Electron heating and superthermal electron enhancement due to electron cyclotron heating in ISX-B at 28 GHz
A series of electron cyclotron heating (ECH) experiments was performed with a 28-GHz gyrotron on the Impurity Study Experiment (ISX-B) tokamak at Oak Ridge National Laboratory. Up to 70 kW of microwave power was injected into ISX-B from the high field side. Bulk heating was observed with a central temperature rise of approx. 370 eV from an original temperature of approx. 600 eV, as measured by Thomson scattering. With ECH and under low density conditions, large nonthermal signals were observed on electron cyclotron emission diagnostics at the first, second, and third harmonics. These signals sometimes became quite large after the end of the ECH pulse. The effects observed can be attributed to relatively small changes in the electron distribution function. The temporal behavior of the enhanced emission is tentatively attributed to the pitch angle scattering of superthermal electrons.
- Research Organization:
- Oak Ridge National Lab., TN (USA)
- DOE Contract Number:
- W-7405-ENG-26
- OSTI ID:
- 6296208
- Report Number(s):
- ORNL/TM-8403; ON: DE83012307
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
700101* -- Fusion Energy-- Plasma Research-- Confinement
Heating
& Production
DISTRIBUTION FUNCTIONS
ECR HEATING
ELECTRONS
ELEMENTARY PARTICLES
FERMIONS
FUNCTIONS
HEATING
HIGH-FREQUENCY HEATING
INELASTIC SCATTERING
ISX TOKAMAK
LEPTONS
PLASMA DIAGNOSTICS
PLASMA HEATING
SCATTERING
THERMONUCLEAR REACTORS
THOMSON SCATTERING
TOKAMAK TYPE REACTORS