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Title: Pellet injection into ATF plasmas

Based on the favorable empirical scaling of stellarator confinement with increasing electron density, pellet fueling is expected to result in significant performance improvement of the ATF plasma. With gas-puff fueling, NBI heated plasmas in ATF are limited by a thermal collapse. Pellet fueling provides a potential means to delay this effect and gain access to the favorable high density confinement regime. To provide flexibility for optimization and physics studies, eight different pellet sizes are available. To date, line average densities of up to 4 {times} 10{sup 13} cm{sup {minus}3} have been achieved with a single pellet injected into a 0.7 MW NBI plasma at 0.95 T; the results from optimization studies with up to 1.5 MW of NBI power at 2 T will be presented.
Authors:
; ; ; ; ; ; ; ; ;  [1] ;  [2] ;  [3] ;  [4]
  1. (Oak Ridge National Lab., TN (USA))
  2. (Auburn Univ., AL (USA))
  3. (Tennessee Univ., Knoxville, TN (USA))
  4. (Kyoto Univ. (Japan))
Publication Date:
OSTI Identifier:
6930988
Report Number(s):
CONF-9003116-1; CONF-9003117--1; CONF-9003124--2
ON: DE90009229; TRN: 90-010560
DOE Contract Number:
AC05-84OR21400
Resource Type:
Conference
Resource Relation:
Conference: US-USSR exchange visit to Kharkov Physico-Technical Institute seminar; Experiments on the Wendelstein VII-AS and ATF stellerators seminar; US-USSR exchange visit to Institute of General Physics seminar, Kharkov (USSR); Munich (Germany, F.R.); Moscow (USSR), 19-20 Mar 1990; 26-28 Mar 1990; 12-16 Mar 1990
Research Org:
Oak Ridge National Lab., TN (USA)
Sponsoring Org:
DOE/ER
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ATF TORSATRON; PELLET INJECTION; BEAM INJECTION HEATING; DEUTERIUM; ECR HEATING; ELECTRON DENSITY; PERFORMANCE; PLASMA CONFINEMENT; CLOSED PLASMA DEVICES; CONFINEMENT; HEATING; HIGH-FREQUENCY HEATING; HYDROGEN ISOTOPES; ISOTOPES; LIGHT NUCLEI; NUCLEI; ODD-ODD NUCLEI; PLASMA HEATING; STABLE ISOTOPES; STELLARATORS; THERMONUCLEAR DEVICES; TORSATRON STELLARATOR 700205* -- Fusion Power Plant Technology-- Fuel, Heating, & Injection Systems