DIVIMP modeling of the toroidally symmetrical injection of 13CH4 into the upper SOL of DIII-D

A. G. McLean; J. D. Elder; P. C. Stangeby; S. L. Allen; J. A. Boedo; N. H. Brooks; M. E. Fenstermacher; M. Groth; S. Lisgo; A. Nagy; D. L. Rudakov; W. R. Wampler; J. G. Watkins; W. P. West; D. G. Whyte

doi:10.1016/j.jnucmat.2004.10.130

DIVIMP modeling of the toroidally symmetrical injection of ¹³CH₄ into the upper SOL of DIII-D

A. G. McLean
, J. D. Elder
, P. C. Stangeby
, S. L. Allen
, J. A. Boedo
, N. H. Brooks
, M. E. Fenstermacher
, M. Groth
, S. Lisgo
, A. Nagy
, D. L. Rudakov
, W. R. Wampler
, J. G. Watkins
, W. P. West
, D. G. Whyte

PPPL Engineering

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

24 Scopus citations

Abstract

As part of a study of carbon-tritium co-deposition, we carried out an experiment on DIII-D involving a toroidally symmetric injection of ¹³CH₄ at the top of a LSN discharge. A Monte Carlo code, DIVIMP-HC, which includes molecular breakup of hydrocarbons, was used to model the region near the puff. The interpretive analysis indicates a parallel flow in the SOL of M_∥ ∼ 0.4 directed toward the inner divertor. The CH₄ is ionized in the periphery of the SOL and so the particle confinement time, τ_c, is not high, only ∼5 ms, and about 4X lower than if the CH₄ were ionized at the separatrix. For such a wall injection location, however, approximately 60-75% of the CH₄ gets ionized to C⁺, C²⁺, etc., and is efficiently transported along the SOL to the inner divertor, trapping hydrogen by co-deposition there.

Original language	English (US)
Pages (from-to)	124-128
Number of pages	5
Journal	Journal of Nuclear Materials
Volume	337-339
Issue number	1-3 SPEC. ISS.
DOIs	https://doi.org/10.1016/j.jnucmat.2004.10.130
State	Published - Mar 1 2005

All Science Journal Classification (ASJC) codes

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

Keywords

Carbon impurities
DIII-D
DIVIMP
Edge modeling
Hydrocarbons

Access to Document

10.1016/j.jnucmat.2004.10.130

Cite this

McLean, A. G., Elder, J. D., Stangeby, P. C., Allen, S. L., Boedo, J. A., Brooks, N. H., Fenstermacher, M. E., Groth, M., Lisgo, S., Nagy, A., Rudakov, D. L., Wampler, W. R., Watkins, J. G., West, W. P., & Whyte, D. G. (2005). DIVIMP modeling of the toroidally symmetrical injection of ¹³CH₄ into the upper SOL of DIII-D. Journal of Nuclear Materials, 337-339(1-3 SPEC. ISS.), 124-128. https://doi.org/10.1016/j.jnucmat.2004.10.130

@article{45e11ad95835441999363237b3934138,

title = "DIVIMP modeling of the toroidally symmetrical injection of 13CH4 into the upper SOL of DIII-D",

abstract = "As part of a study of carbon-tritium co-deposition, we carried out an experiment on DIII-D involving a toroidally symmetric injection of 13CH4 at the top of a LSN discharge. A Monte Carlo code, DIVIMP-HC, which includes molecular breakup of hydrocarbons, was used to model the region near the puff. The interpretive analysis indicates a parallel flow in the SOL of M∥ ∼ 0.4 directed toward the inner divertor. The CH4 is ionized in the periphery of the SOL and so the particle confinement time, τc, is not high, only ∼5 ms, and about 4X lower than if the CH4 were ionized at the separatrix. For such a wall injection location, however, approximately 60-75\% of the CH4 gets ionized to C+, C2+, etc., and is efficiently transported along the SOL to the inner divertor, trapping hydrogen by co-deposition there.",

keywords = "Carbon impurities, DIII-D, DIVIMP, Edge modeling, Hydrocarbons",

author = "McLean, \{A. G.\} and Elder, \{J. D.\} and Stangeby, \{P. C.\} and Allen, \{S. L.\} and Boedo, \{J. A.\} and Brooks, \{N. H.\} and Fenstermacher, \{M. E.\} and M. Groth and S. Lisgo and A. Nagy and Rudakov, \{D. L.\} and Wampler, \{W. R.\} and Watkins, \{J. G.\} and West, \{W. P.\} and Whyte, \{D. G.\}",

year = "2005",

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doi = "10.1016/j.jnucmat.2004.10.130",

language = "English (US)",

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McLean, AG, Elder, JD, Stangeby, PC, Allen, SL, Boedo, JA, Brooks, NH, Fenstermacher, ME, Groth, M, Lisgo, S, Nagy, A, Rudakov, DL, Wampler, WR, Watkins, JG, West, WP & Whyte, DG 2005, 'DIVIMP modeling of the toroidally symmetrical injection of ¹³CH₄ into the upper SOL of DIII-D', Journal of Nuclear Materials, vol. 337-339, no. 1-3 SPEC. ISS., pp. 124-128. https://doi.org/10.1016/j.jnucmat.2004.10.130

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T1 - DIVIMP modeling of the toroidally symmetrical injection of 13CH4 into the upper SOL of DIII-D

AU - McLean, A. G.

AU - Elder, J. D.

AU - Stangeby, P. C.

AU - Allen, S. L.

AU - Boedo, J. A.

AU - Brooks, N. H.

AU - Fenstermacher, M. E.

AU - Groth, M.

AU - Lisgo, S.

AU - Nagy, A.

AU - Rudakov, D. L.

AU - Wampler, W. R.

AU - Watkins, J. G.

AU - West, W. P.

AU - Whyte, D. G.

PY - 2005/3/1

Y1 - 2005/3/1

N2 - As part of a study of carbon-tritium co-deposition, we carried out an experiment on DIII-D involving a toroidally symmetric injection of 13CH4 at the top of a LSN discharge. A Monte Carlo code, DIVIMP-HC, which includes molecular breakup of hydrocarbons, was used to model the region near the puff. The interpretive analysis indicates a parallel flow in the SOL of M∥ ∼ 0.4 directed toward the inner divertor. The CH4 is ionized in the periphery of the SOL and so the particle confinement time, τc, is not high, only ∼5 ms, and about 4X lower than if the CH4 were ionized at the separatrix. For such a wall injection location, however, approximately 60-75% of the CH4 gets ionized to C+, C2+, etc., and is efficiently transported along the SOL to the inner divertor, trapping hydrogen by co-deposition there.

AB - As part of a study of carbon-tritium co-deposition, we carried out an experiment on DIII-D involving a toroidally symmetric injection of 13CH4 at the top of a LSN discharge. A Monte Carlo code, DIVIMP-HC, which includes molecular breakup of hydrocarbons, was used to model the region near the puff. The interpretive analysis indicates a parallel flow in the SOL of M∥ ∼ 0.4 directed toward the inner divertor. The CH4 is ionized in the periphery of the SOL and so the particle confinement time, τc, is not high, only ∼5 ms, and about 4X lower than if the CH4 were ionized at the separatrix. For such a wall injection location, however, approximately 60-75% of the CH4 gets ionized to C+, C2+, etc., and is efficiently transported along the SOL to the inner divertor, trapping hydrogen by co-deposition there.

KW - Carbon impurities

KW - DIII-D

KW - DIVIMP

KW - Edge modeling

KW - Hydrocarbons

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VL - 337-339

SP - 124

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JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

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