Electrical optimization of the ICH antenna array for ITER

Conference · Fri Aug 01 04:00:00 EDT 1997

OSTI ID:510439

Ryan, P M; Swain, D W; Carter, M D; Taylor, D J ^[1]; Bosia, G ^[2]

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1. Oak Ridge National Lab., TN (United States)
2. ITER Joint Central Team, Garching (Germany)

The present design of the ITER ICH antenna array comprises two poloidal by four toroidal current elements in each of four ports.Each current element forms a resonant double loop (RDL) with power fed to a pretuned matchpoint on the strap; the matching is accomplished using slow-wave transmission lines as adjustable shorted-stub tuners on either end of the current strap. The power requirement is 12.5 MW per port over the frequency range of 40--70 MHz, with extended operation to 80 MHz desirable. The antenna design optimization process includes (1) strap shaping to minimize strap voltages and rf E-fields along B-field lines and (2) frame/Faraday shield geometry design to improve plasma coupling, wave spectrum directivity, and phase control. For the ignited plasma parameters, the optimized array design delivers full power over the ranges of 40--80 MHz in frequency and 0{degree} to 180{degree} in phase. The maximum strap voltage is 41 kV and the maximum parallel E-field is 16 kV/cm for the worst case over these ranges. The array directivity for current drive operation is calculated to be close to 80%.

• Research Organization: Oak Ridge National Lab., TN (United States)
• Sponsoring Organization: USDOE Office of Energy Research, Washington, DC (United States)
• DOE Contract Number: AC05-96OR22464
• OSTI ID: 510439
• Report Number(s): CONF-9704102--15; ON: DE97007770
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ANTENNAS
DESIGN
ELECTRICAL PROPERTIES
ICR HEATING
ITER TOKAMAK
OPTIMIZATION
SHIELDS