Simulation Results for the New NSTX HHFW Antenna Straps Design by Using Microwave Studio
Authors: C.C. Kung, R. Ellis, C. Brunkhorst, N. Greenough, E. Fredd, A. Castano, D. Miller, G. D'Amico, R. Yager, J. Hosea, J.R. Wilson and P. Ryan
Abstract:
Experimental results have shown that the high harmonic fast wave (HHFW) at 30 MHz can provide substantial plasma heating and current drive for the NSTX spherical tokamak operation. However, the present antenna strap design rarely achieves the design goal of delivering the full transmitter capability of 6 MW to the plasma. In order to deliver more power to the plasma, a new antenna strap design and the associated coaxial line feeds are being constructed. This new antenna strap design features two feedthroughs to replace the old single feed-through design. In the design process, CST Microwave Studio has been used to simulate the entire new antenna strap structure including the enclosure and the Faraday shield. In this paper, the antenna strap model and the simulation results will be discussed in detail. The test results from the new antenna straps with their associated resonant loops will be presented as well.
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Presented at: 23rd Symposium on Fusion Engineering, San Diego, CA May 31-June 4, 2009.
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Download PPPL-4447 (pdf 191 KB 4 pp)
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