Wave (SAW) are reported. The experiment is performed in the quiescent after-glow plasma in the Large Plasma Device [Gekelman et al., Rev. Sci. Instrum. 62(12), 2875–2883 (1991)]. A trapped energetic electron population (>100 keV) is generated in a magnetic mirror section (mirror ratio ≈ 2, length = 3.5 m) by an X-mode high power microwave pulse, and forms a hot electron ring due to the grad-B and curvature drift. SAWs of arbitrary polarization are launched externally by a Rotating Magnetic Field source (δB/B{sub 0} ≈ 0.1%, λ{sub ∥} ≈ 9 m). Irradiated by a right-handed circularly polarized SAW, the loss of electrons, in both the radial and the axial direction of the mirror field, is significantly enhanced and is modulated at f{sub Alfvén}. The periodical loss continues even after the termination of the SAW. Experimental observations suggest that a spatial distortion of the ring is formed in the SAW field and creates a collective mode of the hot electron population that degrades its confinement and leads to electron loss from the magnetic mirror. The results could have implications on techniques of radiation belt remediation.
Authors:
; ;  [1] ;  [2]
  1. Department of Physics and Astronomy, University of California, Los Angeles, California 90095 (United States)
  2. Department of Physics and Astronomy, University of Maryland, College Park, Maryland 20742 (United States)
Publication Date:
OSTI Identifier:
22252975
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 21; Journal Issue: 5; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ELECTRON LOSS; ELECTRON RINGS; IRRADIATION; LOSSES; MAGNETIC FIELDS; MAGNETIC MIRRORS; MICROWAVE RADIATION; PERIODICITY; PLASMA; PLASMA CONFINEMENT; POLARIZATION; RADIATION BELTS; REMEDIAL ACTION; SHEAR; TAIL ELECTRONS; TRAPPING