Progress in controlling ICRF-edge interactions in ASDEX upgrade

Vl Bobkov; Ph Jacquet; R. Ochoukov; W. Zhang; R. Bilato; F. Braun; D. Carralero; L. Colas; R. Dux; H. Faugel; H. Fünfgelder; J. Jacquot; A. Křivská; T. Lunt; D. Milanesio; R. Maggiora; O. Meyer; J. M. Noterdaeme; S. Potzel; Th Pütterich; I. Stepanov

doi:10.1063/1.4936469

Progress in controlling ICRF-edge interactions in ASDEX upgrade

Vl Bobkov, Ph Jacquet, R. Ochoukov, W. Zhang, R. Bilato, F. Braun, D. Carralero, L. Colas, R. Dux, H. Faugel, H. Fünfgelder, J. Jacquot, A. Křivská, T. Lunt, D. Milanesio, R. Maggiora, O. Meyer, J. M. Noterdaeme, S. Potzel, Th PütterichI. Stepanov

Laboratory for Plasma Physics

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

Abstract

RF measurements during variation of the strap voltage balance of the original 2-strap ICRF antenna in ASDEX Upgrade at constant power are consistent with electromagnetic calculations by HFSS and TOPICA, more so for the latter. RF image current compensation is observed at the antenna limiters in the experiment at a local strap voltage of about half of the value of the remote strap, albeit with a non-negligible uncertainty in phasing. The RF-specific tungsten (W) source at the broad-limiter 2-strap antenna correlates strongly with the RF voltage at the local strap at the locations not connected to opposite side of the antenna along magnetic field lines. The trends of the observed increase of the RF loading with injection of local gas are well described by a combined EMC3-Eirene - FELICE calculations, with the most efficient improvement confirmed for the outer-midplane valves, but underestimated by about 1/3. The corresponding deuterium density tailoring is also likely responsible for the decrease of local W sources observed in the experiment.

Original language	English
Title of host publication	Radio Frequency Power in Plasmas
Subtitle of host publication	Proceedings of the 21St Topical Conference
Editors	Robert I. Pinsker
Publisher	American Institute of Physics Inc.
ISBN (Electronic)	9780735413368
DOIs	https://doi.org/10.1063/1.4936469
Publication status	Published - 10 Dec 2015
Event	21st Topical Conference on Radiofrequency Power in Plasmas - Lake Arrowhead, United States Duration: 27 Apr 2015 → 29 Apr 2015

Publication series

Name	AIP Conference Proceedings
Volume	1689
ISSN (Print)	0094-243X
ISSN (Electronic)	1551-7616

Conference

Conference	21st Topical Conference on Radiofrequency Power in Plasmas
Country/Territory	United States
City	Lake Arrowhead
Period	27/04/15 → 29/04/15

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10.1063/1.4936469

Cite this

Bobkov, V., Jacquet, P., Ochoukov, R., Zhang, W., Bilato, R., Braun, F., Carralero, D., Colas, L., Dux, R., Faugel, H., Fünfgelder, H., Jacquot, J., Křivská, A., Lunt, T., Milanesio, D., Maggiora, R., Meyer, O., Noterdaeme, J. M., Potzel, S., ... Stepanov, I. (2015). Progress in controlling ICRF-edge interactions in ASDEX upgrade. In R. I. Pinsker (Ed.), Radio Frequency Power in Plasmas: Proceedings of the 21St Topical Conference Article 030004 (AIP Conference Proceedings; Vol. 1689). American Institute of Physics Inc.. https://doi.org/10.1063/1.4936469

@inproceedings{b4ce8bace8544769b2ed9e4bbdced9aa,

title = "Progress in controlling ICRF-edge interactions in ASDEX upgrade",

abstract = "RF measurements during variation of the strap voltage balance of the original 2-strap ICRF antenna in ASDEX Upgrade at constant power are consistent with electromagnetic calculations by HFSS and TOPICA, more so for the latter. RF image current compensation is observed at the antenna limiters in the experiment at a local strap voltage of about half of the value of the remote strap, albeit with a non-negligible uncertainty in phasing. The RF-specific tungsten (W) source at the broad-limiter 2-strap antenna correlates strongly with the RF voltage at the local strap at the locations not connected to opposite side of the antenna along magnetic field lines. The trends of the observed increase of the RF loading with injection of local gas are well described by a combined EMC3-Eirene - FELICE calculations, with the most efficient improvement confirmed for the outer-midplane valves, but underestimated by about 1/3. The corresponding deuterium density tailoring is also likely responsible for the decrease of local W sources observed in the experiment.",

author = "Vl Bobkov and Ph Jacquet and R. Ochoukov and W. Zhang and R. Bilato and F. Braun and D. Carralero and L. Colas and R. Dux and H. Faugel and H. F{\"u}nfgelder and J. Jacquot and A. K{\v r}ivsk{\'a} and T. Lunt and D. Milanesio and R. Maggiora and O. Meyer and Noterdaeme, {J. M.} and S. Potzel and Th P{\"u}tterich and I. Stepanov",

note = "Funding Information: This work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training programme 2014-2018 under grant agreement No 633053. The views and opinions expressed herein do not necessarily reflect those of the European Commission.; 21st Topical Conference on Radiofrequency Power in Plasmas ; Conference date: 27-04-2015 Through 29-04-2015",

year = "2015",

month = dec,

day = "10",

doi = "10.1063/1.4936469",

language = "English",

series = "AIP Conference Proceedings",

publisher = "American Institute of Physics Inc.",

editor = "Pinsker, {Robert I.}",

booktitle = "Radio Frequency Power in Plasmas",

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Bobkov, V, Jacquet, P, Ochoukov, R, Zhang, W, Bilato, R, Braun, F, Carralero, D, Colas, L, Dux, R, Faugel, H, Fünfgelder, H, Jacquot, J, Křivská, A, Lunt, T, Milanesio, D, Maggiora, R, Meyer, O, Noterdaeme, JM, Potzel, S, Pütterich, T & Stepanov, I 2015, Progress in controlling ICRF-edge interactions in ASDEX upgrade. in RI Pinsker (ed.), Radio Frequency Power in Plasmas: Proceedings of the 21St Topical Conference., 030004, AIP Conference Proceedings, vol. 1689, American Institute of Physics Inc., 21st Topical Conference on Radiofrequency Power in Plasmas, Lake Arrowhead, United States, 27/04/15. https://doi.org/10.1063/1.4936469

Progress in controlling ICRF-edge interactions in ASDEX upgrade. / Bobkov, Vl; Jacquet, Ph; Ochoukov, R. et al.
Radio Frequency Power in Plasmas: Proceedings of the 21St Topical Conference. ed. / Robert I. Pinsker. American Institute of Physics Inc., 2015. 030004 (AIP Conference Proceedings; Vol. 1689).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

TY - GEN

T1 - Progress in controlling ICRF-edge interactions in ASDEX upgrade

AU - Bobkov, Vl

AU - Jacquet, Ph

AU - Ochoukov, R.

AU - Zhang, W.

AU - Bilato, R.

AU - Braun, F.

AU - Carralero, D.

AU - Colas, L.

AU - Dux, R.

AU - Faugel, H.

AU - Fünfgelder, H.

AU - Jacquot, J.

AU - Křivská, A.

AU - Lunt, T.

AU - Milanesio, D.

AU - Maggiora, R.

AU - Meyer, O.

AU - Noterdaeme, J. M.

AU - Potzel, S.

AU - Pütterich, Th

AU - Stepanov, I.

N1 - Funding Information: This work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training programme 2014-2018 under grant agreement No 633053. The views and opinions expressed herein do not necessarily reflect those of the European Commission.

PY - 2015/12/10

Y1 - 2015/12/10

N2 - RF measurements during variation of the strap voltage balance of the original 2-strap ICRF antenna in ASDEX Upgrade at constant power are consistent with electromagnetic calculations by HFSS and TOPICA, more so for the latter. RF image current compensation is observed at the antenna limiters in the experiment at a local strap voltage of about half of the value of the remote strap, albeit with a non-negligible uncertainty in phasing. The RF-specific tungsten (W) source at the broad-limiter 2-strap antenna correlates strongly with the RF voltage at the local strap at the locations not connected to opposite side of the antenna along magnetic field lines. The trends of the observed increase of the RF loading with injection of local gas are well described by a combined EMC3-Eirene - FELICE calculations, with the most efficient improvement confirmed for the outer-midplane valves, but underestimated by about 1/3. The corresponding deuterium density tailoring is also likely responsible for the decrease of local W sources observed in the experiment.

AB - RF measurements during variation of the strap voltage balance of the original 2-strap ICRF antenna in ASDEX Upgrade at constant power are consistent with electromagnetic calculations by HFSS and TOPICA, more so for the latter. RF image current compensation is observed at the antenna limiters in the experiment at a local strap voltage of about half of the value of the remote strap, albeit with a non-negligible uncertainty in phasing. The RF-specific tungsten (W) source at the broad-limiter 2-strap antenna correlates strongly with the RF voltage at the local strap at the locations not connected to opposite side of the antenna along magnetic field lines. The trends of the observed increase of the RF loading with injection of local gas are well described by a combined EMC3-Eirene - FELICE calculations, with the most efficient improvement confirmed for the outer-midplane valves, but underestimated by about 1/3. The corresponding deuterium density tailoring is also likely responsible for the decrease of local W sources observed in the experiment.

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U2 - 10.1063/1.4936469

DO - 10.1063/1.4936469

M3 - Conference contribution

AN - SCOPUS:84984540671

T3 - AIP Conference Proceedings

BT - Radio Frequency Power in Plasmas

A2 - Pinsker, Robert I.

PB - American Institute of Physics Inc.

T2 - 21st Topical Conference on Radiofrequency Power in Plasmas

Y2 - 27 April 2015 through 29 April 2015

ER -

Progress in controlling ICRF-edge interactions in ASDEX upgrade

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