Assessment of the lifetime of Faraday shield elements

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

Assessment of the lifetime of Faraday shield elements

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

Research output: Contribution to conference › Paper › peer-review

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 language	English
Pages	921-926
Number of pages	6
State	Published - 1989
Externally published	Yes
Event	Proceedings - IEEE Thirteenth Symposium on Fusion Engineering Part 2 (of 2) - Knoxville, TN, USA Duration: Oct 2 1989 → Oct 6 1989

Conference

Conference	Proceedings - IEEE Thirteenth Symposium on Fusion Engineering Part 2 (of 2)
City	Knoxville, TN, USA
Period	10/2/89 → 10/6/89

Cite this

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title = "Assessment of the lifetime of Faraday shield elements",

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.",

author = "Caughman, {J. B.O.} and Ruzic, {D. N.} and Hoffman, {D. J.} and Langley, {R. A.} and Lewis, {M. B.} and Ryan, {P. M.}",

year = "1989",

language = "English",

pages = "921--926",

note = "Proceedings - IEEE Thirteenth Symposium on Fusion Engineering Part 2 (of 2) ; Conference date: 02-10-1989 Through 06-10-1989",

}

TY - CONF

T1 - Assessment of the lifetime of Faraday shield elements

AU - Caughman, J. B.O.

AU - Ruzic, D. N.

AU - Hoffman, D. J.

AU - Langley, R. A.

AU - Lewis, M. B.

AU - Ryan, P. M.

PY - 1989

Y1 - 1989

N2 - 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.

AB - 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.

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M3 - Paper

AN - SCOPUS:0024929252

SP - 921

EP - 926

T2 - Proceedings - IEEE Thirteenth Symposium on Fusion Engineering Part 2 (of 2)

Y2 - 2 October 1989 through 6 October 1989

ER -

Assessment of the lifetime of Faraday shield elements

Abstract

Conference

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