ICRF-Induced Changes in Floating Potential and Ion Saturation Current in the EAST Divertor

Rory Perkins; Joel Hosea; Gary Taylor; Nicola Bertelli; Gerrit Kramer; Chengming Qin; Liang Wang; Jichan Yang; Xinjun Zhang

doi:10.1051/epjconf/201715703039

ICRF-Induced Changes in Floating Potential and Ion Saturation Current in the EAST Divertor

Rory Perkins, Joel Hosea, Gary Taylor, Nicola Bertelli, Gerrit Kramer, Chengming Qin, Liang Wang, Jichan Yang, Xinjun Zhang

Research output: Contribution to journal › Conference article › peer-review

5 Scopus citations

Abstract

Injection of waves in the ion cyclotron range of frequencies (ICRF) into a tokamak can potentially raise the plasma potential via RF rectification. Probes are affected both by changes in plasma potential and also by RF-averaging of the probe characteristic, with the latter tending to drop the floating potential. We present the effect of ICRF heating on divertor Langmuir probes in the EAST experiment. Over a scan of the outer gap, probes connected to the antennas have increases in floating potential with ICRF, but probes in between the outer-vessel strike point and flux surface tangent to the antenna have decreased floating potential. This behaviour is investigated using field-line mapping. Preliminary results show that mdiplane gas puffing can suppress the strong influence of ICRF on the probes' floating potential.

Original language	English (US)
Article number	03039
Journal	EPJ Web of Conferences
Volume	157
DOIs	https://doi.org/10.1051/epjconf/201715703039
State	Published - Oct 23 2017
Event	22nd Topical Conference on Radio-Frequency Power in Plasmas 2017 - Aix en Provence, France Duration: May 30 2017 → Jun 2 2017

All Science Journal Classification (ASJC) codes

General Physics and Astronomy

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10.1051/epjconf/201715703039

Cite this

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title = "ICRF-Induced Changes in Floating Potential and Ion Saturation Current in the EAST Divertor",

abstract = "Injection of waves in the ion cyclotron range of frequencies (ICRF) into a tokamak can potentially raise the plasma potential via RF rectification. Probes are affected both by changes in plasma potential and also by RF-averaging of the probe characteristic, with the latter tending to drop the floating potential. We present the effect of ICRF heating on divertor Langmuir probes in the EAST experiment. Over a scan of the outer gap, probes connected to the antennas have increases in floating potential with ICRF, but probes in between the outer-vessel strike point and flux surface tangent to the antenna have decreased floating potential. This behaviour is investigated using field-line mapping. Preliminary results show that mdiplane gas puffing can suppress the strong influence of ICRF on the probes' floating potential.",

author = "Rory Perkins and Joel Hosea and Gary Taylor and Nicola Bertelli and Gerrit Kramer and Chengming Qin and Liang Wang and Jichan Yang and Xinjun Zhang",

note = "Publisher Copyright: {\textcopyright} 2017 The authors, published by EDP Sciences.; 22nd Topical Conference on Radio-Frequency Power in Plasmas 2017 ; Conference date: 30-05-2017 Through 02-06-2017",

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doi = "10.1051/epjconf/201715703039",

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TY - JOUR

T1 - ICRF-Induced Changes in Floating Potential and Ion Saturation Current in the EAST Divertor

AU - Perkins, Rory

AU - Hosea, Joel

AU - Taylor, Gary

AU - Bertelli, Nicola

AU - Kramer, Gerrit

AU - Qin, Chengming

AU - Wang, Liang

AU - Yang, Jichan

AU - Zhang, Xinjun

PY - 2017/10/23

Y1 - 2017/10/23

N2 - Injection of waves in the ion cyclotron range of frequencies (ICRF) into a tokamak can potentially raise the plasma potential via RF rectification. Probes are affected both by changes in plasma potential and also by RF-averaging of the probe characteristic, with the latter tending to drop the floating potential. We present the effect of ICRF heating on divertor Langmuir probes in the EAST experiment. Over a scan of the outer gap, probes connected to the antennas have increases in floating potential with ICRF, but probes in between the outer-vessel strike point and flux surface tangent to the antenna have decreased floating potential. This behaviour is investigated using field-line mapping. Preliminary results show that mdiplane gas puffing can suppress the strong influence of ICRF on the probes' floating potential.

AB - Injection of waves in the ion cyclotron range of frequencies (ICRF) into a tokamak can potentially raise the plasma potential via RF rectification. Probes are affected both by changes in plasma potential and also by RF-averaging of the probe characteristic, with the latter tending to drop the floating potential. We present the effect of ICRF heating on divertor Langmuir probes in the EAST experiment. Over a scan of the outer gap, probes connected to the antennas have increases in floating potential with ICRF, but probes in between the outer-vessel strike point and flux surface tangent to the antenna have decreased floating potential. This behaviour is investigated using field-line mapping. Preliminary results show that mdiplane gas puffing can suppress the strong influence of ICRF on the probes' floating potential.

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U2 - 10.1051/epjconf/201715703039

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M3 - Conference article

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SN - 2101-6275

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JO - EPJ Web of Conferences

JF - EPJ Web of Conferences

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T2 - 22nd Topical Conference on Radio-Frequency Power in Plasmas 2017

Y2 - 30 May 2017 through 2 June 2017

ER -

ICRF-Induced Changes in Floating Potential and Ion Saturation Current in the EAST Divertor

Abstract

All Science Journal Classification (ASJC) codes

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