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Title: ALT-I pump limiter experiments with ICRF heating on TEXTOR

Abstract

The ALT-I (Advanced Limiter Test-I) was installed on TEXTOR to benchmark the ability of a pump limiter as an efficient particle collector and to determine the physics of pump limiter operation. Experiments continue to show its capability of removing particles from the plasma edge under different operating conditions. In this paper we report first experimental results using ALT-I in conjunction with high power ICRF heating. The particle removal rate increases as the edge flux and density increase during the ICRF pulse. For a head geometry that collects flux from both electron and ion drift sides, the plasma temperature rise is asymmetric with electron temperature on the electron side increasing more than on the ion side during the ICRF pulse. When ALT-I is the major limiter, the particle fluxes on both sides increase by about the same factor and the particle flux on the ion side is always larger, by a factor of 1.5 to 2 than on the electron side during both ohmic and ICRF periods. The degradation of particle confinement inferred from Langmuir probe measurement is more than a factor of two at a maximum achieved power of 2 MW.

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
California Univ., Los Angeles (USA). Center for Plasma Physics and Fusion Engineering; Kernforschungsanlage Juelich G.m.b.H. (Germany, F.R.); Sandia National Labs., Livermore, CA (USA)
OSTI Identifier:
5725212
Report Number(s):
UCLA/PPG-968; CONF-860522-4
ON: DE86010914
DOE Contract Number:  
FG03-85ER51069
Resource Type:
Conference
Resource Relation:
Conference: 7. international conference on plasma surface interactions in controlled fusion devices, Princeton, NJ, USA, 5 May 1986
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; LIMITERS; TEST FACILITIES; TEXTOR TOKAMAK; ELECTRON TEMPERATURE; ICR HEATING; JOULE HEATING; LANGMUIR PROBE; VACUUM SYSTEMS; CLOSED PLASMA DEVICES; ELECTRIC HEATING; ELECTRIC PROBES; HEATING; HIGH-FREQUENCY HEATING; PLASMA HEATING; PROBES; RESISTANCE HEATING; THERMONUCLEAR DEVICES; TOKAMAK DEVICES; 700209* - Fusion Power Plant Technology- Component Development & Materials Testing

Citation Formats

Leung, W K, Goebel, D M, Conn, R W, Dippel, K H, Finken, K H, and Thomas, G J. ALT-I pump limiter experiments with ICRF heating on TEXTOR. United States: N. p., 1986. Web.
Leung, W K, Goebel, D M, Conn, R W, Dippel, K H, Finken, K H, & Thomas, G J. ALT-I pump limiter experiments with ICRF heating on TEXTOR. United States.
Leung, W K, Goebel, D M, Conn, R W, Dippel, K H, Finken, K H, and Thomas, G J. 1986. "ALT-I pump limiter experiments with ICRF heating on TEXTOR". United States. https://www.osti.gov/servlets/purl/5725212.
@article{osti_5725212,
title = {ALT-I pump limiter experiments with ICRF heating on TEXTOR},
author = {Leung, W K and Goebel, D M and Conn, R W and Dippel, K H and Finken, K H and Thomas, G J},
abstractNote = {The ALT-I (Advanced Limiter Test-I) was installed on TEXTOR to benchmark the ability of a pump limiter as an efficient particle collector and to determine the physics of pump limiter operation. Experiments continue to show its capability of removing particles from the plasma edge under different operating conditions. In this paper we report first experimental results using ALT-I in conjunction with high power ICRF heating. The particle removal rate increases as the edge flux and density increase during the ICRF pulse. For a head geometry that collects flux from both electron and ion drift sides, the plasma temperature rise is asymmetric with electron temperature on the electron side increasing more than on the ion side during the ICRF pulse. When ALT-I is the major limiter, the particle fluxes on both sides increase by about the same factor and the particle flux on the ion side is always larger, by a factor of 1.5 to 2 than on the electron side during both ohmic and ICRF periods. The degradation of particle confinement inferred from Langmuir probe measurement is more than a factor of two at a maximum achieved power of 2 MW.},
doi = {},
url = {https://www.osti.gov/biblio/5725212}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu May 01 00:00:00 EDT 1986},
month = {Thu May 01 00:00:00 EDT 1986}
}

Conference:
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