Development of a radiative divertor for DIII-D

S. L. Allen; N. H. Brooks; R. B. Campbell; M. E. Fenstermacher; D. N. Hill; A. W. Hyatt; D. Knoll; C. J. Lasnier; E. A. Lazarus; A. W. Leonard; S. I. Lippmann; M. A. Mahdavi; R. Maingi; W. Meyer; R. A. Moyer; T. W. Petrie; G. D. Porter; M. E. Rensink; T. D. Rognlien; M. J. Schaffer; J. P. Smith; G. M. Staebler; R. D. Stambaugh; W. P. West; R. D. Wood

doi:10.1016/0022-3115(94)00495-1

Development of a radiative divertor for DIII-D

S. L. Allen, N. H. Brooks, R. B. Campbell, M. E. Fenstermacher, D. N. Hill, A. W. Hyatt, D. Knoll, C. J. Lasnier, E. A. Lazarus, A. W. Leonard, S. I. Lippmann, M. A. Mahdavi, R. Maingi, W. Meyer, R. A. Moyer, T. W. Petrie, G. D. Porter, M. E. Rensink, T. D. Rognlien, M. J. SchafferJ. P. Smith, G. M. Staebler, R. D. Stambaugh, W. P. West, R. D. Wood

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Abstract

We have used experiments and modeling to develop a new radiative divertor configuration for DIII-D. Gas puffing experiments with the existing open divertor have shown the creation of a localized (∼ 10 cm diameter) radiation zone which results in substantial reduction (3–10) in the divertor heat flux while τ_E remains ∼ 2 times ITER-89P scaling. However, n_e increases with D₂ puffing, and Z_eff increases with neon puffing. Divertor structures are required to minimize the effects on the core plasma. The UEDGE fluid code, benchmarked with DIII-D data, and the DEGAS neutrals transport code are used to estimate the effectiveness of divertor configurations; slots reduce the core ionization more than baffles. The overall divertor shape is set by confinement studies which indicate that high triangularity (δ ≈ 0.8) is important for high τ_E VH-modes. Results from engineering feasibility studies, including diagnostic access, will be presented.

Original language	English
Pages (from-to)	336-341
Number of pages	6
Journal	Journal of Nuclear Materials
Volume	220-222
DOIs	https://doi.org/10.1016/0022-3115(94)00495-1
State	Published - 1995
Externally published	Yes

Funding

We would like to acknowledge the work of the whole Radiative Divertor design team, which is a collaborative effort between several institutions. Work supported by the US Department of Energy under contract nos. W-7405-ENG-48 at LLNL, DE-AC093-89ERS5114 at General Atomics, DE-AC05-84OR21400 at ORNL, DE-AC04-76DP00789 at SNL, and DE-AC07-76ID01570 at INEL.

Funders	Funder number
US Department of Energy

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/0022-3115(94)00495-1

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Allen, S. L., Brooks, N. H., Campbell, R. B., Fenstermacher, M. E., Hill, D. N., Hyatt, A. W., Knoll, D., Lasnier, C. J., Lazarus, E. A., Leonard, A. W., Lippmann, S. I., Mahdavi, M. A., Maingi, R., Meyer, W., Moyer, R. A., Petrie, T. W., Porter, G. D., Rensink, M. E., Rognlien, T. D., ... Wood, R. D. (1995). Development of a radiative divertor for DIII-D. Journal of Nuclear Materials, 220-222, 336-341. https://doi.org/10.1016/0022-3115(94)00495-1

@article{c89aa8f5dc6d4683b4378871ee21847a,

title = "Development of a radiative divertor for DIII-D",

abstract = "We have used experiments and modeling to develop a new radiative divertor configuration for DIII-D. Gas puffing experiments with the existing open divertor have shown the creation of a localized (∼ 10 cm diameter) radiation zone which results in substantial reduction (3–10) in the divertor heat flux while τE remains ∼ 2 times ITER-89P scaling. However, ne increases with D2 puffing, and Zeff increases with neon puffing. Divertor structures are required to minimize the effects on the core plasma. The UEDGE fluid code, benchmarked with DIII-D data, and the DEGAS neutrals transport code are used to estimate the effectiveness of divertor configurations; slots reduce the core ionization more than baffles. The overall divertor shape is set by confinement studies which indicate that high triangularity (δ ≈ 0.8) is important for high τE VH-modes. Results from engineering feasibility studies, including diagnostic access, will be presented.",

author = "Allen, {S. L.} and Brooks, {N. H.} and Campbell, {R. B.} and Fenstermacher, {M. E.} and Hill, {D. N.} and Hyatt, {A. W.} and D. Knoll and Lasnier, {C. J.} and Lazarus, {E. A.} and Leonard, {A. W.} and Lippmann, {S. I.} and Mahdavi, {M. A.} and R. Maingi and W. Meyer and Moyer, {R. A.} and Petrie, {T. W.} and Porter, {G. D.} and Rensink, {M. E.} and Rognlien, {T. D.} and Schaffer, {M. J.} and Smith, {J. P.} and Staebler, {G. M.} and Stambaugh, {R. D.} and West, {W. P.} and Wood, {R. D.}",

year = "1995",

doi = "10.1016/0022-3115(94)00495-1",

language = "English",

volume = "220-222",

pages = "336--341",

journal = "Journal of Nuclear Materials",

issn = "0022-3115",

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Allen, SL, Brooks, NH, Campbell, RB, Fenstermacher, ME, Hill, DN, Hyatt, AW, Knoll, D, Lasnier, CJ, Lazarus, EA, Leonard, AW, Lippmann, SI, Mahdavi, MA, Maingi, R, Meyer, W, Moyer, RA, Petrie, TW, Porter, GD, Rensink, ME, Rognlien, TD, Schaffer, MJ, Smith, JP, Staebler, GM, Stambaugh, RD, West, WP & Wood, RD 1995, 'Development of a radiative divertor for DIII-D', Journal of Nuclear Materials, vol. 220-222, pp. 336-341. https://doi.org/10.1016/0022-3115(94)00495-1

TY - JOUR

T1 - Development of a radiative divertor for DIII-D

AU - Allen, S. L.

AU - Brooks, N. H.

AU - Campbell, R. B.

AU - Fenstermacher, M. E.

AU - Hill, D. N.

AU - Hyatt, A. W.

AU - Knoll, D.

AU - Lasnier, C. J.

AU - Lazarus, E. A.

AU - Leonard, A. W.

AU - Lippmann, S. I.

AU - Mahdavi, M. A.

AU - Maingi, R.

AU - Meyer, W.

AU - Moyer, R. A.

AU - Petrie, T. W.

AU - Porter, G. D.

AU - Rensink, M. E.

AU - Rognlien, T. D.

AU - Schaffer, M. J.

AU - Smith, J. P.

AU - Staebler, G. M.

AU - Stambaugh, R. D.

AU - West, W. P.

AU - Wood, R. D.

PY - 1995

Y1 - 1995

N2 - We have used experiments and modeling to develop a new radiative divertor configuration for DIII-D. Gas puffing experiments with the existing open divertor have shown the creation of a localized (∼ 10 cm diameter) radiation zone which results in substantial reduction (3–10) in the divertor heat flux while τE remains ∼ 2 times ITER-89P scaling. However, ne increases with D2 puffing, and Zeff increases with neon puffing. Divertor structures are required to minimize the effects on the core plasma. The UEDGE fluid code, benchmarked with DIII-D data, and the DEGAS neutrals transport code are used to estimate the effectiveness of divertor configurations; slots reduce the core ionization more than baffles. The overall divertor shape is set by confinement studies which indicate that high triangularity (δ ≈ 0.8) is important for high τE VH-modes. Results from engineering feasibility studies, including diagnostic access, will be presented.

AB - We have used experiments and modeling to develop a new radiative divertor configuration for DIII-D. Gas puffing experiments with the existing open divertor have shown the creation of a localized (∼ 10 cm diameter) radiation zone which results in substantial reduction (3–10) in the divertor heat flux while τE remains ∼ 2 times ITER-89P scaling. However, ne increases with D2 puffing, and Zeff increases with neon puffing. Divertor structures are required to minimize the effects on the core plasma. The UEDGE fluid code, benchmarked with DIII-D data, and the DEGAS neutrals transport code are used to estimate the effectiveness of divertor configurations; slots reduce the core ionization more than baffles. The overall divertor shape is set by confinement studies which indicate that high triangularity (δ ≈ 0.8) is important for high τE VH-modes. Results from engineering feasibility studies, including diagnostic access, will be presented.

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U2 - 10.1016/0022-3115(94)00495-1

DO - 10.1016/0022-3115(94)00495-1

M3 - Article

AN - SCOPUS:0345113759

SN - 0022-3115

VL - 220-222

SP - 336

EP - 341

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

ER -

Development of a radiative divertor for DIII-D

Abstract

Funding

UN SDGs

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