The effect of thermo-oxidation on plasma performance and in-vessel components in DIII-D

J. W. Davis; S. L. Allen; B. W.N. Fitzpatrick; N. H. Brooks; C. P. Chrobak; R. Ellis; A. A. Haasz; G. L. Jackson; A. Leonard; A. G. McLean; D. L. Rudakov; P. C. Stangeby; P. L. Taylor; C. K. Tsui; K. Umstadter; E. A. Unterberg; W. R. Wampler

doi:10.1088/0029-5515/53/7/073008

The effect of thermo-oxidation on plasma performance and in-vessel components in DIII-D

J. W. Davis, S. L. Allen, B. W.N. Fitzpatrick, N. H. Brooks, C. P. Chrobak, R. Ellis, A. A. Haasz, G. L. Jackson, A. Leonard, A. G. McLean, D. L. Rudakov, P. C. Stangeby, P. L. Taylor, C. K. Tsui, K. Umstadter, E. A. Unterberg, W. R. Wampler

Power Exhaust and Particle Control

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Abstract

In April 2010, two thermo-oxidation experiments ('O-bakes') were performed in the DIII-D tokamak. Internal surfaces of the tokamak, as well as a number of specimens inserted into the torus, were exposed to a mixture of 20% O ₂/80% He at a nominal pressure of 9.5 Torr (1.27 kPa) at a temperature of 350-360°C for a duration of 2 h. Three primary conclusions have been drawn from these experiments: (1) laboratory measurements on the release of deuterium from tokamak codeposits by oxidation have been duplicated in a tokamak environment, (2) no internal tokamak components or systems were adversely affected by the oxidation and (3) the recovery of plasma performance following oxidation was similar to that following regular torus openings.

Original language	English
Article number	073008
Journal	Nuclear Fusion
Volume	53
Issue number	7
DOIs	https://doi.org/10.1088/0029-5515/53/7/073008
State	Published - Jul 2013

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Davis, J. W., Allen, S. L., Fitzpatrick, B. W. N., Brooks, N. H., Chrobak, C. P., Ellis, R., Haasz, A. A., Jackson, G. L., Leonard, A., McLean, A. G., Rudakov, D. L., Stangeby, P. C., Taylor, P. L., Tsui, C. K., Umstadter, K., Unterberg, E. A., & Wampler, W. R. (2013). The effect of thermo-oxidation on plasma performance and in-vessel components in DIII-D. Nuclear Fusion, 53(7), Article 073008. https://doi.org/10.1088/0029-5515/53/7/073008

@article{dedc76e2f8f1415aa3f555035047667e,

title = "The effect of thermo-oxidation on plasma performance and in-vessel components in DIII-D",

abstract = "In April 2010, two thermo-oxidation experiments ('O-bakes') were performed in the DIII-D tokamak. Internal surfaces of the tokamak, as well as a number of specimens inserted into the torus, were exposed to a mixture of 20% O 2/80% He at a nominal pressure of 9.5 Torr (1.27 kPa) at a temperature of 350-360°C for a duration of 2 h. Three primary conclusions have been drawn from these experiments: (1) laboratory measurements on the release of deuterium from tokamak codeposits by oxidation have been duplicated in a tokamak environment, (2) no internal tokamak components or systems were adversely affected by the oxidation and (3) the recovery of plasma performance following oxidation was similar to that following regular torus openings.",

author = "Davis, {J. W.} and Allen, {S. L.} and Fitzpatrick, {B. W.N.} and Brooks, {N. H.} and Chrobak, {C. P.} and R. Ellis and Haasz, {A. A.} and Jackson, {G. L.} and A. Leonard and McLean, {A. G.} and Rudakov, {D. L.} and Stangeby, {P. C.} and Taylor, {P. L.} and Tsui, {C. K.} and K. Umstadter and Unterberg, {E. A.} and Wampler, {W. R.}",

year = "2013",

month = jul,

doi = "10.1088/0029-5515/53/7/073008",

language = "English",

volume = "53",

journal = "Nuclear Fusion",

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Davis, JW, Allen, SL, Fitzpatrick, BWN, Brooks, NH, Chrobak, CP, Ellis, R, Haasz, AA, Jackson, GL, Leonard, A, McLean, AG, Rudakov, DL, Stangeby, PC, Taylor, PL, Tsui, CK, Umstadter, K, Unterberg, EA & Wampler, WR 2013, 'The effect of thermo-oxidation on plasma performance and in-vessel components in DIII-D', Nuclear Fusion, vol. 53, no. 7, 073008. https://doi.org/10.1088/0029-5515/53/7/073008

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T1 - The effect of thermo-oxidation on plasma performance and in-vessel components in DIII-D

AU - Davis, J. W.

AU - Allen, S. L.

AU - Fitzpatrick, B. W.N.

AU - Brooks, N. H.

AU - Chrobak, C. P.

AU - Ellis, R.

AU - Haasz, A. A.

AU - Jackson, G. L.

AU - Leonard, A.

AU - McLean, A. G.

AU - Rudakov, D. L.

AU - Stangeby, P. C.

AU - Taylor, P. L.

AU - Tsui, C. K.

AU - Umstadter, K.

AU - Unterberg, E. A.

AU - Wampler, W. R.

PY - 2013/7

Y1 - 2013/7

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AB - In April 2010, two thermo-oxidation experiments ('O-bakes') were performed in the DIII-D tokamak. Internal surfaces of the tokamak, as well as a number of specimens inserted into the torus, were exposed to a mixture of 20% O 2/80% He at a nominal pressure of 9.5 Torr (1.27 kPa) at a temperature of 350-360°C for a duration of 2 h. Three primary conclusions have been drawn from these experiments: (1) laboratory measurements on the release of deuterium from tokamak codeposits by oxidation have been duplicated in a tokamak environment, (2) no internal tokamak components or systems were adversely affected by the oxidation and (3) the recovery of plasma performance following oxidation was similar to that following regular torus openings.

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JO - Nuclear Fusion

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The effect of thermo-oxidation on plasma performance and in-vessel components in DIII-D

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