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Title: The Physics Performance Of The Front Steering Launcher For The ITER ECRH Upper Port

Abstract

The capability of any given e.m.-wave plasma heating system to be utilized for physics applications depends strongly on the technical properties of the launching antenna (or launcher). An effective ECH launcher must project a small mm-wave beam spot size far into the plasma and 'steer' the beam across a large fraction of the plasma cross section (along the resonance surface). Thus the choice in the launcher concept and design may either severely limit or enhance the capability of a heating system to be effectively applied for physics applications, such as sawtooth stabilization, control of the Neoclassical Tearing Mode (NTM), Edge Localized Mode (ELM) control, etc. Presently, two antenna concepts are under consideration for the ITER upper port ECH launcher: front steering (FS) and remote steering (RS) launchers. The RS launcher has the technical advantage of easier maintenance access to the steering mirror, which is isolated from the torus vacuum. The FS launcher places the steering mirror near the plasma increasing the technical challenges, but significantly enhancing the focusing and steering capabilities of the launcher, offering a threefold increase in NTM stabilization efficiency over the RS launcher as well as the potential for application to other critical physics issues such asmore » ELM or sawtooth control.« less

Authors:
; ; ; ; ;  [1];  [2];  [3];  [4]
  1. CRPP, Association EURATOM- Confederation Suisse, EPFL, CH-1015 Lausanne (Switzerland)
  2. Istituto di Fisica del Plasma, EURATOM- ENEA-CNR Association, 20125 Milan (Italy)
  3. EFDA Close Support Unit, Boltzmannstrasse 2, D-85748 Garching (Germany)
  4. IPP-Garching, Max-Planck-Institut fuer Plasmaphysik, D-85748 Garching (Germany)
Publication Date:
OSTI Identifier:
20726354
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 787; Journal Issue: 1; Conference: 16. topical conference on radio frequency power in plasmas, Park City, UT (United States), 11-13 Apr 2005; Other Information: DOI: 10.1063/1.2098427; (c) 2005 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; ANTENNAS; CONTROL; DESIGN; ECR HEATING; EDGE LOCALIZED MODES; EFFICIENCY; HEATING SYSTEMS; ITER TOKAMAK; NEOCLASSICAL TRANSPORT THEORY; PERFORMANCE; PLASMA; RESONANCE; RF SYSTEMS; SAWTOOTH OSCILLATIONS; TEARING INSTABILITY

Citation Formats

Henderson, M, Chavan, R, Nikkola, P, Sanchez, F, Sauter, O, Shidara, H, Ramponi, G, Saibene, G, and Zohm, H. The Physics Performance Of The Front Steering Launcher For The ITER ECRH Upper Port. United States: N. p., 2005. Web. doi:10.1063/1.2098427.
Henderson, M, Chavan, R, Nikkola, P, Sanchez, F, Sauter, O, Shidara, H, Ramponi, G, Saibene, G, & Zohm, H. The Physics Performance Of The Front Steering Launcher For The ITER ECRH Upper Port. United States. https://doi.org/10.1063/1.2098427
Henderson, M, Chavan, R, Nikkola, P, Sanchez, F, Sauter, O, Shidara, H, Ramponi, G, Saibene, G, and Zohm, H. 2005. "The Physics Performance Of The Front Steering Launcher For The ITER ECRH Upper Port". United States. https://doi.org/10.1063/1.2098427.
@article{osti_20726354,
title = {The Physics Performance Of The Front Steering Launcher For The ITER ECRH Upper Port},
author = {Henderson, M and Chavan, R and Nikkola, P and Sanchez, F and Sauter, O and Shidara, H and Ramponi, G and Saibene, G and Zohm, H},
abstractNote = {The capability of any given e.m.-wave plasma heating system to be utilized for physics applications depends strongly on the technical properties of the launching antenna (or launcher). An effective ECH launcher must project a small mm-wave beam spot size far into the plasma and 'steer' the beam across a large fraction of the plasma cross section (along the resonance surface). Thus the choice in the launcher concept and design may either severely limit or enhance the capability of a heating system to be effectively applied for physics applications, such as sawtooth stabilization, control of the Neoclassical Tearing Mode (NTM), Edge Localized Mode (ELM) control, etc. Presently, two antenna concepts are under consideration for the ITER upper port ECH launcher: front steering (FS) and remote steering (RS) launchers. The RS launcher has the technical advantage of easier maintenance access to the steering mirror, which is isolated from the torus vacuum. The FS launcher places the steering mirror near the plasma increasing the technical challenges, but significantly enhancing the focusing and steering capabilities of the launcher, offering a threefold increase in NTM stabilization efficiency over the RS launcher as well as the potential for application to other critical physics issues such as ELM or sawtooth control.},
doi = {10.1063/1.2098427},
url = {https://www.osti.gov/biblio/20726354}, journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 787,
place = {United States},
year = {2005},
month = {9}
}