Investigation of RF-enhanced plasma potentials on Alcator C-Mod

R. Ochoukov; D. G. Whyte; D. Brunner; I. Cziegler; B. LaBombard; B. Lipschultz; J. Myra; J. Terry; S. Wukitch

doi:10.1016/j.jnucmat.2013.01.189

Investigation of RF-enhanced plasma potentials on Alcator C-Mod

R. Ochoukov^*, D. G. Whyte, D. Brunner, I. Cziegler, B. LaBombard, B. Lipschultz, J. Myra, J. Terry, S. Wukitch

^*Corresponding author for this work

Physics

Research output: Contribution to journal › Article › peer-review

Abstract

Radio frequency (RF) sheath rectification is a leading mechanism suspected of causing anomalously high erosion of plasma facing materials in RF-heated plasmas on Alcator C-Mod. An extensive experimental survey of the plasma potential (U_P) in RF-heated discharges on C-Mod reveals that significant U_P enhancement (>100V) is found on outboard limiter surfaces, both mapped and not mapped to active RF antennas. Surfaces that magnetically map to active RF antennas show U_P enhancement that is, in part, consistent with the recently proposed slow wave rectification mechanism. Surfaces that do not map to active RF antennas also experience significant U_P enhancement, which strongly correlates with the local fast wave intensity. In this case, fast wave rectification is a leading candidate mechanism responsible for the observed enhancement.

Original language	English
Pages (from-to)	S875–S878
Journal	Journal of Nuclear Materials
Volume	438
Issue number	SUPPL
DOIs	https://doi.org/10.1016/j.jnucmat.2013.01.189
Publication status	Published - 30 Jan 2013

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title = "Investigation of RF-enhanced plasma potentials on Alcator C-Mod",

abstract = "Radio frequency (RF) sheath rectification is a leading mechanism suspected of causing anomalously high erosion of plasma facing materials in RF-heated plasmas on Alcator C-Mod. An extensive experimental survey of the plasma potential (UP) in RF-heated discharges on C-Mod reveals that significant UP enhancement (>100V) is found on outboard limiter surfaces, both mapped and not mapped to active RF antennas. Surfaces that magnetically map to active RF antennas show UP enhancement that is, in part, consistent with the recently proposed slow wave rectification mechanism. Surfaces that do not map to active RF antennas also experience significant UP enhancement, which strongly correlates with the local fast wave intensity. In this case, fast wave rectification is a leading candidate mechanism responsible for the observed enhancement.",

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T1 - Investigation of RF-enhanced plasma potentials on Alcator C-Mod

AU - Ochoukov, R.

AU - Whyte, D. G.

AU - Brunner, D.

AU - Cziegler, I.

AU - LaBombard, B.

AU - Lipschultz, B.

AU - Myra, J.

AU - Terry, J.

AU - Wukitch, S.

PY - 2013/1/30

Y1 - 2013/1/30

N2 - Radio frequency (RF) sheath rectification is a leading mechanism suspected of causing anomalously high erosion of plasma facing materials in RF-heated plasmas on Alcator C-Mod. An extensive experimental survey of the plasma potential (UP) in RF-heated discharges on C-Mod reveals that significant UP enhancement (>100V) is found on outboard limiter surfaces, both mapped and not mapped to active RF antennas. Surfaces that magnetically map to active RF antennas show UP enhancement that is, in part, consistent with the recently proposed slow wave rectification mechanism. Surfaces that do not map to active RF antennas also experience significant UP enhancement, which strongly correlates with the local fast wave intensity. In this case, fast wave rectification is a leading candidate mechanism responsible for the observed enhancement.

AB - Radio frequency (RF) sheath rectification is a leading mechanism suspected of causing anomalously high erosion of plasma facing materials in RF-heated plasmas on Alcator C-Mod. An extensive experimental survey of the plasma potential (UP) in RF-heated discharges on C-Mod reveals that significant UP enhancement (>100V) is found on outboard limiter surfaces, both mapped and not mapped to active RF antennas. Surfaces that magnetically map to active RF antennas show UP enhancement that is, in part, consistent with the recently proposed slow wave rectification mechanism. Surfaces that do not map to active RF antennas also experience significant UP enhancement, which strongly correlates with the local fast wave intensity. In this case, fast wave rectification is a leading candidate mechanism responsible for the observed enhancement.

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Investigation of RF-enhanced plasma potentials on Alcator C-Mod

Abstract

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