RF sheath-enhanced beryllium sources at JET's ICRH antennas

C. C. Klepper; P. Jacquet; V. Bobkov; L. Colas; T. M. Biewer; D. Borodin; A. Czarnecka; C. Giroud; E. Lerche; V. Martin; M. L. Mayoral; F. Rimini; G. Sergienko; D. Van Eester

doi:10.1016/j.jnucmat.2013.01.124

RF sheath-enhanced beryllium sources at JET's ICRH antennas

C. C. Klepper, P. Jacquet, V. Bobkov, L. Colas, T. M. Biewer, D. Borodin, A. Czarnecka, C. Giroud, E. Lerche, V. Martin, M. L. Mayoral, F. Rimini, G. Sergienko, D. Van Eester

Diagnostics and Control

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

29 Scopus citations

Abstract

Local beryllium (Be) I and Be II line intensities were measured in the plasma-wall interaction region near an ICRH antenna in JET. The intent was to use these intensities as a measure of the formation of local Radio Frequency (RF) sheath potentials, through RF sheath rectification and potential build up at the end of field lines passing in front of the antenna. Experimentally, it was found that the Be I and Be II emission increase when using the antenna local to the spectroscopic measurement, and increase even more when using a remote antenna that is magnetically connected to the observation point. Magnetic field mapping indicates a magnetic connection between the observation location and the top corner region of the remote antenna and/or its protection limiter. These measurements can be used in support of RF sheath modeling that is an important part of the optimization of antenna design for next generation fusion energy devices, including ITER.

Original language	English
Pages (from-to)	S594-S598
Journal	Journal of Nuclear Materials
Volume	438
Issue number	SUPPL
DOIs	https://doi.org/10.1016/j.jnucmat.2013.01.124
State	Published - 2013

Funding

This work was supported by the US DOE under Contract No. DE-AC05-00OR22725 with UT-Battelle, LLC. This work was also supported by EURATOM and carried out within the framework of the European Fusion Development Agreement. The views and opinions expressed herein do not necessarily reflect those of the European Commission.

Funders	Funder number
U.S. Department of Energy
H2020 Euratom
Engineering and Physical Sciences Research Council	EP/I501045/1

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10.1016/j.jnucmat.2013.01.124

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title = "RF sheath-enhanced beryllium sources at JET's ICRH antennas",

abstract = "Local beryllium (Be) I and Be II line intensities were measured in the plasma-wall interaction region near an ICRH antenna in JET. The intent was to use these intensities as a measure of the formation of local Radio Frequency (RF) sheath potentials, through RF sheath rectification and potential build up at the end of field lines passing in front of the antenna. Experimentally, it was found that the Be I and Be II emission increase when using the antenna local to the spectroscopic measurement, and increase even more when using a remote antenna that is magnetically connected to the observation point. Magnetic field mapping indicates a magnetic connection between the observation location and the top corner region of the remote antenna and/or its protection limiter. These measurements can be used in support of RF sheath modeling that is an important part of the optimization of antenna design for next generation fusion energy devices, including ITER.",

author = "Klepper, {C. C.} and P. Jacquet and V. Bobkov and L. Colas and Biewer, {T. M.} and D. Borodin and A. Czarnecka and C. Giroud and E. Lerche and V. Martin and Mayoral, {M. L.} and F. Rimini and G. Sergienko and {Van Eester}, D.",

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doi = "10.1016/j.jnucmat.2013.01.124",

language = "English",

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T1 - RF sheath-enhanced beryllium sources at JET's ICRH antennas

AU - Klepper, C. C.

AU - Jacquet, P.

AU - Bobkov, V.

AU - Colas, L.

AU - Biewer, T. M.

AU - Borodin, D.

AU - Czarnecka, A.

AU - Giroud, C.

AU - Lerche, E.

AU - Martin, V.

AU - Mayoral, M. L.

AU - Rimini, F.

AU - Sergienko, G.

AU - Van Eester, D.

PY - 2013

Y1 - 2013

N2 - Local beryllium (Be) I and Be II line intensities were measured in the plasma-wall interaction region near an ICRH antenna in JET. The intent was to use these intensities as a measure of the formation of local Radio Frequency (RF) sheath potentials, through RF sheath rectification and potential build up at the end of field lines passing in front of the antenna. Experimentally, it was found that the Be I and Be II emission increase when using the antenna local to the spectroscopic measurement, and increase even more when using a remote antenna that is magnetically connected to the observation point. Magnetic field mapping indicates a magnetic connection between the observation location and the top corner region of the remote antenna and/or its protection limiter. These measurements can be used in support of RF sheath modeling that is an important part of the optimization of antenna design for next generation fusion energy devices, including ITER.

AB - Local beryllium (Be) I and Be II line intensities were measured in the plasma-wall interaction region near an ICRH antenna in JET. The intent was to use these intensities as a measure of the formation of local Radio Frequency (RF) sheath potentials, through RF sheath rectification and potential build up at the end of field lines passing in front of the antenna. Experimentally, it was found that the Be I and Be II emission increase when using the antenna local to the spectroscopic measurement, and increase even more when using a remote antenna that is magnetically connected to the observation point. Magnetic field mapping indicates a magnetic connection between the observation location and the top corner region of the remote antenna and/or its protection limiter. These measurements can be used in support of RF sheath modeling that is an important part of the optimization of antenna design for next generation fusion energy devices, including ITER.

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JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

IS - SUPPL

ER -

RF sheath-enhanced beryllium sources at JET's ICRH antennas

Abstract

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UN SDGs

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