Evolution of the electron temperature profile of ohmically heated plasmas in TFTR
Blackbody electron cyclotron emission was used to ascertain and study the evolution and behavior of the electron temperature profile in ohmically heated plasmas in the Tokamak Fusion Test Reactor (TFTR). The emission was measured with absolutely calibrated millimeter wavelength radiometers. The temperature profile normalized to the central temperature and minor radius is observed to broaden substantially with decreasing limiter safety factor q/sub a/, and is insensitive to the plasma minor radius. Sawtooth activity was seen in the core of most TFTR discharges and appeared to be associated with a flattening of the electron temperature profile within the plasma core where q less than or equal to 1. Two types of sawtooth behavior were identified in large TFTR plasmas (minor radius, a less than or equal to 0.8 m) : a typically 35 to 40 msec period ''normal'' sawtooth, and a ''compound'' sawtooth with 70 to 80 msec period.
- Research Organization:
- Princeton Univ., NJ (USA). Plasma Physics Lab.
- DOE Contract Number:
- AC02-76CH03073
- OSTI ID:
- 5216959
- Report Number(s):
- PPPL-2221; ON: DE85017687
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
700104* -- Fusion Energy-- Plasma Research-- Plasma Kinetics-Experimental-- (-1987)
BREMSSTRAHLUNG
CYCLOTRON RADIATION
ELECTRIC HEATING
ELECTROMAGNETIC RADIATION
ELECTRON TEMPERATURE
ENERGY
HEATING
JOULE HEATING
LIMITERS
PLASMA HEATING
Q-VALUE
RADIATIONS
RESISTANCE HEATING
TFTR TOKAMAK
THERMONUCLEAR REACTORS
TOKAMAK TYPE REACTORS