New scenarios of ICRF wall conditioning in TEXTOR and ASDEX Upgrade

A. Lyssoivan; R. Koch; D. Van Eester; G. Van Wassenhove; M. Vervier; R. Weynants; M. Freisinger; A. Kreter; V. Philipps; H. Reimer; U. Samm; G. Sergienko; V. Bobkov; H. U. Fahrbach; D. Hartmann; A. Herrmann; J. M. Noterdaeme; V. Rohde; W. Suttrop; E. Gauthier; E. de la Cal

doi:10.1016/j.jnucmat.2007.01.186

New scenarios of ICRF wall conditioning in TEXTOR and ASDEX Upgrade

A. Lyssoivan, R. Koch, D. Van Eester, G. Van Wassenhove, M. Vervier, R. Weynants, M. Freisinger, A. Kreter, V. Philipps, H. Reimer, U. Samm, G. Sergienko, V. Bobkov, H. U. Fahrbach, D. Hartmann, A. Herrmann, J. M. Noterdaeme, V. Rohde, W. Suttrop, E. GauthierE. de la Cal

Laboratory for Plasma Physics

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

Abstract

Inter-machine studies of wall conditioning with the ICRF discharges have been performed in the limiter (TEXTOR) and divertor (ASDEX Upgrade (AUG)) tokamaks in the presence of a toroidal magnetic field (≥2 T) using the conventional ICRF antennas without modifications in hardware. The vessel oxidation treatment by pulsed ICRF discharges in (He + O₂)-mixture (TEXTOR) is analyzed in terms of ratios of the RF pulse length to the O₂-puff duration. A successive set of deuterium and helium ICRF discharges was developed for post-oxidation wall cleaning and analyzed in the light of TEXTOR recovery to the normal plasma operation. A new scenario of ICRF wall conditioning in (He + H₂)-mixture at two frequencies was applied in AUG and compared with the standard glow discharge in terms of outgassing efficiency. Modeling of the absorbed RF power was done to clear up a role of the H₂ concentration in the homogeneity of ICRF plasmas and the generation of high-energy ions.

Original language	English
Pages (from-to)	1358-1363
Number of pages	6
Journal	Journal of Nuclear Materials
Volume	363-365
Issue number	1-3
DOIs	https://doi.org/10.1016/j.jnucmat.2007.01.186
Publication status	Published - 15 Jun 2007

Keywords

ICRF antenna
ITER
RF discharge
Wall conditioning

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10.1016/j.jnucmat.2007.01.186

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Lyssoivan, A., Koch, R., Van Eester, D., Van Wassenhove, G., Vervier, M., Weynants, R., Freisinger, M., Kreter, A., Philipps, V., Reimer, H., Samm, U., Sergienko, G., Bobkov, V., Fahrbach, H. U., Hartmann, D., Herrmann, A., Noterdaeme, J. M., Rohde, V., Suttrop, W., ... de la Cal, E. (2007). New scenarios of ICRF wall conditioning in TEXTOR and ASDEX Upgrade. Journal of Nuclear Materials, 363-365(1-3), 1358-1363. https://doi.org/10.1016/j.jnucmat.2007.01.186

@article{847496793a2d47d68f6d12d276b5de51,

title = "New scenarios of ICRF wall conditioning in TEXTOR and ASDEX Upgrade",

abstract = "Inter-machine studies of wall conditioning with the ICRF discharges have been performed in the limiter (TEXTOR) and divertor (ASDEX Upgrade (AUG)) tokamaks in the presence of a toroidal magnetic field (≥2 T) using the conventional ICRF antennas without modifications in hardware. The vessel oxidation treatment by pulsed ICRF discharges in (He + O2)-mixture (TEXTOR) is analyzed in terms of ratios of the RF pulse length to the O2-puff duration. A successive set of deuterium and helium ICRF discharges was developed for post-oxidation wall cleaning and analyzed in the light of TEXTOR recovery to the normal plasma operation. A new scenario of ICRF wall conditioning in (He + H2)-mixture at two frequencies was applied in AUG and compared with the standard glow discharge in terms of outgassing efficiency. Modeling of the absorbed RF power was done to clear up a role of the H2 concentration in the homogeneity of ICRF plasmas and the generation of high-energy ions.",

keywords = "ICRF antenna, ITER, RF discharge, Wall conditioning",

author = "A. Lyssoivan and R. Koch and {Van Eester}, D. and {Van Wassenhove}, G. and M. Vervier and R. Weynants and M. Freisinger and A. Kreter and V. Philipps and H. Reimer and U. Samm and G. Sergienko and V. Bobkov and Fahrbach, {H. U.} and D. Hartmann and A. Herrmann and Noterdaeme, {J. M.} and V. Rohde and W. Suttrop and E. Gauthier and {de la Cal}, E.",

year = "2007",

month = jun,

day = "15",

doi = "10.1016/j.jnucmat.2007.01.186",

language = "English",

volume = "363-365",

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Lyssoivan, A, Koch, R, Van Eester, D, Van Wassenhove, G, Vervier, M, Weynants, R, Freisinger, M, Kreter, A, Philipps, V, Reimer, H, Samm, U, Sergienko, G, Bobkov, V, Fahrbach, HU, Hartmann, D, Herrmann, A, Noterdaeme, JM, Rohde, V, Suttrop, W, Gauthier, E & de la Cal, E 2007, 'New scenarios of ICRF wall conditioning in TEXTOR and ASDEX Upgrade', Journal of Nuclear Materials, vol. 363-365, no. 1-3, pp. 1358-1363. https://doi.org/10.1016/j.jnucmat.2007.01.186

TY - JOUR

T1 - New scenarios of ICRF wall conditioning in TEXTOR and ASDEX Upgrade

AU - Lyssoivan, A.

AU - Koch, R.

AU - Van Eester, D.

AU - Van Wassenhove, G.

AU - Vervier, M.

AU - Weynants, R.

AU - Freisinger, M.

AU - Kreter, A.

AU - Philipps, V.

AU - Reimer, H.

AU - Samm, U.

AU - Sergienko, G.

AU - Bobkov, V.

AU - Fahrbach, H. U.

AU - Hartmann, D.

AU - Herrmann, A.

AU - Noterdaeme, J. M.

AU - Rohde, V.

AU - Suttrop, W.

AU - Gauthier, E.

AU - de la Cal, E.

PY - 2007/6/15

Y1 - 2007/6/15

N2 - Inter-machine studies of wall conditioning with the ICRF discharges have been performed in the limiter (TEXTOR) and divertor (ASDEX Upgrade (AUG)) tokamaks in the presence of a toroidal magnetic field (≥2 T) using the conventional ICRF antennas without modifications in hardware. The vessel oxidation treatment by pulsed ICRF discharges in (He + O2)-mixture (TEXTOR) is analyzed in terms of ratios of the RF pulse length to the O2-puff duration. A successive set of deuterium and helium ICRF discharges was developed for post-oxidation wall cleaning and analyzed in the light of TEXTOR recovery to the normal plasma operation. A new scenario of ICRF wall conditioning in (He + H2)-mixture at two frequencies was applied in AUG and compared with the standard glow discharge in terms of outgassing efficiency. Modeling of the absorbed RF power was done to clear up a role of the H2 concentration in the homogeneity of ICRF plasmas and the generation of high-energy ions.

AB - Inter-machine studies of wall conditioning with the ICRF discharges have been performed in the limiter (TEXTOR) and divertor (ASDEX Upgrade (AUG)) tokamaks in the presence of a toroidal magnetic field (≥2 T) using the conventional ICRF antennas without modifications in hardware. The vessel oxidation treatment by pulsed ICRF discharges in (He + O2)-mixture (TEXTOR) is analyzed in terms of ratios of the RF pulse length to the O2-puff duration. A successive set of deuterium and helium ICRF discharges was developed for post-oxidation wall cleaning and analyzed in the light of TEXTOR recovery to the normal plasma operation. A new scenario of ICRF wall conditioning in (He + H2)-mixture at two frequencies was applied in AUG and compared with the standard glow discharge in terms of outgassing efficiency. Modeling of the absorbed RF power was done to clear up a role of the H2 concentration in the homogeneity of ICRF plasmas and the generation of high-energy ions.

KW - ICRF antenna

KW - ITER

KW - RF discharge

KW - Wall conditioning

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U2 - 10.1016/j.jnucmat.2007.01.186

DO - 10.1016/j.jnucmat.2007.01.186

M3 - Article

AN - SCOPUS:34249089848

SN - 0022-3115

VL - 363-365

SP - 1358

EP - 1363

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

IS - 1-3

ER -

New scenarios of ICRF wall conditioning in TEXTOR and ASDEX Upgrade

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Keywords

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