Very high confinement discharges in DIII-D after boronization

G. L. Jackson; J. Winter; T. S. Taylor; C. M. Greenfield; K. H. Burrell; T. N. Carlstrom; J. C. DeBoo; E. J. Doyle; R. J. Groebner; L. L. Lao; C. Rettig; D. P. Schissel; E. J. Strait

doi:10.1063/1.860485

Very high confinement discharges in DIII-D after boronization

G. L. Jackson, J. Winter, T. S. Taylor, C. M. Greenfield, K. H. Burrell, T. N. Carlstrom, J. C. DeBoo, E. J. Doyle, R. J. Groebner, L. L. Lao, C. Rettig, D. P. Schissel, E. J. Strait

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Abstract

A regime of very high confinement (VH mode) has recently been observed in DIII-D with global energy confinement times up to a factor of 3.5 above the ITER89-P L-mode scaling [Nucl. Fusion 30, 1999 (1990)] and 1.5 to 2 times greater than the DIII-D/JET edge-localized-mode-free H-mode scaling relation [Nucl. Fusion 31, 73 (1991)]. These discharges were obtained after boronization in DIII-D and are characterized by low radiated power and Z_eff, increasing confinement time during the VH phase of the discharge and low Ohmic target density. The low radiated power and Z_eff are a consequence of the boronization. During the VH phase these discharges exhibit an inward shift in the region of highest electric field shear and a large calculated edge bootstrap current. The outer region (ρ≳0.85) is calculated to be in the second stable regime to ideal ballooning modes.

Original language	English
Pages (from-to)	2181-2188
Number of pages	8
Journal	Physics of Fluids B
Volume	4
Issue number	7
DOIs	https://doi.org/10.1063/1.860485
State	Published - 1992
Externally published	Yes

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@article{3147df353316476d89990d6c41287713,

title = "Very high confinement discharges in DIII-D after boronization",

abstract = "A regime of very high confinement (VH mode) has recently been observed in DIII-D with global energy confinement times up to a factor of 3.5 above the ITER89-P L-mode scaling [Nucl. Fusion 30, 1999 (1990)] and 1.5 to 2 times greater than the DIII-D/JET edge-localized-mode-free H-mode scaling relation [Nucl. Fusion 31, 73 (1991)]. These discharges were obtained after boronization in DIII-D and are characterized by low radiated power and Zeff, increasing confinement time during the VH phase of the discharge and low Ohmic target density. The low radiated power and Zeff are a consequence of the boronization. During the VH phase these discharges exhibit an inward shift in the region of highest electric field shear and a large calculated edge bootstrap current. The outer region (ρ≳0.85) is calculated to be in the second stable regime to ideal ballooning modes.",

author = "Jackson, {G. L.} and J. Winter and Taylor, {T. S.} and Greenfield, {C. M.} and Burrell, {K. H.} and Carlstrom, {T. N.} and DeBoo, {J. C.} and Doyle, {E. J.} and Groebner, {R. J.} and Lao, {L. L.} and C. Rettig and Schissel, {D. P.} and Strait, {E. J.}",

year = "1992",

doi = "10.1063/1.860485",

language = "English",

volume = "4",

pages = "2181--2188",

journal = "Physics of Fluids B",

issn = "0899-8221",

number = "7",

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TY - JOUR

T1 - Very high confinement discharges in DIII-D after boronization

AU - Jackson, G. L.

AU - Winter, J.

AU - Taylor, T. S.

AU - Greenfield, C. M.

AU - Burrell, K. H.

AU - Carlstrom, T. N.

AU - DeBoo, J. C.

AU - Doyle, E. J.

AU - Groebner, R. J.

AU - Lao, L. L.

AU - Rettig, C.

AU - Schissel, D. P.

AU - Strait, E. J.

PY - 1992

Y1 - 1992

N2 - A regime of very high confinement (VH mode) has recently been observed in DIII-D with global energy confinement times up to a factor of 3.5 above the ITER89-P L-mode scaling [Nucl. Fusion 30, 1999 (1990)] and 1.5 to 2 times greater than the DIII-D/JET edge-localized-mode-free H-mode scaling relation [Nucl. Fusion 31, 73 (1991)]. These discharges were obtained after boronization in DIII-D and are characterized by low radiated power and Zeff, increasing confinement time during the VH phase of the discharge and low Ohmic target density. The low radiated power and Zeff are a consequence of the boronization. During the VH phase these discharges exhibit an inward shift in the region of highest electric field shear and a large calculated edge bootstrap current. The outer region (ρ≳0.85) is calculated to be in the second stable regime to ideal ballooning modes.

AB - A regime of very high confinement (VH mode) has recently been observed in DIII-D with global energy confinement times up to a factor of 3.5 above the ITER89-P L-mode scaling [Nucl. Fusion 30, 1999 (1990)] and 1.5 to 2 times greater than the DIII-D/JET edge-localized-mode-free H-mode scaling relation [Nucl. Fusion 31, 73 (1991)]. These discharges were obtained after boronization in DIII-D and are characterized by low radiated power and Zeff, increasing confinement time during the VH phase of the discharge and low Ohmic target density. The low radiated power and Zeff are a consequence of the boronization. During the VH phase these discharges exhibit an inward shift in the region of highest electric field shear and a large calculated edge bootstrap current. The outer region (ρ≳0.85) is calculated to be in the second stable regime to ideal ballooning modes.

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U2 - 10.1063/1.860485

DO - 10.1063/1.860485

M3 - Article

AN - SCOPUS:29744450573

SN - 0899-8221

VL - 4

SP - 2181

EP - 2188

JO - Physics of Fluids B

JF - Physics of Fluids B

IS - 7

ER -

Very high confinement discharges in DIII-D after boronization

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