Electron cyclotron emissions from an electron cyclotron heated discharge in ISX-B

Thesis/Dissertation · Sat Jan 01 00:00:00 EST 1983

OSTI ID:6023171

Elder, G B

Observation of the electron cyclotron emissions (ECE) is especially effective when studying the effects of electron cyclotron heating (ECH). Two detectors were built to observe the optically thin third harmonic radiation from ISX B during the recent 28 GHz ECH experiments carried on at Oak Ridge National Laboratory. These detectors supplemented existing detectors at the fundamental frequency and at the second harmonic frequency. Observations of the three frequencies during and after the ECH was pulsed into the plasma showed an unexpected rise in their intensity, occurring after the ECH pulse was over. This rise lasted for many tens of milliseconds, well beyond estimates of the electron energy confinement time. The rise in the third harmonic intensity was frequently to an intensity 100 times greater than the pre-ECH intensity. The fundamental frequency and the second harmonic had a much milder change in their intensities. The rises were seen to depend critically on the density of the plasma and the length of the ECH pulse but only weakly on the pre-ECH temperature. A computer code that predicts the ECE from an electron distribution in ISX-B, taking into a account the effect of the plasma's dielectric response to the emissions from a single electron, was developed.

• Research Organization: Princeton Univ., NJ (USA)
• OSTI ID: 6023171
• Resource Relation: Other Information: Thesis (Ph. D.)
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ECR HEATING
CYCLOTRON HARMONICS
ISX TOKAMAK
CYCLOTRON FREQUENCY
DISTRIBUTION
ELECTRONS
EMISSION SPECTRA
PLASMA WAVES
ELEMENTARY PARTICLES
FERMIONS
HARMONICS
HEATING
HIGH-FREQUENCY HEATING
LEPTONS
OSCILLATIONS
PLASMA HEATING
SPECTRA
THERMONUCLEAR REACTORS
TOKAMAK TYPE REACTORS
700101* - Fusion Energy- Plasma Research- Confinement
Heating
& Production