Plasma interactions with the outboard chamber wall in DIII-D

D. L. Rudakov; J. A. Boedo; J. H. Yu; N. H. Brooks; M. E. Fenstermacher; M. Groth; E. M. Hollmann; C. J. Lasnier; A. G. McLean; R. A. Moyer; P. C. Stangeby; G. R. Tynan; W. R. Wampler; J. G. Watkins; W. P. West; C. P C Wong; R. J. Bastasz; D. Buchenauer; J. Whaley

doi:10.1016/j.jnucmat.2009.01.208

Plasma interactions with the outboard chamber wall in DIII-D

D. L. Rudakov^*, J. A. Boedo, J. H. Yu, N. H. Brooks, M. E. Fenstermacher, M. Groth, E. M. Hollmann, C. J. Lasnier, A. G. McLean, R. A. Moyer, P. C. Stangeby, G. R. Tynan, W. R. Wampler, J. G. Watkins, W. P. West, C. P C Wong, R. J. Bastasz, D. Buchenauer, J. Whaley

^*Corresponding author for this work

Not published at Aalto University

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

9 Citations (Scopus)

Abstract

Erosion of the main chamber plasma-facing components is of concern for ITER. Plasma interaction with the outboard chamber wall is studied in DIII-D using Langmuir probes and optical diagnostics. Fast camera data shows that edge localized modes (ELMs) feature helical filamentary structures propagating towards the outboard wall. Upon reaching the wall, filaments result in regions of local intense plasma-material interaction (PMI) where peak incident particle and heat fluxes are up to two orders of magnitude higher than those between ELMs. In low density/collisionality H-mode discharges, PMI at the outboard wall is almost entirely due to ELMs. A moderate change of the gap between the separatrix and the outer wall strongly affects PMI intensity at the wall. Material samples exposed near the outboard wall showed net carbon deposition in high-density discharges (near the Greenwald limit) and tendency towards net erosion in lower density discharges (∼0.45 of the Greenwald limit).

Original language	English
Pages (from-to)	785-788
Number of pages	4
Journal	Journal of Nuclear Materials
Volume	390-391
DOIs	https://doi.org/10.1016/j.jnucmat.2009.01.208
Publication status	Published - 15 Jun 2009
MoE publication type	A1 Journal article-refereed

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Rudakov, D. L., Boedo, J. A., Yu, J. H., Brooks, N. H., Fenstermacher, M. E., Groth, M., Hollmann, E. M., Lasnier, C. J., McLean, A. G., Moyer, R. A., Stangeby, P. C., Tynan, G. R., Wampler, W. R., Watkins, J. G., West, W. P., Wong, C. P. C., Bastasz, R. J., Buchenauer, D., & Whaley, J. (2009). Plasma interactions with the outboard chamber wall in DIII-D. Journal of Nuclear Materials, 390-391, 785-788. https://doi.org/10.1016/j.jnucmat.2009.01.208

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title = "Plasma interactions with the outboard chamber wall in DIII-D",

abstract = "Erosion of the main chamber plasma-facing components is of concern for ITER. Plasma interaction with the outboard chamber wall is studied in DIII-D using Langmuir probes and optical diagnostics. Fast camera data shows that edge localized modes (ELMs) feature helical filamentary structures propagating towards the outboard wall. Upon reaching the wall, filaments result in regions of local intense plasma-material interaction (PMI) where peak incident particle and heat fluxes are up to two orders of magnitude higher than those between ELMs. In low density/collisionality H-mode discharges, PMI at the outboard wall is almost entirely due to ELMs. A moderate change of the gap between the separatrix and the outer wall strongly affects PMI intensity at the wall. Material samples exposed near the outboard wall showed net carbon deposition in high-density discharges (near the Greenwald limit) and tendency towards net erosion in lower density discharges (∼0.45 of the Greenwald limit).",

author = "Rudakov, {D. L.} and Boedo, {J. A.} and Yu, {J. H.} and Brooks, {N. H.} and Fenstermacher, {M. E.} and M. Groth and Hollmann, {E. M.} and Lasnier, {C. J.} and McLean, {A. G.} and Moyer, {R. A.} and Stangeby, {P. C.} and Tynan, {G. R.} and Wampler, {W. R.} and Watkins, {J. G.} and West, {W. P.} and Wong, {C. P C} and Bastasz, {R. J.} and D. Buchenauer and J. Whaley",

year = "2009",

month = jun,

day = "15",

doi = "10.1016/j.jnucmat.2009.01.208",

language = "English",

volume = "390-391",

pages = "785--788",

journal = "Journal of Nuclear Materials",

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Rudakov, DL, Boedo, JA, Yu, JH, Brooks, NH, Fenstermacher, ME, Groth, M, Hollmann, EM, Lasnier, CJ, McLean, AG, Moyer, RA, Stangeby, PC, Tynan, GR, Wampler, WR, Watkins, JG, West, WP, Wong, CPC, Bastasz, RJ, Buchenauer, D & Whaley, J 2009, 'Plasma interactions with the outboard chamber wall in DIII-D', Journal of Nuclear Materials, vol. 390-391, pp. 785-788. https://doi.org/10.1016/j.jnucmat.2009.01.208

TY - JOUR

T1 - Plasma interactions with the outboard chamber wall in DIII-D

AU - Rudakov, D. L.

AU - Boedo, J. A.

AU - Yu, J. H.

AU - Brooks, N. H.

AU - Fenstermacher, M. E.

AU - Groth, M.

AU - Hollmann, E. M.

AU - Lasnier, C. J.

AU - McLean, A. G.

AU - Moyer, R. A.

AU - Stangeby, P. C.

AU - Tynan, G. R.

AU - Wampler, W. R.

AU - Watkins, J. G.

AU - West, W. P.

AU - Wong, C. P C

AU - Bastasz, R. J.

AU - Buchenauer, D.

AU - Whaley, J.

PY - 2009/6/15

Y1 - 2009/6/15

N2 - Erosion of the main chamber plasma-facing components is of concern for ITER. Plasma interaction with the outboard chamber wall is studied in DIII-D using Langmuir probes and optical diagnostics. Fast camera data shows that edge localized modes (ELMs) feature helical filamentary structures propagating towards the outboard wall. Upon reaching the wall, filaments result in regions of local intense plasma-material interaction (PMI) where peak incident particle and heat fluxes are up to two orders of magnitude higher than those between ELMs. In low density/collisionality H-mode discharges, PMI at the outboard wall is almost entirely due to ELMs. A moderate change of the gap between the separatrix and the outer wall strongly affects PMI intensity at the wall. Material samples exposed near the outboard wall showed net carbon deposition in high-density discharges (near the Greenwald limit) and tendency towards net erosion in lower density discharges (∼0.45 of the Greenwald limit).

AB - Erosion of the main chamber plasma-facing components is of concern for ITER. Plasma interaction with the outboard chamber wall is studied in DIII-D using Langmuir probes and optical diagnostics. Fast camera data shows that edge localized modes (ELMs) feature helical filamentary structures propagating towards the outboard wall. Upon reaching the wall, filaments result in regions of local intense plasma-material interaction (PMI) where peak incident particle and heat fluxes are up to two orders of magnitude higher than those between ELMs. In low density/collisionality H-mode discharges, PMI at the outboard wall is almost entirely due to ELMs. A moderate change of the gap between the separatrix and the outer wall strongly affects PMI intensity at the wall. Material samples exposed near the outboard wall showed net carbon deposition in high-density discharges (near the Greenwald limit) and tendency towards net erosion in lower density discharges (∼0.45 of the Greenwald limit).

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M3 - Article

AN - SCOPUS:67349176098

SN - 0022-3115

VL - 390-391

SP - 785

EP - 788

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

ER -

Plasma interactions with the outboard chamber wall in DIII-D

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