Helium transport and exhaust studies in enhanced confinement regimes in DIII-D

M. R. Wade; D. L. Hillis; J. T. Hogan; R. Maingi; M. M. Menon; M. A. Mahdavi; W. P. West; K. H. Burrell; R. Gohil; R. J. Groebner; R. M. Hong; D. H. Kellman; J. C. Phillips; R. R. Seraydarian; D. F. Finkenthal

doi:10.1063/1.871489

Helium transport and exhaust studies in enhanced confinement regimes in DIII-D

M. R. Wade, D. L. Hillis, J. T. Hogan, R. Maingi, M. M. Menon, M. A. Mahdavi, W. P. West, K. H. Burrell, R. Gohil, R. J. Groebner, R. M. Hong, D. H. Kellman, J. C. Phillips, R. R. Seraydarian, D. F. Finkenthal

Fusion and Fission Energy and Science Di

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Abstract

A better understanding of helium transport in the plasma core and edge in enhanced confinement regimes is now emerging from recent experimental studies on DIII-D [Plasma Physics and Controlled Fusion Research (International Atomic Energy Agency, Vienna, 1986), p. 159]. Overall, the results are encouraging. Significant helium exhaust (τ*^He/τ_E ∼ 11) has been obtained in a diverted, H-mode plasma with edge-localized modes (ELM's) simultaneous with a central source of helium. There is no evidence of central peaking of the helium density profile even in the presence of this central source. Detailed analysis of the helium profile evolution indicates 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. Perturbative helium transport studies using gas puffing have shown that D_He/ χ_eff ∼1 in all confinement regimes studied to date (including H mode and VH mode). Furthermore, there is no evidence of preferential accumulation of helium in any of these regimes.

Original language	English
Pages (from-to)	2357-2365
Number of pages	9
Journal	Physics of Plasmas
Volume	2
Issue number	6
DOIs	https://doi.org/10.1063/1.871489
State	Published - 1995

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Wade, M. R., Hillis, D. L., Hogan, J. T., Maingi, R., Menon, M. M., Mahdavi, M. A., West, W. P., Burrell, K. H., Gohil, R., Groebner, R. J., Hong, R. M., Kellman, D. H., Phillips, J. C., Seraydarian, R. R., & Finkenthal, D. F. (1995). Helium transport and exhaust studies in enhanced confinement regimes in DIII-D. Physics of Plasmas, 2(6), 2357-2365. https://doi.org/10.1063/1.871489

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title = "Helium transport and exhaust studies in enhanced confinement regimes in DIII-D",

abstract = "A better understanding of helium transport in the plasma core and edge in enhanced confinement regimes is now emerging from recent experimental studies on DIII-D [Plasma Physics and Controlled Fusion Research (International Atomic Energy Agency, Vienna, 1986), p. 159]. Overall, the results are encouraging. Significant helium exhaust (τ*He/τE ∼ 11) has been obtained in a diverted, H-mode plasma with edge-localized modes (ELM's) simultaneous with a central source of helium. There is no evidence of central peaking of the helium density profile even in the presence of this central source. Detailed analysis of the helium profile evolution indicates 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. Perturbative helium transport studies using gas puffing have shown that DHe/ χeff ∼1 in all confinement regimes studied to date (including H mode and VH mode). Furthermore, there is no evidence of preferential accumulation of helium in any of these regimes.",

author = "Wade, {M. R.} and Hillis, {D. L.} and Hogan, {J. T.} and R. Maingi and Menon, {M. M.} and Mahdavi, {M. A.} and West, {W. P.} and Burrell, {K. H.} and R. Gohil and Groebner, {R. J.} and Hong, {R. M.} and Kellman, {D. H.} and Phillips, {J. C.} and Seraydarian, {R. R.} and Finkenthal, {D. F.}",

year = "1995",

doi = "10.1063/1.871489",

language = "English",

volume = "2",

pages = "2357--2365",

journal = "Physics of Plasmas",

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T1 - Helium transport and exhaust studies in enhanced confinement regimes in DIII-D

AU - Wade, M. R.

AU - Hillis, D. L.

AU - Hogan, J. T.

AU - Maingi, R.

AU - Menon, M. M.

AU - Mahdavi, M. A.

AU - West, W. P.

AU - Burrell, K. H.

AU - Gohil, R.

AU - Groebner, R. J.

AU - Hong, R. M.

AU - Kellman, D. H.

AU - Phillips, J. C.

AU - Seraydarian, R. R.

AU - Finkenthal, D. F.

PY - 1995

Y1 - 1995

N2 - A better understanding of helium transport in the plasma core and edge in enhanced confinement regimes is now emerging from recent experimental studies on DIII-D [Plasma Physics and Controlled Fusion Research (International Atomic Energy Agency, Vienna, 1986), p. 159]. Overall, the results are encouraging. Significant helium exhaust (τ*He/τE ∼ 11) has been obtained in a diverted, H-mode plasma with edge-localized modes (ELM's) simultaneous with a central source of helium. There is no evidence of central peaking of the helium density profile even in the presence of this central source. Detailed analysis of the helium profile evolution indicates 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. Perturbative helium transport studies using gas puffing have shown that DHe/ χeff ∼1 in all confinement regimes studied to date (including H mode and VH mode). Furthermore, there is no evidence of preferential accumulation of helium in any of these regimes.

AB - A better understanding of helium transport in the plasma core and edge in enhanced confinement regimes is now emerging from recent experimental studies on DIII-D [Plasma Physics and Controlled Fusion Research (International Atomic Energy Agency, Vienna, 1986), p. 159]. Overall, the results are encouraging. Significant helium exhaust (τ*He/τE ∼ 11) has been obtained in a diverted, H-mode plasma with edge-localized modes (ELM's) simultaneous with a central source of helium. There is no evidence of central peaking of the helium density profile even in the presence of this central source. Detailed analysis of the helium profile evolution indicates 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. Perturbative helium transport studies using gas puffing have shown that DHe/ χeff ∼1 in all confinement regimes studied to date (including H mode and VH mode). Furthermore, there is no evidence of preferential accumulation of helium in any of these regimes.

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Helium transport and exhaust studies in enhanced confinement regimes in DIII-D

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