Edge ion dynamics in H-mode discharges in DIII-D
The goal of this paper is to present detailed measurements of T{sub i} and E{sub r} at the plasma edge in L- and H-mode with high spatial resolution in order the study the edge ion dynamics. Of primary interest is the relationship between T{sub i} and E{sub r} and the behavior of the edge T{sub i} profile in H-mode. The principle findings are: there appears to be a threshold temperature for T{sub i} required for the transition to occur with T{sub i} at the LCFS in the range of 0.2--0.3 keV at the transition; a correlation between the edge E{sub r} profile and the edge T{sub i} profile has been observed; and values of T{sub i} of 2--3 keV within a few cm of the LCFS and of dT{sub i}/dr of up to 1 keV/cm are observed in the transport barrier in H-mode, with the scale length for T{sub i} being of the order of a poloidal gyroradius.
- Research Organization:
- General Atomics, San Diego, CA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC03-89ER51114
- OSTI ID:
- 10158754
- Report Number(s):
- GA-A-20912; CONF-920610-5; ON: DE92016255
- Resource Relation:
- Conference: ICPP 92: International conference on plasma physics,Innsbruck (Austria),29 Jun - 3 Jul 1992; Other Information: PBD: May 1992
- Country of Publication:
- United States
- Language:
- English
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