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Determination of the energy of suprathermal electrons during lower hybrid current drive on PBX-M

Conference ·
DOI:https://doi.org/10.2172/10159924· OSTI ID:10164895
; ; ; ; ; ;  [1];  [2];  [3];  [4];  [5]
  1. Princeton Univ., NJ (United States). Plasma Physics Lab.
  2. Massachusetts Inst. of Tech., Cambridge, MA (United States). Plasma Fusion Center
  3. Hungarian Academy of Sciences, Budapest (Hungary). Central Research Inst. for Physics
  4. JET Joint Undertaking, Abingdon (United Kingdom)
  5. Oak Ridge National Lab., TN (United States)
+ Show Author Affiliations
Suprathermal electrons are diagnosed by a hard x-ray pinhole camera during lower hybrid current drive on PBX-M. The experimental hard x-ray images are compared with simulated images, which result from an integration of the relativistic bremsstrahlung along lines-of-sight through the bean-shaped plasma. Images with centrally peaked and radially hollow radiation profiles are easily distinguished. The energy distribution of the suprathermal electrons is analyzed by comparing images taken with different absorber foils. An effective photon temperature is derived from the experimental images, and a comparison with simulated photon temperatures yields the energy of the suprathermal electrons. The analysis indicates that the energy of the suprathermal electrons in the hollow discharges is in the 50 to 100 key range in the center of the discharge. There seems to exist a very small higher energy component close to the plasma edge.
Research Organization:
Princeton Univ., NJ (United States). Plasma Physics Lab.
Sponsoring Organization:
USDOE, Washington, DC (United States)
DOE Contract Number:
AC02-76CH03073
OSTI ID:
10164895
Report Number(s):
PPPL--2910; CONF-9304112--18; ON: DE93015597
Country of Publication:
United States
Language:
English

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Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700320
700350
BREMSSTRAHLUNG
CAMERAS
COMPACT IGNITION TOKAMAK
ELECTRONS
LOWER HYBRID CURRENT DRIVE
PLASMA DIAGNOSTIC TECHNIQUES AND INSTRUMENTATION
PLASMA DIAGNOSTICS
PLASMA PRODUCTION, HEATING, CURRENT DRIVE, AND INTERACTIONS
X-RAY DETECTION