Making ICRF power compatible with a high-Z wall in ASDEX Upgrade

V. Bobkov; D. Aguiam; R. Bilato; S. Brezinsek; L. Colas; H. Faugel; H. Fünfgelder; A. Herrmann; J. Jacquot; A. Kallenbach; D. Milanesio; R. Maggiora; R. Neu; J. M. Noterdaeme; R. Ochoukov; S. Potzel; T. Pütterich; A. Silva; W. Tierens; A. Tuccilo; O. Tudisco; Y. Wang; Q. Yang; W. Zhang

doi:10.1088/0741-3335/59/1/014022

Making ICRF power compatible with a high-Z wall in ASDEX Upgrade

V. Bobkov, D. Aguiam, R. Bilato, S. Brezinsek, L. Colas, H. Faugel, H. Fünfgelder, A. Herrmann, J. Jacquot, A. Kallenbach, D. Milanesio, R. Maggiora, R. Neu, J. M. Noterdaeme, R. Ochoukov, S. Potzel, T. Pütterich, A. Silva, W. Tierens, A. TucciloO. Tudisco, Y. Wang, Q. Yang, W. Zhang

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

62 Scopus citations

Abstract

A comparison of the ASDEX Upgrade 3-strap ICRF antenna data with the linear electro-magnetic TOPICA calculations is presented. The comparison substantiates a reduction of the local electric field at the radially protruding plasma-facing elements of the antenna as a relevant approach for minimizing tungsten (W) sputtering in conditions when the slow wave is strongly evanescent. The measured reaction of the time-averaged RF current at the antenna limiters to the antenna feeding variations is less sensitive than predicted by the calculations. This is likely to have been caused by temporal and spatial fluctuations in the 3D plasma density distribution affected by local non-linear interactions. The 3-strap antenna with the W-coated limiters produces drastically less W sputtering compared to the W-coated 2-strap antennas. This is consistent with the non-linear asymptotic SSWICH-SW calculations for RF sheaths.

Original language	English
Article number	014022
Journal	Plasma Physics and Controlled Fusion
Volume	59
Issue number	1
DOIs	https://doi.org/10.1088/0741-3335/59/1/014022
State	Published - Jan 2017
Externally published	Yes

Funding

This work has been carried out within the framework of the EUROfusion Consortium and has received funding from the EURATOM research and training programme 20142018 under grant agreement No. 633053. The views and opinions expressed herein do not necessarily reflect those of the European Commission.

Funders	Funder number
EURATOM research and training programme 20142018
Horizon 2020 Framework Programme	633053
European Commission

Keywords

ASDEX Upgrade
ICRF
RF sheath
SSWICH
TOPICA
W sputtering
antenna

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1088/0741-3335/59/1/014022

Cite this

Bobkov, V., Aguiam, D., Bilato, R., Brezinsek, S., Colas, L., Faugel, H., Fünfgelder, H., Herrmann, A., Jacquot, J., Kallenbach, A., Milanesio, D., Maggiora, R., Neu, R., Noterdaeme, J. M., Ochoukov, R., Potzel, S., Pütterich, T., Silva, A., Tierens, W., ... Zhang, W. (2017). Making ICRF power compatible with a high-Z wall in ASDEX Upgrade. Plasma Physics and Controlled Fusion, 59(1), Article 014022. https://doi.org/10.1088/0741-3335/59/1/014022

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title = "Making ICRF power compatible with a high-Z wall in ASDEX Upgrade",

abstract = "A comparison of the ASDEX Upgrade 3-strap ICRF antenna data with the linear electro-magnetic TOPICA calculations is presented. The comparison substantiates a reduction of the local electric field at the radially protruding plasma-facing elements of the antenna as a relevant approach for minimizing tungsten (W) sputtering in conditions when the slow wave is strongly evanescent. The measured reaction of the time-averaged RF current at the antenna limiters to the antenna feeding variations is less sensitive than predicted by the calculations. This is likely to have been caused by temporal and spatial fluctuations in the 3D plasma density distribution affected by local non-linear interactions. The 3-strap antenna with the W-coated limiters produces drastically less W sputtering compared to the W-coated 2-strap antennas. This is consistent with the non-linear asymptotic SSWICH-SW calculations for RF sheaths.",

keywords = "ASDEX Upgrade, ICRF, RF sheath, SSWICH, TOPICA, W sputtering, antenna",

author = "V. Bobkov and D. Aguiam and R. Bilato and S. Brezinsek and L. Colas and H. Faugel and H. F{\"u}nfgelder and A. Herrmann and J. Jacquot and A. Kallenbach and D. Milanesio and R. Maggiora and R. Neu and Noterdaeme, {J. M.} and R. Ochoukov and S. Potzel and T. P{\"u}tterich and A. Silva and W. Tierens and A. Tuccilo and O. Tudisco and Y. Wang and Q. Yang and W. Zhang",

note = "Publisher Copyright: {\textcopyright} 2017 IOP Publishing Ltd.",

year = "2017",

month = jan,

doi = "10.1088/0741-3335/59/1/014022",

language = "English",

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Bobkov, V, Aguiam, D, Bilato, R, Brezinsek, S, Colas, L, Faugel, H, Fünfgelder, H, Herrmann, A, Jacquot, J, Kallenbach, A, Milanesio, D, Maggiora, R, Neu, R, Noterdaeme, JM, Ochoukov, R, Potzel, S, Pütterich, T, Silva, A, Tierens, W, Tuccilo, A, Tudisco, O, Wang, Y, Yang, Q & Zhang, W 2017, 'Making ICRF power compatible with a high-Z wall in ASDEX Upgrade', Plasma Physics and Controlled Fusion, vol. 59, no. 1, 014022. https://doi.org/10.1088/0741-3335/59/1/014022

TY - JOUR

T1 - Making ICRF power compatible with a high-Z wall in ASDEX Upgrade

AU - Bobkov, V.

AU - Aguiam, D.

AU - Bilato, R.

AU - Brezinsek, S.

AU - Colas, L.

AU - Faugel, H.

AU - Fünfgelder, H.

AU - Herrmann, A.

AU - Jacquot, J.

AU - Kallenbach, A.

AU - Milanesio, D.

AU - Maggiora, R.

AU - Neu, R.

AU - Noterdaeme, J. M.

AU - Ochoukov, R.

AU - Potzel, S.

AU - Pütterich, T.

AU - Silva, A.

AU - Tierens, W.

AU - Tuccilo, A.

AU - Tudisco, O.

AU - Wang, Y.

AU - Yang, Q.

AU - Zhang, W.

PY - 2017/1

Y1 - 2017/1

N2 - A comparison of the ASDEX Upgrade 3-strap ICRF antenna data with the linear electro-magnetic TOPICA calculations is presented. The comparison substantiates a reduction of the local electric field at the radially protruding plasma-facing elements of the antenna as a relevant approach for minimizing tungsten (W) sputtering in conditions when the slow wave is strongly evanescent. The measured reaction of the time-averaged RF current at the antenna limiters to the antenna feeding variations is less sensitive than predicted by the calculations. This is likely to have been caused by temporal and spatial fluctuations in the 3D plasma density distribution affected by local non-linear interactions. The 3-strap antenna with the W-coated limiters produces drastically less W sputtering compared to the W-coated 2-strap antennas. This is consistent with the non-linear asymptotic SSWICH-SW calculations for RF sheaths.

AB - A comparison of the ASDEX Upgrade 3-strap ICRF antenna data with the linear electro-magnetic TOPICA calculations is presented. The comparison substantiates a reduction of the local electric field at the radially protruding plasma-facing elements of the antenna as a relevant approach for minimizing tungsten (W) sputtering in conditions when the slow wave is strongly evanescent. The measured reaction of the time-averaged RF current at the antenna limiters to the antenna feeding variations is less sensitive than predicted by the calculations. This is likely to have been caused by temporal and spatial fluctuations in the 3D plasma density distribution affected by local non-linear interactions. The 3-strap antenna with the W-coated limiters produces drastically less W sputtering compared to the W-coated 2-strap antennas. This is consistent with the non-linear asymptotic SSWICH-SW calculations for RF sheaths.

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KW - ICRF

KW - RF sheath

KW - SSWICH

KW - TOPICA

KW - W sputtering

KW - antenna

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U2 - 10.1088/0741-3335/59/1/014022

DO - 10.1088/0741-3335/59/1/014022

M3 - Article

AN - SCOPUS:85005966821

SN - 0741-3335

VL - 59

JO - Plasma Physics and Controlled Fusion

JF - Plasma Physics and Controlled Fusion

IS - 1

M1 - 014022

ER -

Making ICRF power compatible with a high-Z wall in ASDEX Upgrade

Abstract

Funding

Keywords

UN SDGs

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