Helium exhaust studies in H-mode discharges in the DIII-D tokamak using an argon-frosted divertor cryopump

M. R. Wade; D. L. Hillis; J. T. Hogan; M. A. Mahdavi; R. Maingi; W. P. West; N. H. Brooks; K. H. Burrell; R. J. Groebner; G. L. Jackson; C. C. Klepper; G. Laughon; M. M. Menon; P. K. Mioduszewski

doi:10.1103/PhysRevLett.74.2702

Helium exhaust studies in H-mode discharges in the DIII-D tokamak using an argon-frosted divertor cryopump

M. R. Wade, D. L. Hillis, J. T. Hogan, M. A. Mahdavi, R. Maingi, W. P. West, N. H. Brooks, K. H. Burrell, R. J. Groebner, G. L. Jackson, C. C. Klepper, G. Laughon, M. M. Menon, P. K. Mioduszewski

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Abstract

The first experiments demonstrating exhaust of thermal helium in a diverted, H-mode deuterium plasma have been performed on the DIII-D tokamak. The helium, introduced via gas puffing, is observed to reach the plasma core, and then is readily removed form the plasma with a time constant of ∼10-20 energy-confinzement times by an in-vessel cryopump conditioned with argon frosting. Detailed analysis of the helium profile evolution suggests that the exhaust rate is limited by the exhaust efficiency of the pump (∼5%) and not by the intrinsic helium-transport properties of the plasma.

Original language	English
Pages (from-to)	2702-2705
Number of pages	4
Journal	Physical Review Letters
Volume	74
Issue number	14
DOIs	https://doi.org/10.1103/PhysRevLett.74.2702
State	Published - 1995

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Wade, M. R., Hillis, D. L., Hogan, J. T., Mahdavi, M. A., Maingi, R., West, W. P., Brooks, N. H., Burrell, K. H., Groebner, R. J., Jackson, G. L., Klepper, C. C., Laughon, G., Menon, M. M., & Mioduszewski, P. K. (1995). Helium exhaust studies in H-mode discharges in the DIII-D tokamak using an argon-frosted divertor cryopump. Physical Review Letters, 74(14), 2702-2705. https://doi.org/10.1103/PhysRevLett.74.2702

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title = "Helium exhaust studies in H-mode discharges in the DIII-D tokamak using an argon-frosted divertor cryopump",

abstract = "The first experiments demonstrating exhaust of thermal helium in a diverted, H-mode deuterium plasma have been performed on the DIII-D tokamak. The helium, introduced via gas puffing, is observed to reach the plasma core, and then is readily removed form the plasma with a time constant of ∼10-20 energy-confinzement times by an in-vessel cryopump conditioned with argon frosting. Detailed analysis of the helium profile evolution suggests that the exhaust rate is limited by the exhaust efficiency of the pump (∼5%) and not by the intrinsic helium-transport properties of the plasma.",

author = "Wade, {M. R.} and Hillis, {D. L.} and Hogan, {J. T.} and Mahdavi, {M. A.} and R. Maingi and West, {W. P.} and Brooks, {N. H.} and Burrell, {K. H.} and Groebner, {R. J.} and Jackson, {G. L.} and Klepper, {C. C.} and G. Laughon and Menon, {M. M.} and Mioduszewski, {P. K.}",

year = "1995",

doi = "10.1103/PhysRevLett.74.2702",

language = "English",

volume = "74",

pages = "2702--2705",

journal = "Physical Review Letters",

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Wade, MR, Hillis, DL, Hogan, JT, Mahdavi, MA, Maingi, R, West, WP, Brooks, NH, Burrell, KH, Groebner, RJ, Jackson, GL, Klepper, CC, Laughon, G, Menon, MM & Mioduszewski, PK 1995, 'Helium exhaust studies in H-mode discharges in the DIII-D tokamak using an argon-frosted divertor cryopump', Physical Review Letters, vol. 74, no. 14, pp. 2702-2705. https://doi.org/10.1103/PhysRevLett.74.2702

TY - JOUR

T1 - Helium exhaust studies in H-mode discharges in the DIII-D tokamak using an argon-frosted divertor cryopump

AU - Wade, M. R.

AU - Hillis, D. L.

AU - Hogan, J. T.

AU - Mahdavi, M. A.

AU - Maingi, R.

AU - West, W. P.

AU - Brooks, N. H.

AU - Burrell, K. H.

AU - Groebner, R. J.

AU - Jackson, G. L.

AU - Klepper, C. C.

AU - Laughon, G.

AU - Menon, M. M.

AU - Mioduszewski, P. K.

PY - 1995

Y1 - 1995

N2 - The first experiments demonstrating exhaust of thermal helium in a diverted, H-mode deuterium plasma have been performed on the DIII-D tokamak. The helium, introduced via gas puffing, is observed to reach the plasma core, and then is readily removed form the plasma with a time constant of ∼10-20 energy-confinzement times by an in-vessel cryopump conditioned with argon frosting. Detailed analysis of the helium profile evolution suggests that the exhaust rate is limited by the exhaust efficiency of the pump (∼5%) and not by the intrinsic helium-transport properties of the plasma.

AB - The first experiments demonstrating exhaust of thermal helium in a diverted, H-mode deuterium plasma have been performed on the DIII-D tokamak. The helium, introduced via gas puffing, is observed to reach the plasma core, and then is readily removed form the plasma with a time constant of ∼10-20 energy-confinzement times by an in-vessel cryopump conditioned with argon frosting. Detailed analysis of the helium profile evolution suggests that the exhaust rate is limited by the exhaust efficiency of the pump (∼5%) and not by the intrinsic helium-transport properties of the plasma.

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DO - 10.1103/PhysRevLett.74.2702

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VL - 74

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EP - 2705

JO - Physical Review Letters

JF - Physical Review Letters

IS - 14

ER -

Helium exhaust studies in H-mode discharges in the DIII-D tokamak using an argon-frosted divertor cryopump

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