T/sub e/ measurements using second harmonic electron cyclotron emission during high power ICRH on PLT

Journal Article · Mon Jul 01 04:00:00 EDT 1985 · AIP Conf. Proc.; (United States)

DOI:https://doi.org/10.1063/1.35228· OSTI ID:5934297

Cavallo, A; Bell, R; Colestock, P; Hosea, J; Hwang, D; Mazzucato, E; Ono, M; Wilson, J R

A ten channel grating polychromator has been used routinely to monitor T/sub e/(r) at ten different radial locations on PLT. The central value T/sub e/(o) and n-bar/sub e/ are used in conjunction with visible bremsstrahlung measurements at 5235 A to monitor Z/sub eff/. The most important results for D-/sup 3/He minority heating at P/sub R//sub F/ = 4.3 MW at 30 MHz (B/sub T/approx. =33 kG) are: 1) T/sub e/(o) increases from 1.5 keV to 3.5 keV and the stored electron energy more than doubles; 2) intense sawtooth activity is observed with ..delta..T/sub e//T/sub e/,/sub max/approx. =0.32; 3) central power deposition, as indicated by n-bar/sub e/ x dT/sub e/(o)/dt, increases by a factor of ten compared with the OH case; 4) Z/sub eff/ increases by a factor of approx.2.7 to 3 during ICRF (after heavy gettering). The T/sub e/ sawtooth behavior demonstrates substantial minority /sup 3/He ion heating of the electrons at the lower /sup 3/He concentrations in a manner similar to that expected for ..cap alpha.. particles in an ignited plasma.

• Research Organization: Princeton University
• OSTI ID: 5934297
• Journal Information: AIP Conf. Proc.; (United States), Journal Name: AIP Conf. Proc.; (United States) Vol. 129:1; ISSN APCPC
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700101* -- Fusion Energy-- Plasma Research-- Confinement
Heating
& Production
700102 -- Fusion Energy-- Plasma Research-- Diagnostics
ABSORPTION
BREMSSTRAHLUNG
CYCLOTRON HARMONICS
DATA
DEUTERIUM
ELECTROMAGNETIC RADIATION
ELECTRON TEMPERATURE
ENERGY ABSORPTION
ENERGY RANGE
EVEN-ODD NUCLEI
EXPERIMENTAL DATA
HARMONICS
HEATING
HELIUM 3
HELIUM ISOTOPES
HIGH-FREQUENCY HEATING
HYDROGEN ISOTOPES
ICR HEATING
INFORMATION
ISOTOPES
KEV RANGE
KEV RANGE 01-10
LIGHT NUCLEI
NUCLEI
NUMERICAL DATA
ODD-ODD NUCLEI
OSCILLATIONS
PLASMA
PLASMA HEATING
PLT DEVICES
POWER
RADIATIONS
RADIOWAVE RADIATION
SPECTRA
STABLE ISOTOPES
TEMPERATURE MEASUREMENT
THERMONUCLEAR REACTORS
TOKAMAK TYPE REACTORS
VISIBLE SPECTRA