Control of high-Z PFC erosion by local gas injection in DIII-D

D. L. Rudakov; P. C. Stangeby; C. P.C. Wong; A. G. McLean; W. R. Wampler; J. G. Watkins; J. A. Boedo; A. Briesemeister; D. A. Buchenauer; C. P. Chrobak; J. D. Elder; M. E. Fenstermacher; H. Y. Guo; C. J. Lasnier; A. W. Leonard; R. Maingi; R. A. Moyer

doi:10.1016/j.jnucmat.2014.10.056

Control of high-Z PFC erosion by local gas injection in DIII-D

D. L. Rudakov
, P. C. Stangeby
, C. P.C. Wong
, A. G. McLean
, W. R. Wampler
, J. G. Watkins
, J. A. Boedo
, A. Briesemeister
, D. A. Buchenauer
, C. P. Chrobak
, J. D. Elder
, M. E. Fenstermacher
, H. Y. Guo
, C. J. Lasnier
, A. W. Leonard
, R. Maingi
, R. A. Moyer

PPPL Tokamak Expermntl Science

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

9 Scopus citations

Abstract

Abstract Reduced erosion of a high-Z PFC divertor surface was observed in DIII-D with local injection of methane and deuterium gases. Molybdenum-coated silicon samples were exposed in the lower divertor of DIII-D using DiMES under plasma conditions previously shown to cause significant net erosion of Mo. Three exposures with ¹³CH₄ and one exposure with D₂ gas injection about 12 cm upstream of the samples located within 1-2 cm of the attached strike point were performed. Reduction of Mo erosion was evidenced in-situ by the suppression of MoI line radiation at 386.4 nm once the gas injection started. Post-mortem ion beam analysis demonstrated that the net erosion of molybdenum near the center of the samples exposed with ¹³CH₄ injection was below the measurement resolution of 0.5 nm, corresponding to a rate of ≤0.04 nm/s. Compared to the previously measured erosion rates, this constitutes a reduction by a factor of >10.

Original language	English (US)
Article number	48553
Pages (from-to)	605-610
Number of pages	6
Journal	Journal of Nuclear Materials
Volume	463
DOIs	https://doi.org/10.1016/j.jnucmat.2014.10.056
State	Published - Jul 22 2015

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics
General Materials Science
Nuclear Energy and Engineering

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10.1016/j.jnucmat.2014.10.056

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Rudakov, D. L., Stangeby, P. C., Wong, C. P. C., McLean, A. G., Wampler, W. R., Watkins, J. G., Boedo, J. A., Briesemeister, A., Buchenauer, D. A., Chrobak, C. P., Elder, J. D., Fenstermacher, M. E., Guo, H. Y., Lasnier, C. J., Leonard, A. W., Maingi, R., & Moyer, R. A. (2015). Control of high-Z PFC erosion by local gas injection in DIII-D. Journal of Nuclear Materials, 463, 605-610. Article 48553. https://doi.org/10.1016/j.jnucmat.2014.10.056

@article{651e16497e8a407eb6f1832412c5a373,

title = "Control of high-Z PFC erosion by local gas injection in DIII-D",

abstract = "Abstract Reduced erosion of a high-Z PFC divertor surface was observed in DIII-D with local injection of methane and deuterium gases. Molybdenum-coated silicon samples were exposed in the lower divertor of DIII-D using DiMES under plasma conditions previously shown to cause significant net erosion of Mo. Three exposures with 13CH4 and one exposure with D2 gas injection about 12 cm upstream of the samples located within 1-2 cm of the attached strike point were performed. Reduction of Mo erosion was evidenced in-situ by the suppression of MoI line radiation at 386.4 nm once the gas injection started. Post-mortem ion beam analysis demonstrated that the net erosion of molybdenum near the center of the samples exposed with 13CH4 injection was below the measurement resolution of 0.5 nm, corresponding to a rate of ≤0.04 nm/s. Compared to the previously measured erosion rates, this constitutes a reduction by a factor of >10.",

author = "Rudakov, \{D. L.\} and Stangeby, \{P. C.\} and Wong, \{C. P.C.\} and McLean, \{A. G.\} and Wampler, \{W. R.\} and Watkins, \{J. G.\} and Boedo, \{J. A.\} and A. Briesemeister and Buchenauer, \{D. A.\} and Chrobak, \{C. P.\} and Elder, \{J. D.\} and Fenstermacher, \{M. E.\} and Guo, \{H. Y.\} and Lasnier, \{C. J.\} and Leonard, \{A. W.\} and R. Maingi and Moyer, \{R. A.\}",

note = "Publisher Copyright: {\textcopyright} 2014 Elsevier B.V.",

year = "2015",

month = jul,

day = "22",

doi = "10.1016/j.jnucmat.2014.10.056",

language = "English (US)",

volume = "463",

pages = "605--610",

journal = "Journal of Nuclear Materials",

issn = "0022-3115",

publisher = "Elsevier B.V.",

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Rudakov, DL, Stangeby, PC, Wong, CPC, McLean, AG, Wampler, WR, Watkins, JG, Boedo, JA, Briesemeister, A, Buchenauer, DA, Chrobak, CP, Elder, JD, Fenstermacher, ME, Guo, HY, Lasnier, CJ, Leonard, AW, Maingi, R & Moyer, RA 2015, 'Control of high-Z PFC erosion by local gas injection in DIII-D', Journal of Nuclear Materials, vol. 463, 48553, pp. 605-610. https://doi.org/10.1016/j.jnucmat.2014.10.056

TY - JOUR

T1 - Control of high-Z PFC erosion by local gas injection in DIII-D

AU - Rudakov, D. L.

AU - Stangeby, P. C.

AU - Wong, C. P.C.

AU - McLean, A. G.

AU - Wampler, W. R.

AU - Watkins, J. G.

AU - Boedo, J. A.

AU - Briesemeister, A.

AU - Buchenauer, D. A.

AU - Chrobak, C. P.

AU - Elder, J. D.

AU - Fenstermacher, M. E.

AU - Guo, H. Y.

AU - Lasnier, C. J.

AU - Leonard, A. W.

AU - Maingi, R.

AU - Moyer, R. A.

PY - 2015/7/22

Y1 - 2015/7/22

N2 - Abstract Reduced erosion of a high-Z PFC divertor surface was observed in DIII-D with local injection of methane and deuterium gases. Molybdenum-coated silicon samples were exposed in the lower divertor of DIII-D using DiMES under plasma conditions previously shown to cause significant net erosion of Mo. Three exposures with 13CH4 and one exposure with D2 gas injection about 12 cm upstream of the samples located within 1-2 cm of the attached strike point were performed. Reduction of Mo erosion was evidenced in-situ by the suppression of MoI line radiation at 386.4 nm once the gas injection started. Post-mortem ion beam analysis demonstrated that the net erosion of molybdenum near the center of the samples exposed with 13CH4 injection was below the measurement resolution of 0.5 nm, corresponding to a rate of ≤0.04 nm/s. Compared to the previously measured erosion rates, this constitutes a reduction by a factor of >10.

AB - Abstract Reduced erosion of a high-Z PFC divertor surface was observed in DIII-D with local injection of methane and deuterium gases. Molybdenum-coated silicon samples were exposed in the lower divertor of DIII-D using DiMES under plasma conditions previously shown to cause significant net erosion of Mo. Three exposures with 13CH4 and one exposure with D2 gas injection about 12 cm upstream of the samples located within 1-2 cm of the attached strike point were performed. Reduction of Mo erosion was evidenced in-situ by the suppression of MoI line radiation at 386.4 nm once the gas injection started. Post-mortem ion beam analysis demonstrated that the net erosion of molybdenum near the center of the samples exposed with 13CH4 injection was below the measurement resolution of 0.5 nm, corresponding to a rate of ≤0.04 nm/s. Compared to the previously measured erosion rates, this constitutes a reduction by a factor of >10.

UR - https://www.scopus.com/pages/publications/84937702158

UR - https://www.scopus.com/pages/publications/84937702158#tab=citedBy

U2 - 10.1016/j.jnucmat.2014.10.056

DO - 10.1016/j.jnucmat.2014.10.056

M3 - Article

AN - SCOPUS:84937702158

SN - 0022-3115

VL - 463

SP - 605

EP - 610

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

M1 - 48553

ER -

Control of high-Z PFC erosion by local gas injection in DIII-D

Abstract

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