skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: The Enhanced Performance Launcher Design For The ITER Upper Port ECH Antenna

Abstract

The ITER ECH heating and current drive system delivers 24 MW (170 GHz), which can be directed to either the equatorial (EL) or upper (UL) port launching antennas depending on the desired physics application. The UL design uses two front steering (FS) mirrors that sweep eight beams in a poloidal plane providing co-ECCD over the outer half of the plasma cross section. A novel frictionless, backlash-free steering mechanism has been developed for an increased reliability and providing a steering mirror rotation of up to {+-}7 deg. ({+-}14 deg. for RF beam). The principle aim of the UL is to stabilize the neoclassical tearing modes (NTM) and (by extending the steering range) access the q = 1 flux surface for control of the sawtooth oscillation. Increasing the range of the UL can relax the EL steering range, and optimize the EL for enhanced performance with an optimized central deposition and potential for counter ECCD. This paper will summarize the present UL design status along with the proposed design modifications to the UL for enhanced performance and increased reliability.

Authors:
; ; ; ; ; ; ; ; ;  [1]; ; ; ;  [2];  [3]; ;  [4];  [5]
  1. CRPP, EURATOM-Confederation Suisse, EPFL, CH-1015 Lausanne (Switzerland)
  2. Istituto di Fisica del Plasma, EURATOM-ENEA-CNR Association, 20125 Milan (Italy)
  3. Forschungszentrum Karlsruhe, EURATOM-FZK, D-76021 Karlsruhe (Germany)
  4. EFDA Close Support Unit, Boltzmannstrasse 2, D-85748 Garching (Germany)
  5. IPP-Garching, Max Planck-Institut fuer Plasmaphysik, D-85748 Garching (Germany)
Publication Date:
OSTI Identifier:
21035896
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 933; Journal Issue: 1; Conference: 17. topical conference on radio frequency power in plasmas, Clearwater, FL (United States), 7-9 May 2007; Other Information: DOI: 10.1063/1.2800521; (c) 2007 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; DESIGN; ECR CURRENT DRIVE; ECR HEATING; ELECTRIC CURRENTS; GHZ RANGE; ITER TOKAMAK; MAGNETIC SURFACES; NEOCLASSICAL TRANSPORT THEORY; PERFORMANCE; PLASMA; PLASMA POTENTIAL; RF SYSTEMS; ROTATION; SAWTOOTH OSCILLATIONS; TEARING INSTABILITY

Citation Formats

Henderson, M A, Chavan, R, Bertizzolo, R, Duron, J, Landis, J -D, Sauter, O, Sanchez, F, Shidara, H, Udintsev, V S, Zucca, C, Bruschi, A, Criant, S, Farina, D, Ramponi, G, Heidinger, R, Poli, E, Zohm, H, and Saibene, G. The Enhanced Performance Launcher Design For The ITER Upper Port ECH Antenna. United States: N. p., 2007. Web. doi:10.1063/1.2800521.
Henderson, M A, Chavan, R, Bertizzolo, R, Duron, J, Landis, J -D, Sauter, O, Sanchez, F, Shidara, H, Udintsev, V S, Zucca, C, Bruschi, A, Criant, S, Farina, D, Ramponi, G, Heidinger, R, Poli, E, Zohm, H, & Saibene, G. The Enhanced Performance Launcher Design For The ITER Upper Port ECH Antenna. United States. https://doi.org/10.1063/1.2800521
Henderson, M A, Chavan, R, Bertizzolo, R, Duron, J, Landis, J -D, Sauter, O, Sanchez, F, Shidara, H, Udintsev, V S, Zucca, C, Bruschi, A, Criant, S, Farina, D, Ramponi, G, Heidinger, R, Poli, E, Zohm, H, and Saibene, G. 2007. "The Enhanced Performance Launcher Design For The ITER Upper Port ECH Antenna". United States. https://doi.org/10.1063/1.2800521.
@article{osti_21035896,
title = {The Enhanced Performance Launcher Design For The ITER Upper Port ECH Antenna},
author = {Henderson, M A and Chavan, R and Bertizzolo, R and Duron, J and Landis, J -D and Sauter, O and Sanchez, F and Shidara, H and Udintsev, V S and Zucca, C and Bruschi, A and Criant, S and Farina, D and Ramponi, G and Heidinger, R and Poli, E and Zohm, H and Saibene, G},
abstractNote = {The ITER ECH heating and current drive system delivers 24 MW (170 GHz), which can be directed to either the equatorial (EL) or upper (UL) port launching antennas depending on the desired physics application. The UL design uses two front steering (FS) mirrors that sweep eight beams in a poloidal plane providing co-ECCD over the outer half of the plasma cross section. A novel frictionless, backlash-free steering mechanism has been developed for an increased reliability and providing a steering mirror rotation of up to {+-}7 deg. ({+-}14 deg. for RF beam). The principle aim of the UL is to stabilize the neoclassical tearing modes (NTM) and (by extending the steering range) access the q = 1 flux surface for control of the sawtooth oscillation. Increasing the range of the UL can relax the EL steering range, and optimize the EL for enhanced performance with an optimized central deposition and potential for counter ECCD. This paper will summarize the present UL design status along with the proposed design modifications to the UL for enhanced performance and increased reliability.},
doi = {10.1063/1.2800521},
url = {https://www.osti.gov/biblio/21035896}, journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 933,
place = {United States},
year = {2007},
month = {9}
}