Indications of an inward pinch in the inner SOL of DIII-D from 13C deposition experiments

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

doi:10.1016/j.jnucmat.2009.01.080

Indications of an inward pinch in the inner SOL of DIII-D from 13C deposition experiments

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

^*Corresponding author for this work

Not published at Aalto University

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

8 Citations (Scopus)

Abstract

¹³C methane puffing experiments were conducted on DIII-D in both L- and ELMy H-mode conditions. The puffing was toroidally symmetric into the crown of a series of well-characterized lower single-null discharges. The hydrocarbon breakup, carbon transport and deposition were modeled using the OEDGE interpretive code. Three separate hypotheses were tested using OEDGE to try to reproduce the experimental deposition: Radial variation of fast parallel flow, erosion of the puffed ¹³C deposited in the divertor, and a pinch in the inner scrape off layer (SOL) towards the separatrix. A fast parallel flow was imposed for all hypotheses. The magnitude and the distribution of the ¹³C deposition resulting from each hypothesis are compared. A fast parallel flow in the SOL toward the inner divertor combined with a pinch/drift of 10-30 m/s in the inner SOL towards the separatrix roughly reproduces the deposition in both the L- and H-mode experiments.

Original language	English
Pages (from-to)	376-379
Number of pages	4
Journal	Journal of Nuclear Materials
Volume	390-391
DOIs	https://doi.org/10.1016/j.jnucmat.2009.01.080
Publication status	Published - 15 Jun 2009
MoE publication type	A1 Journal article-refereed

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Elder, J. D., McLean, A. G., Stangeby, P. C., Allen, S. L., Boedo, J. A., Bray, B. D., Brooks, N. H., Fenstermacher, M. E., Groth, M., Leonard, A. W., Rudakov, D. L., Wampler, W. R., Watkins, J. G., West, W. P., & Whyte, D. G. (2009). Indications of an inward pinch in the inner SOL of DIII-D from 13C deposition experiments. Journal of Nuclear Materials, 390-391, 376-379. https://doi.org/10.1016/j.jnucmat.2009.01.080

Elder, J. D. ; McLean, A. G. ; Stangeby, P. C. ; Allen, S. L. ; Boedo, J. A. ; Bray, B. D. ; Brooks, N. H. ; Fenstermacher, M. E. ; Groth, M. ; Leonard, A. W. ; Rudakov, D. L. ; Wampler, W. R. ; Watkins, J. G. ; West, W. P. ; Whyte, D. G. / Indications of an inward pinch in the inner SOL of DIII-D from 13C deposition experiments. In: Journal of Nuclear Materials. 2009 ; Vol. 390-391. pp. 376-379.

@article{fd2651d419d34404b768e4dcf4468af7,

title = "Indications of an inward pinch in the inner SOL of DIII-D from 13C deposition experiments",

abstract = " 13C methane puffing experiments were conducted on DIII-D in both L- and ELMy H-mode conditions. The puffing was toroidally symmetric into the crown of a series of well-characterized lower single-null discharges. The hydrocarbon breakup, carbon transport and deposition were modeled using the OEDGE interpretive code. Three separate hypotheses were tested using OEDGE to try to reproduce the experimental deposition: Radial variation of fast parallel flow, erosion of the puffed 13C deposited in the divertor, and a pinch in the inner scrape off layer (SOL) towards the separatrix. A fast parallel flow was imposed for all hypotheses. The magnitude and the distribution of the 13C deposition resulting from each hypothesis are compared. A fast parallel flow in the SOL toward the inner divertor combined with a pinch/drift of 10-30 m/s in the inner SOL towards the separatrix roughly reproduces the deposition in both the L- and H-mode experiments.",

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

year = "2009",

month = jun,

day = "15",

doi = "10.1016/j.jnucmat.2009.01.080",

language = "English",

volume = "390-391",

pages = "376--379",

journal = "Journal of Nuclear Materials",

issn = "0022-3115",

}

Elder, JD, McLean, AG, Stangeby, PC, Allen, SL, Boedo, JA, Bray, BD, Brooks, NH, Fenstermacher, ME, Groth, M, Leonard, AW, Rudakov, DL, Wampler, WR, Watkins, JG, West, WP & Whyte, DG 2009, 'Indications of an inward pinch in the inner SOL of DIII-D from 13C deposition experiments', Journal of Nuclear Materials, vol. 390-391, pp. 376-379. https://doi.org/10.1016/j.jnucmat.2009.01.080

Indications of an inward pinch in the inner SOL of DIII-D from 13C deposition experiments. / Elder, J. D.; McLean, A. G.; Stangeby, P. C.; Allen, S. L.; Boedo, J. A.; Bray, B. D.; Brooks, N. H.; Fenstermacher, M. E.; Groth, M.; Leonard, A. W.; Rudakov, D. L.; Wampler, W. R.; Watkins, J. G.; West, W. P.; Whyte, D. G.

In: Journal of Nuclear Materials, Vol. 390-391, 15.06.2009, p. 376-379.

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

TY - JOUR

T1 - Indications of an inward pinch in the inner SOL of DIII-D from 13C deposition experiments

AU - Elder, J. D.

AU - McLean, A. G.

AU - Stangeby, P. C.

AU - Allen, S. L.

AU - Boedo, J. A.

AU - Bray, B. D.

AU - Brooks, N. H.

AU - Fenstermacher, M. E.

AU - Groth, M.

AU - Leonard, A. W.

AU - Rudakov, D. L.

AU - Wampler, W. R.

AU - Watkins, J. G.

AU - West, W. P.

AU - Whyte, D. G.

PY - 2009/6/15

Y1 - 2009/6/15

N2 - 13C methane puffing experiments were conducted on DIII-D in both L- and ELMy H-mode conditions. The puffing was toroidally symmetric into the crown of a series of well-characterized lower single-null discharges. The hydrocarbon breakup, carbon transport and deposition were modeled using the OEDGE interpretive code. Three separate hypotheses were tested using OEDGE to try to reproduce the experimental deposition: Radial variation of fast parallel flow, erosion of the puffed 13C deposited in the divertor, and a pinch in the inner scrape off layer (SOL) towards the separatrix. A fast parallel flow was imposed for all hypotheses. The magnitude and the distribution of the 13C deposition resulting from each hypothesis are compared. A fast parallel flow in the SOL toward the inner divertor combined with a pinch/drift of 10-30 m/s in the inner SOL towards the separatrix roughly reproduces the deposition in both the L- and H-mode experiments.

AB - 13C methane puffing experiments were conducted on DIII-D in both L- and ELMy H-mode conditions. The puffing was toroidally symmetric into the crown of a series of well-characterized lower single-null discharges. The hydrocarbon breakup, carbon transport and deposition were modeled using the OEDGE interpretive code. Three separate hypotheses were tested using OEDGE to try to reproduce the experimental deposition: Radial variation of fast parallel flow, erosion of the puffed 13C deposited in the divertor, and a pinch in the inner scrape off layer (SOL) towards the separatrix. A fast parallel flow was imposed for all hypotheses. The magnitude and the distribution of the 13C deposition resulting from each hypothesis are compared. A fast parallel flow in the SOL toward the inner divertor combined with a pinch/drift of 10-30 m/s in the inner SOL towards the separatrix roughly reproduces the deposition in both the L- and H-mode experiments.

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U2 - 10.1016/j.jnucmat.2009.01.080

DO - 10.1016/j.jnucmat.2009.01.080

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VL - 390-391

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EP - 379

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

SN - 0022-3115

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