Assessment of the lifetime of Faraday shield elements

J. B.O. Caughman, David N Ruzic, D. J. Hoffman, R. A. Langley, M. B. Lewis, P. M. Ryan

Research output: Contribution to conferencePaper

Abstract

The interaction of plasma with RF fields from an ion cyclotron range of frequencies (ICRF) antenna has been studied to estimate the amount of Faraday shield erosion expected in normal ICRF heating (ICRH) operation. Plasma parameters and ion energies have been measured in the near field of an antenna and used in a model to estimate the erosion rate of the Faraday shield surface. Experiments were conducted on the RF Test Facility (RFTF), a magnetic mirror device at Oak Ridge National Laboratory (ORNL), using a single-strap resonant loop antenna with a two-tier Faraday shield. Plasma parameters and ion energies have been correlated with the antenna current and used in a computational model of the plasma sheath to predict the amount of erosion expected from the Faraday shield elements exposed to plasma. Predictions of light-ion sputtering of candidate Faraday shield materials are presented.

Original languageEnglish (US)
Pages921-926
Number of pages6
StatePublished - Dec 1 1989
EventProceedings - IEEE Thirteenth Symposium on Fusion Engineering Part 2 (of 2) - Knoxville, TN, USA
Duration: Oct 2 1989Oct 6 1989

Other

OtherProceedings - IEEE Thirteenth Symposium on Fusion Engineering Part 2 (of 2)
CityKnoxville, TN, USA
Period10/2/8910/6/89

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ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering

Cite this

Caughman, J. B. O., Ruzic, D. N., Hoffman, D. J., Langley, R. A., Lewis, M. B., & Ryan, P. M. (1989). Assessment of the lifetime of Faraday shield elements. 921-926. Paper presented at Proceedings - IEEE Thirteenth Symposium on Fusion Engineering Part 2 (of 2), Knoxville, TN, USA, .