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Title: ECRH and ECCD at W7-AS, prospects for W7-X

Abstract

ECRH is the main heating method for both the W7-AS stellarator, which is operational, and W7-X, which is under construction. An overview on physics studies on Electron Cyclotron Resonance Heating (ECRH) and ECCurrent Drive (ECCD) in an extended parameter range at W7-AS is presented. Experiments were performed with an upgraded ECRH power of up to 1.3 MW at 140 GHz. Electron temperatures of up to 5.7 keV were measured, which can only be explained by the beneficial effect of positive radial electric fields ('electron root'). ECCD experiments at high power density are discussed, where the assumptions of quasi-linear theory are violated. The results from W7-AS establish the experimental and technological basis for W7-X, which aimes at demonstrating the inherent steady state capabality of stellarators at reactor relevant plasma parameters. The status of the design and construction of the ECRH system for W7-X is presented.

Authors:
; ;  [1]; ;  [2];  [3]
  1. Max-Planck-Institut fuer Plasmasphysik, EURATOM Ass., 85748 Garching (Germany)
  2. Forschungszentrum Karlsruhe, Ass. EURATOM FZK, PMW, 76021 Karlsruhe (Germany)
  3. Institut fuer Plasmaforschung, Universitaet Stuttgart, 70569 Stuttgart (Germany)
Publication Date:
OSTI Identifier:
21210456
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 485; Journal Issue: 1; Conference: 13. topical conference on radio frequency power in plasmas, Annapolis, MD (United States), 12-14 Apr 1999; Other Information: DOI: 10.1063/1.59735; (c) 1999 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0094-243X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; DESIGN; ECR CURRENT DRIVE; ECR HEATING; ELECTRIC CURRENTS; ELECTRIC FIELDS; ELECTRON TEMPERATURE; ELECTRONS; GHZ RANGE; ION TEMPERATURE; KEV RANGE; PLASMA; RF SYSTEMS; STEADY-STATE CONDITIONS; WENDELSTEIN-7 STELLARATOR

Citation Formats

Erckmann, V., Laqua, H. P., Maassberg, H., Dammertz, G., Thumm, M., and Kasparek, W. ECRH and ECCD at W7-AS, prospects for W7-X. United States: N. p., 1999. Web. doi:10.1063/1.59735.
Erckmann, V., Laqua, H. P., Maassberg, H., Dammertz, G., Thumm, M., & Kasparek, W. ECRH and ECCD at W7-AS, prospects for W7-X. United States. doi:10.1063/1.59735.
Erckmann, V., Laqua, H. P., Maassberg, H., Dammertz, G., Thumm, M., and Kasparek, W. Mon . "ECRH and ECCD at W7-AS, prospects for W7-X". United States. doi:10.1063/1.59735.
@article{osti_21210456,
title = {ECRH and ECCD at W7-AS, prospects for W7-X},
author = {Erckmann, V. and Laqua, H. P. and Maassberg, H. and Dammertz, G. and Thumm, M. and Kasparek, W.},
abstractNote = {ECRH is the main heating method for both the W7-AS stellarator, which is operational, and W7-X, which is under construction. An overview on physics studies on Electron Cyclotron Resonance Heating (ECRH) and ECCurrent Drive (ECCD) in an extended parameter range at W7-AS is presented. Experiments were performed with an upgraded ECRH power of up to 1.3 MW at 140 GHz. Electron temperatures of up to 5.7 keV were measured, which can only be explained by the beneficial effect of positive radial electric fields ('electron root'). ECCD experiments at high power density are discussed, where the assumptions of quasi-linear theory are violated. The results from W7-AS establish the experimental and technological basis for W7-X, which aimes at demonstrating the inherent steady state capabality of stellarators at reactor relevant plasma parameters. The status of the design and construction of the ECRH system for W7-X is presented.},
doi = {10.1063/1.59735},
journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 485,
place = {United States},
year = {1999},
month = {9}
}