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

Journal Article · Fri Sep 28 00:00:00 EDT 2007 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.2800521· OSTI ID:21035896

Henderson, M A; Chavan, R; Bertizzolo, R; Duron, J; Landis, J -D; Sauter, O; Sanchez, F; Shidara, H; Udintsev, V S; Zucca, C ^[1]; Bruschi, A; Criant, S; Farina, D; Ramponi, G ^[2]; Heidinger, R ^[3]; Poli, E; Zohm, H ^[4]; Saibene, G ^[5]

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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)

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.

• OSTI ID: 21035896
• Journal Information: AIP Conference Proceedings, Vol. 933, 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); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

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