The two-dimensional structure of radiative divertor plasmas in the DIII-D tokamak

M. E. Fenstermacher; S. L. Allen; N. H. Brooks; D. A. Buchenauer; T. N. Carlstrom; J. W. Cuthbertson; E. J. Doyle; T. E. Evans; P. M. Garbet; R. W. Harvey; D. N. Hill; A. W. Hyatt; R. C. Isler; G. Jackson; R. A. James; R. Jong; C. C. Klepper; C. J. Lasnier; A. W. Leonard; M. A. Mahdavi; R. Maingi; W. H. Meyer; R. A. Moyer; D. G. Nilson; T. W. Petrie; G. D. Porter; T. L. Rhodes; M. J. Schaffer; R. D. Stambaugh; D. M. Thomas; S. Tugarinov; M. R. Wade; J. G. Watkins; W. P. West; D. G. Whyte; R. D. Wood

doi:10.1063/1.872278

The two-dimensional structure of radiative divertor plasmas in the DIII-D tokamak

M. E. Fenstermacher, S. L. Allen, N. H. Brooks, D. A. Buchenauer, T. N. Carlstrom, J. W. Cuthbertson, E. J. Doyle, T. E. Evans, P. M. Garbet, R. W. Harvey, D. N. Hill, A. W. Hyatt, R. C. Isler, G. Jackson, R. A. James, R. Jong, C. C. Klepper, C. J. Lasnier, A. W. Leonard, M. A. MahdaviR. Maingi, W. H. Meyer, R. A. Moyer, D. G. Nilson, T. W. Petrie, G. D. Porter, T. L. Rhodes, M. J. Schaffer, R. D. Stambaugh, D. M. Thomas, S. Tugarinov, M. R. Wade, J. G. Watkins, W. P. West, D. G. Whyte, R. D. Wood

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Abstract

Recent measurements of the two-dimensional (2-D) spatial profiles of divertor plasma density, temperature, and emissivity in the DIII-D tokamak [J. Luxon et al., in Proceedings of the 11th International Conference on Plasma Physics and Controlled Nuclear Fusion (International Atomic Energy Agency, Vienna, 1987), p. 159] under highly radiating conditions are presented. Data are obtained using a divertor Thomson scattering system and other diagnostics optimized for measuring the high electron densities and low temperatures in these detached divertor plasmas ([formula omitted] [formula omitted]). [formula omitted] gas injection in the divertor increases the plasma radiation and lowers [formula omitted] to less than 2 eV in most of the divertor volume. Modeling shows that this temperature is low enough to allow ion–neutral collisions, charge exchange, and volume recombination to play significant roles in reducing the plasma pressure along the magnetic separatrix by a factor of 3–5, consistent with the measurements. Absolutely calibrated vacuum ultraviolet spectroscopy and 2-D images of impurity emission show that carbon radiation near the X-point, and deuterium radiation near the target plates contribute to the reduction in [formula omitted] Uniformity of radiated power [formula omitted] (within a factor of 2) along the outer divertor leg, with peak heat flux on the divertor target reduced fourfold, was obtained. A comparison with 2-D fluid simulations shows good agreement when physical sputtering and an ad hoc chemical sputtering source (0.5%) from the private flux region surface are used.

Original language	English
Pages (from-to)	1761-1773
Number of pages	13
Journal	Physics of Plasmas
Volume	4
Issue number	5
DOIs	https://doi.org/10.1063/1.872278
State	Published - May 1997
Externally published	Yes

Keywords

COMPUTERIZED SIMULATION
DIVERTORS
ELECTRON TEMPERATURE
HEAT TRANSFER
ION-ATOM COLLISIONS
PLASMA DENSITY
PLASMA DIAGNOSTICS
PLASMA PRESSURE
TOKAMAK DEVICES

UN SDGs

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

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10.1063/1.872278

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Fenstermacher, M. E., Allen, S. L., Brooks, N. H., Buchenauer, D. A., Carlstrom, T. N., Cuthbertson, J. W., Doyle, E. J., Evans, T. E., Garbet, P. M., Harvey, R. W., Hill, D. N., Hyatt, A. W., Isler, R. C., Jackson, G., James, R. A., Jong, R., Klepper, C. C., Lasnier, C. J., Leonard, A. W., ... Wood, R. D. (1997). The two-dimensional structure of radiative divertor plasmas in the DIII-D tokamak. Physics of Plasmas, 4(5), 1761-1773. https://doi.org/10.1063/1.872278

@article{88b31d73335d4503838afedc4b8b6d7a,

title = "The two-dimensional structure of radiative divertor plasmas in the DIII-D tokamak",

abstract = "Recent measurements of the two-dimensional (2-D) spatial profiles of divertor plasma density, temperature, and emissivity in the DIII-D tokamak [J. Luxon et al., in Proceedings of the 11th International Conference on Plasma Physics and Controlled Nuclear Fusion (International Atomic Energy Agency, Vienna, 1987), p. 159] under highly radiating conditions are presented. Data are obtained using a divertor Thomson scattering system and other diagnostics optimized for measuring the high electron densities and low temperatures in these detached divertor plasmas ([formula omitted] [formula omitted]). [formula omitted] gas injection in the divertor increases the plasma radiation and lowers [formula omitted] to less than 2 eV in most of the divertor volume. Modeling shows that this temperature is low enough to allow ion–neutral collisions, charge exchange, and volume recombination to play significant roles in reducing the plasma pressure along the magnetic separatrix by a factor of 3–5, consistent with the measurements. Absolutely calibrated vacuum ultraviolet spectroscopy and 2-D images of impurity emission show that carbon radiation near the X-point, and deuterium radiation near the target plates contribute to the reduction in [formula omitted] Uniformity of radiated power [formula omitted] (within a factor of 2) along the outer divertor leg, with peak heat flux on the divertor target reduced fourfold, was obtained. A comparison with 2-D fluid simulations shows good agreement when physical sputtering and an ad hoc chemical sputtering source (0.5%) from the private flux region surface are used.",

keywords = "COMPUTERIZED SIMULATION, DIVERTORS, ELECTRON TEMPERATURE, HEAT TRANSFER, ION-ATOM COLLISIONS, PLASMA DENSITY, PLASMA DIAGNOSTICS, PLASMA PRESSURE, TOKAMAK DEVICES",

author = "Fenstermacher, {M. E.} and Allen, {S. L.} and Brooks, {N. H.} and Buchenauer, {D. A.} and Carlstrom, {T. N.} and Cuthbertson, {J. W.} and Doyle, {E. J.} and Evans, {T. E.} and Garbet, {P. M.} and Harvey, {R. W.} and Hill, {D. N.} and Hyatt, {A. W.} and Isler, {R. C.} and G. Jackson and James, {R. A.} and R. Jong and Klepper, {C. C.} and Lasnier, {C. J.} and Leonard, {A. W.} and Mahdavi, {M. A.} and R. Maingi and Meyer, {W. H.} and Moyer, {R. A.} and Nilson, {D. G.} and Petrie, {T. W.} and Porter, {G. D.} and Rhodes, {T. L.} and Schaffer, {M. J.} and Stambaugh, {R. D.} and Thomas, {D. M.} and S. Tugarinov and Wade, {M. R.} and Watkins, {J. G.} and West, {W. P.} and Whyte, {D. G.} and Wood, {R. D.}",

year = "1997",

month = may,

doi = "10.1063/1.872278",

language = "English",

volume = "4",

pages = "1761--1773",

journal = "Physics of Plasmas",

issn = "1070-664X",

publisher = "American Institute of Physics",

number = "5",

}

Fenstermacher, ME, Allen, SL, Brooks, NH, Buchenauer, DA, Carlstrom, TN, Cuthbertson, JW, Doyle, EJ, Evans, TE, Garbet, PM, Harvey, RW, Hill, DN, Hyatt, AW, Isler, RC, Jackson, G, James, RA, Jong, R, Klepper, CC, Lasnier, CJ, Leonard, AW, Mahdavi, MA, Maingi, R, Meyer, WH, Moyer, RA, Nilson, DG, Petrie, TW, Porter, GD, Rhodes, TL, Schaffer, MJ, Stambaugh, RD, Thomas, DM, Tugarinov, S, Wade, MR, Watkins, JG, West, WP, Whyte, DG & Wood, RD 1997, 'The two-dimensional structure of radiative divertor plasmas in the DIII-D tokamak', Physics of Plasmas, vol. 4, no. 5, pp. 1761-1773. https://doi.org/10.1063/1.872278

TY - JOUR

T1 - The two-dimensional structure of radiative divertor plasmas in the DIII-D tokamak

AU - Fenstermacher, M. E.

AU - Allen, S. L.

AU - Brooks, N. H.

AU - Buchenauer, D. A.

AU - Carlstrom, T. N.

AU - Cuthbertson, J. W.

AU - Doyle, E. J.

AU - Evans, T. E.

AU - Garbet, P. M.

AU - Harvey, R. W.

AU - Hill, D. N.

AU - Hyatt, A. W.

AU - Isler, R. C.

AU - Jackson, G.

AU - James, R. A.

AU - Jong, R.

AU - Klepper, C. C.

AU - Lasnier, C. J.

AU - Leonard, A. W.

AU - Mahdavi, M. A.

AU - Maingi, R.

AU - Meyer, W. H.

AU - Moyer, R. A.

AU - Nilson, D. G.

AU - Petrie, T. W.

AU - Porter, G. D.

AU - Rhodes, T. L.

AU - Schaffer, M. J.

AU - Stambaugh, R. D.

AU - Thomas, D. M.

AU - Tugarinov, S.

AU - Wade, M. R.

AU - Watkins, J. G.

AU - West, W. P.

AU - Whyte, D. G.

AU - Wood, R. D.

PY - 1997/5

Y1 - 1997/5

N2 - Recent measurements of the two-dimensional (2-D) spatial profiles of divertor plasma density, temperature, and emissivity in the DIII-D tokamak [J. Luxon et al., in Proceedings of the 11th International Conference on Plasma Physics and Controlled Nuclear Fusion (International Atomic Energy Agency, Vienna, 1987), p. 159] under highly radiating conditions are presented. Data are obtained using a divertor Thomson scattering system and other diagnostics optimized for measuring the high electron densities and low temperatures in these detached divertor plasmas ([formula omitted] [formula omitted]). [formula omitted] gas injection in the divertor increases the plasma radiation and lowers [formula omitted] to less than 2 eV in most of the divertor volume. Modeling shows that this temperature is low enough to allow ion–neutral collisions, charge exchange, and volume recombination to play significant roles in reducing the plasma pressure along the magnetic separatrix by a factor of 3–5, consistent with the measurements. Absolutely calibrated vacuum ultraviolet spectroscopy and 2-D images of impurity emission show that carbon radiation near the X-point, and deuterium radiation near the target plates contribute to the reduction in [formula omitted] Uniformity of radiated power [formula omitted] (within a factor of 2) along the outer divertor leg, with peak heat flux on the divertor target reduced fourfold, was obtained. A comparison with 2-D fluid simulations shows good agreement when physical sputtering and an ad hoc chemical sputtering source (0.5%) from the private flux region surface are used.

AB - Recent measurements of the two-dimensional (2-D) spatial profiles of divertor plasma density, temperature, and emissivity in the DIII-D tokamak [J. Luxon et al., in Proceedings of the 11th International Conference on Plasma Physics and Controlled Nuclear Fusion (International Atomic Energy Agency, Vienna, 1987), p. 159] under highly radiating conditions are presented. Data are obtained using a divertor Thomson scattering system and other diagnostics optimized for measuring the high electron densities and low temperatures in these detached divertor plasmas ([formula omitted] [formula omitted]). [formula omitted] gas injection in the divertor increases the plasma radiation and lowers [formula omitted] to less than 2 eV in most of the divertor volume. Modeling shows that this temperature is low enough to allow ion–neutral collisions, charge exchange, and volume recombination to play significant roles in reducing the plasma pressure along the magnetic separatrix by a factor of 3–5, consistent with the measurements. Absolutely calibrated vacuum ultraviolet spectroscopy and 2-D images of impurity emission show that carbon radiation near the X-point, and deuterium radiation near the target plates contribute to the reduction in [formula omitted] Uniformity of radiated power [formula omitted] (within a factor of 2) along the outer divertor leg, with peak heat flux on the divertor target reduced fourfold, was obtained. A comparison with 2-D fluid simulations shows good agreement when physical sputtering and an ad hoc chemical sputtering source (0.5%) from the private flux region surface are used.

KW - COMPUTERIZED SIMULATION

KW - DIVERTORS

KW - ELECTRON TEMPERATURE

KW - HEAT TRANSFER

KW - ION-ATOM COLLISIONS

KW - PLASMA DENSITY

KW - PLASMA DIAGNOSTICS

KW - PLASMA PRESSURE

KW - TOKAMAK DEVICES

UR - http://www.scopus.com/inward/record.url?scp=0000284540&partnerID=8YFLogxK

U2 - 10.1063/1.872278

DO - 10.1063/1.872278

M3 - Article

AN - SCOPUS:0000284540

SN - 1070-664X

VL - 4

SP - 1761

EP - 1773

JO - Physics of Plasmas

JF - Physics of Plasmas

IS - 5

ER -

The two-dimensional structure of radiative divertor plasmas in the DIII-D tokamak

Abstract

Keywords

UN SDGs

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