Measurement of rf voltages on the plasma-touching surfaces of ICRF antennas
Measurements of the rf voltages on Faraday shields and protection bumpers have been made for several loop antennas, including the mock-up antenna and Al for JET, the original antenna for Tore Supra, the present ASDEX-U antenna, and the folded waveguide. The loop antennas show voltages that scale to {approx}12 kV for a maximum input voltage of 30 kV with 0/0 phasing. The voltages are dramatically reduced for 0/{pi} phasing. These voltages are significant in that they can substantially increase the rf sheath potential beyond the levels associated with the simple electromagnetic field linkage from the current straps that results in plasma heating. In this paper, we investigate and measure the source of these voltages, their scaling with antenna impedance, and the differences between the loop arrays.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 110236
- Report Number(s):
- CONF-9505105-17; ON: DE95017400; TRN: 95:021969
- Resource Relation:
- Conference: 11. topical conference on radio frequency in plasmas, Palm Springs, CA (United States), 17-19 May 1995; Other Information: PBD: [1995]
- Country of Publication:
- United States
- Language:
- English
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