Ion cyclotron wall conditioning in reactive gases on TEXTOR

G. Sergienko; A. Lyssoivan; V. Philipps; A. Kreter; C. Schulz; A. Huber; H. G. Esser; J. S. Hu; M. Freisinger; H. Reimer; U. Samm

doi:10.1016/j.jnucmat.2009.01.252

Ion cyclotron wall conditioning in reactive gases on TEXTOR

G. Sergienko, A. Lyssoivan, V. Philipps, A. Kreter, C. Schulz, A. Huber, H. G. Esser, J. S. Hu, M. Freisinger, H. Reimer, U. Samm

Laboratory for Plasma Physics

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

Abstract

The influence of working gas on the performance of Ion Cyclotron Wall Conditioning (ICWC) has been studied in the TEXTOR tokamak. Several reactive gases (H₂, D₂, O₂, N₂, NH₃) and their mixtures with He were tried and primary results about their efficiency to clean the wall from impurities and to release the retained fuel have been obtained. The experiments have demonstrated in general that low temperature plasmas produced in these gas mixtures by a conventional ion cyclotron heating system are suitable for wall cleaning. For comparison of the cleaning efficiency of different gas mixtures (except O₂), the TEXTOR wall was pre-loaded with Ar and D in a glow discharge. The release of Ar atoms due to ICWC has shown a sequential reduction in series of ICWC plasma pulses. This reduction was used as a criterion for the cleaning efficiency. For the fist time ammonia has been tested for the wall conditioning in a tokamak and demonstrated Ar and D cleaning efficiencies similar to the He/H₂ mixtures.

Original language	English
Pages (from-to)	979-982
Number of pages	4
Journal	Journal of Nuclear Materials
Volume	390-391
Issue number	1
DOIs	https://doi.org/10.1016/j.jnucmat.2009.01.252
Publication status	Published - 15 Jun 2009

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title = "Ion cyclotron wall conditioning in reactive gases on TEXTOR",

abstract = "The influence of working gas on the performance of Ion Cyclotron Wall Conditioning (ICWC) has been studied in the TEXTOR tokamak. Several reactive gases (H2, D2, O2, N2, NH3) and their mixtures with He were tried and primary results about their efficiency to clean the wall from impurities and to release the retained fuel have been obtained. The experiments have demonstrated in general that low temperature plasmas produced in these gas mixtures by a conventional ion cyclotron heating system are suitable for wall cleaning. For comparison of the cleaning efficiency of different gas mixtures (except O2), the TEXTOR wall was pre-loaded with Ar and D in a glow discharge. The release of Ar atoms due to ICWC has shown a sequential reduction in series of ICWC plasma pulses. This reduction was used as a criterion for the cleaning efficiency. For the fist time ammonia has been tested for the wall conditioning in a tokamak and demonstrated Ar and D cleaning efficiencies similar to the He/H2 mixtures.",

author = "G. Sergienko and A. Lyssoivan and V. Philipps and A. Kreter and C. Schulz and A. Huber and Esser, \{H. G.\} and Hu, \{J. S.\} and M. Freisinger and H. Reimer and U. Samm",

year = "2009",

month = jun,

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doi = "10.1016/j.jnucmat.2009.01.252",

language = "English",

volume = "390-391",

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journal = "Journal of Nuclear Materials",

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T1 - Ion cyclotron wall conditioning in reactive gases on TEXTOR

AU - Sergienko, G.

AU - Lyssoivan, A.

AU - Philipps, V.

AU - Kreter, A.

AU - Schulz, C.

AU - Huber, A.

AU - Esser, H. G.

AU - Hu, J. S.

AU - Freisinger, M.

AU - Reimer, H.

AU - Samm, U.

PY - 2009/6/15

Y1 - 2009/6/15

N2 - The influence of working gas on the performance of Ion Cyclotron Wall Conditioning (ICWC) has been studied in the TEXTOR tokamak. Several reactive gases (H2, D2, O2, N2, NH3) and their mixtures with He were tried and primary results about their efficiency to clean the wall from impurities and to release the retained fuel have been obtained. The experiments have demonstrated in general that low temperature plasmas produced in these gas mixtures by a conventional ion cyclotron heating system are suitable for wall cleaning. For comparison of the cleaning efficiency of different gas mixtures (except O2), the TEXTOR wall was pre-loaded with Ar and D in a glow discharge. The release of Ar atoms due to ICWC has shown a sequential reduction in series of ICWC plasma pulses. This reduction was used as a criterion for the cleaning efficiency. For the fist time ammonia has been tested for the wall conditioning in a tokamak and demonstrated Ar and D cleaning efficiencies similar to the He/H2 mixtures.

AB - The influence of working gas on the performance of Ion Cyclotron Wall Conditioning (ICWC) has been studied in the TEXTOR tokamak. Several reactive gases (H2, D2, O2, N2, NH3) and their mixtures with He were tried and primary results about their efficiency to clean the wall from impurities and to release the retained fuel have been obtained. The experiments have demonstrated in general that low temperature plasmas produced in these gas mixtures by a conventional ion cyclotron heating system are suitable for wall cleaning. For comparison of the cleaning efficiency of different gas mixtures (except O2), the TEXTOR wall was pre-loaded with Ar and D in a glow discharge. The release of Ar atoms due to ICWC has shown a sequential reduction in series of ICWC plasma pulses. This reduction was used as a criterion for the cleaning efficiency. For the fist time ammonia has been tested for the wall conditioning in a tokamak and demonstrated Ar and D cleaning efficiencies similar to the He/H2 mixtures.

UR - https://www.scopus.com/pages/publications/67349199182

U2 - 10.1016/j.jnucmat.2009.01.252

DO - 10.1016/j.jnucmat.2009.01.252

M3 - Article

AN - SCOPUS:67349199182

SN - 0022-3115

VL - 390-391

SP - 979

EP - 982

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

IS - 1

ER -

Ion cyclotron wall conditioning in reactive gases on TEXTOR

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