Studies of high-δ (baffled) and low-δ (open) pumped divertor operation on DIII-D

S. L. Allen; M. E. Fenstermacher; C. M. Greenfield; A. W. Hyatt; R. Maingi; G. D. Porter; M. R. Wade; A. S. Bozek; Robert A. Ellis; D. N. Hill; M. A. Hollerbach; C. J. Lasnier; A. W. Leonard; M. A. Mahdavi; D. G. Nilson; T. W. Petrie; M. J. Schaffer; J. P. Smith; R. D. Stambaugh; D. M. Thomas; J. G. Watkins; W. P. West; D. G. Whyte; R. D. Wood

doi:10.1016/S0022-3115(98)00523-6

Studies of high-δ (baffled) and low-δ (open) pumped divertor operation on DIII-D

S. L. Allen, M. E. Fenstermacher, C. M. Greenfield, A. W. Hyatt, R. Maingi, G. D. Porter, M. R. Wade, A. S. Bozek, Robert A. Ellis, D. N. Hill, M. A. Hollerbach, C. J. Lasnier, A. W. Leonard, M. A. Mahdavi, D. G. Nilson, T. W. Petrie, M. J. Schaffer, J. P. Smith, R. D. Stambaugh, D. M. ThomasJ. G. Watkins, W. P. West, D. G. Whyte, R. D. Wood

PPPL Engineering

Research output: Contribution to journal › Conference article › peer-review

24 Scopus citations

Abstract

We report new experimental results with the Radiative Divertor Project-outer baffle (RDP-OB) and cryopump in both upper single-null (USN) and double-null (DN) ELMing H-mode discharges. The baffled divertor reduced the core ionization (approximately 2-2.5×), in reasonable agreement with predictions from UEDGE/DEGAS modeling (approximately 3.75×). The upper cryopump achieved density control of n_e/n_gw to approximately 0.22 (line density/Greenwald density) with Z_eff to approximately 2 in high-δ plasmas. The measured exhaust is comparable to the lower pump, except at lower core electron densities (n_e<5×10¹⁹ m^-3). Efficient impurity exhaust was obtained with deuterium SOL flow. Preliminary experiments with DN operation has shown that the particle exhaust to the upper pump depends on the up/down magnetic balance. Preliminary experiments indicate that the DN exhaust is roughly 40-50% of the USN exhaust at n_e to approximately 4×10¹⁹ m^-3.

Original language	English (US)
Pages (from-to)	168-174
Number of pages	7
Journal	Journal of Nuclear Materials
Volume	266
DOIs	https://doi.org/10.1016/S0022-3115(98)00523-6
State	Published - Mar 2 1999

All Science Journal Classification (ASJC) codes

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

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Allen, S. L., Fenstermacher, M. E., Greenfield, C. M., Hyatt, A. W., Maingi, R., Porter, G. D., Wade, M. R., Bozek, A. S., Ellis, R. A., Hill, D. N., Hollerbach, M. A., Lasnier, C. J., Leonard, A. W., Mahdavi, M. A., Nilson, D. G., Petrie, T. W., Schaffer, M. J., Smith, J. P., Stambaugh, R. D., ... Wood, R. D. (1999). Studies of high-δ (baffled) and low-δ (open) pumped divertor operation on DIII-D. Journal of Nuclear Materials, 266, 168-174. https://doi.org/10.1016/S0022-3115(98)00523-6

@article{8b9fc990c9dc457dba067e571180f2b2,

title = "Studies of high-δ (baffled) and low-δ (open) pumped divertor operation on DIII-D",

abstract = "We report new experimental results with the Radiative Divertor Project-outer baffle (RDP-OB) and cryopump in both upper single-null (USN) and double-null (DN) ELMing H-mode discharges. The baffled divertor reduced the core ionization (approximately 2-2.5×), in reasonable agreement with predictions from UEDGE/DEGAS modeling (approximately 3.75×). The upper cryopump achieved density control of ne/ngw to approximately 0.22 (line density/Greenwald density) with Zeff to approximately 2 in high-δ plasmas. The measured exhaust is comparable to the lower pump, except at lower core electron densities (ne<5×1019 m-3). Efficient impurity exhaust was obtained with deuterium SOL flow. Preliminary experiments with DN operation has shown that the particle exhaust to the upper pump depends on the up/down magnetic balance. Preliminary experiments indicate that the DN exhaust is roughly 40-50\% of the USN exhaust at ne to approximately 4×1019 m-3.",

author = "Allen, \{S. L.\} and Fenstermacher, \{M. E.\} and Greenfield, \{C. M.\} and Hyatt, \{A. W.\} and R. Maingi and Porter, \{G. D.\} and Wade, \{M. R.\} and Bozek, \{A. S.\} and Ellis, \{Robert A.\} and Hill, \{D. N.\} and Hollerbach, \{M. A.\} and Lasnier, \{C. J.\} and Leonard, \{A. W.\} and Mahdavi, \{M. A.\} and Nilson, \{D. G.\} and Petrie, \{T. W.\} and Schaffer, \{M. J.\} and Smith, \{J. P.\} and Stambaugh, \{R. D.\} and Thomas, \{D. M.\} and Watkins, \{J. G.\} and West, \{W. P.\} and Whyte, \{D. G.\} and Wood, \{R. D.\}",

year = "1999",

month = mar,

day = "2",

doi = "10.1016/S0022-3115(98)00523-6",

language = "English (US)",

volume = "266",

pages = "168--174",

journal = "Journal of Nuclear Materials",

issn = "0022-3115",

publisher = "Elsevier B.V.",

}

Allen, SL, Fenstermacher, ME, Greenfield, CM, Hyatt, AW, Maingi, R, Porter, GD, Wade, MR, Bozek, AS, Ellis, RA, Hill, DN, Hollerbach, MA, Lasnier, CJ, Leonard, AW, Mahdavi, MA, Nilson, DG, Petrie, TW, Schaffer, MJ, Smith, JP, Stambaugh, RD, Thomas, DM, Watkins, JG, West, WP, Whyte, DG & Wood, RD 1999, 'Studies of high-δ (baffled) and low-δ (open) pumped divertor operation on DIII-D', Journal of Nuclear Materials, vol. 266, pp. 168-174. https://doi.org/10.1016/S0022-3115(98)00523-6

TY - JOUR

T1 - Studies of high-δ (baffled) and low-δ (open) pumped divertor operation on DIII-D

AU - Allen, S. L.

AU - Fenstermacher, M. E.

AU - Greenfield, C. M.

AU - Hyatt, A. W.

AU - Maingi, R.

AU - Porter, G. D.

AU - Wade, M. R.

AU - Bozek, A. S.

AU - Ellis, Robert A.

AU - Hill, D. N.

AU - Hollerbach, M. A.

AU - Lasnier, C. J.

AU - Leonard, A. W.

AU - Mahdavi, M. A.

AU - Nilson, D. G.

AU - Petrie, T. W.

AU - Schaffer, M. J.

AU - Smith, J. P.

AU - Stambaugh, R. D.

AU - Thomas, D. M.

AU - Watkins, J. G.

AU - West, W. P.

AU - Whyte, D. G.

AU - Wood, R. D.

PY - 1999/3/2

Y1 - 1999/3/2

N2 - We report new experimental results with the Radiative Divertor Project-outer baffle (RDP-OB) and cryopump in both upper single-null (USN) and double-null (DN) ELMing H-mode discharges. The baffled divertor reduced the core ionization (approximately 2-2.5×), in reasonable agreement with predictions from UEDGE/DEGAS modeling (approximately 3.75×). The upper cryopump achieved density control of ne/ngw to approximately 0.22 (line density/Greenwald density) with Zeff to approximately 2 in high-δ plasmas. The measured exhaust is comparable to the lower pump, except at lower core electron densities (ne<5×1019 m-3). Efficient impurity exhaust was obtained with deuterium SOL flow. Preliminary experiments with DN operation has shown that the particle exhaust to the upper pump depends on the up/down magnetic balance. Preliminary experiments indicate that the DN exhaust is roughly 40-50% of the USN exhaust at ne to approximately 4×1019 m-3.

AB - We report new experimental results with the Radiative Divertor Project-outer baffle (RDP-OB) and cryopump in both upper single-null (USN) and double-null (DN) ELMing H-mode discharges. The baffled divertor reduced the core ionization (approximately 2-2.5×), in reasonable agreement with predictions from UEDGE/DEGAS modeling (approximately 3.75×). The upper cryopump achieved density control of ne/ngw to approximately 0.22 (line density/Greenwald density) with Zeff to approximately 2 in high-δ plasmas. The measured exhaust is comparable to the lower pump, except at lower core electron densities (ne<5×1019 m-3). Efficient impurity exhaust was obtained with deuterium SOL flow. Preliminary experiments with DN operation has shown that the particle exhaust to the upper pump depends on the up/down magnetic balance. Preliminary experiments indicate that the DN exhaust is roughly 40-50% of the USN exhaust at ne to approximately 4×1019 m-3.

UR - https://www.scopus.com/pages/publications/0032627067

UR - https://www.scopus.com/inward/citedby.url?scp=0032627067&partnerID=8YFLogxK

U2 - 10.1016/S0022-3115(98)00523-6

DO - 10.1016/S0022-3115(98)00523-6

M3 - Conference article

AN - SCOPUS:0032627067

SN - 0022-3115

VL - 266

SP - 168

EP - 174

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

ER -

Studies of high-δ (baffled) and low-δ (open) pumped divertor operation on DIII-D

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