Understanding and control of transport in Advanced Tokamak regimes in DIII-D

DIII-D Team

doi:10.1063/1.874176

Understanding and control of transport in Advanced Tokamak regimes in DIII-D

DIII-D Team

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Abstract

Transport phenomena are studied in Advanced Tokamak (AT) regimes in the DIII-D tokamak [Plasma Physics and Controlled Nuclear Fusion Research, 1986 (International Atomics Energy Agency, Vienna, 1987), Vol. I, p. 159], with the goal of developing understanding and control during each of three phases: Formation of the internal transport barrier (ITB) with counter neutral beam injection taking place when the heating power exceeds a threshold value of about 9 MW, contrasting to co-NBI injection, where [formula omitted] Expansion of the ITB is enhanced compared to similar co-injected discharges. Both differences are believed to arise from modification of the [formula omitted] shear dynamics when the sign of the rotation contribution is reversed. Sustainment of an AT regime with [formula omitted] for 16 confinement times has been accomplished in a discharge combining an ELMing H-mode (edge localized, high confinement mode) edge and an ITB, and exhibiting ion thermal transport down to 2–3 times neoclassical. The microinstabilities usually associated with ion thermal transport are predicted stable, implying that another mechanism limits performance. High frequency magnetohydrodynamic (MHD) activity is identified as the probable cause.

Original language	English
Pages (from-to)	1959-1967
Number of pages	9
Journal	Physics of Plasmas
Volume	7
Issue number	5
DOIs	https://doi.org/10.1063/1.874176
State	Published - May 2000
Externally published	Yes

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10.1063/1.874176

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@article{75bc5f0cc25e4da9a56f90d57b3acd73,

title = "Understanding and control of transport in Advanced Tokamak regimes in DIII-D",

abstract = "Transport phenomena are studied in Advanced Tokamak (AT) regimes in the DIII-D tokamak [Plasma Physics and Controlled Nuclear Fusion Research, 1986 (International Atomics Energy Agency, Vienna, 1987), Vol. I, p. 159], with the goal of developing understanding and control during each of three phases: Formation of the internal transport barrier (ITB) with counter neutral beam injection taking place when the heating power exceeds a threshold value of about 9 MW, contrasting to co-NBI injection, where [formula omitted] Expansion of the ITB is enhanced compared to similar co-injected discharges. Both differences are believed to arise from modification of the [formula omitted] shear dynamics when the sign of the rotation contribution is reversed. Sustainment of an AT regime with [formula omitted] for 16 confinement times has been accomplished in a discharge combining an ELMing H-mode (edge localized, high confinement mode) edge and an ITB, and exhibiting ion thermal transport down to 2–3 times neoclassical. The microinstabilities usually associated with ion thermal transport are predicted stable, implying that another mechanism limits performance. High frequency magnetohydrodynamic (MHD) activity is identified as the probable cause.",

author = "{DIII-D Team} and Greenfield, {C. M.} and Deboo, {J. C.} and Luce, {T. C.} and Stallard, {B. W.} and Synakowski, {E. J.} and Baylor, {L. R.} and Burrell, {K. H.} and Casper, {T. A.} and Doyle, {E. J.} and Ernst, {D. R.} and Ferron, {J. R.} and P. Gohil and Groebner, {R. J.} and Lao, {L. L.} and M. Makowski and Mckee, {G. R.} and M. Murakami and Petty, {C. C.} and Pinsker, {R. I.} and Politzer, {P. A.} and R. Prater and Rettig, {C. L.} and Rhodes, {T. L.} and Rice, {B. W.} and Schmidt, {G. L.} and Staebler, {G. M.} and Strait, {E. J.} and Thomas, {D. M.} and Wade, {M. R.}",

year = "2000",

month = may,

doi = "10.1063/1.874176",

language = "English",

volume = "7",

pages = "1959--1967",

journal = "Physics of Plasmas",

issn = "1070-664X",

publisher = "American Institute of Physics",

number = "5",

}

TY - JOUR

T1 - Understanding and control of transport in Advanced Tokamak regimes in DIII-D

AU - DIII-D Team

AU - Greenfield, C. M.

AU - Deboo, J. C.

AU - Luce, T. C.

AU - Stallard, B. W.

AU - Synakowski, E. J.

AU - Baylor, L. R.

AU - Burrell, K. H.

AU - Casper, T. A.

AU - Doyle, E. J.

AU - Ernst, D. R.

AU - Ferron, J. R.

AU - Gohil, P.

AU - Groebner, R. J.

AU - Lao, L. L.

AU - Makowski, M.

AU - Mckee, G. R.

AU - Murakami, M.

AU - Petty, C. C.

AU - Pinsker, R. I.

AU - Politzer, P. A.

AU - Prater, R.

AU - Rettig, C. L.

AU - Rhodes, T. L.

AU - Rice, B. W.

AU - Schmidt, G. L.

AU - Staebler, G. M.

AU - Strait, E. J.

AU - Thomas, D. M.

AU - Wade, M. R.

PY - 2000/5

Y1 - 2000/5

N2 - Transport phenomena are studied in Advanced Tokamak (AT) regimes in the DIII-D tokamak [Plasma Physics and Controlled Nuclear Fusion Research, 1986 (International Atomics Energy Agency, Vienna, 1987), Vol. I, p. 159], with the goal of developing understanding and control during each of three phases: Formation of the internal transport barrier (ITB) with counter neutral beam injection taking place when the heating power exceeds a threshold value of about 9 MW, contrasting to co-NBI injection, where [formula omitted] Expansion of the ITB is enhanced compared to similar co-injected discharges. Both differences are believed to arise from modification of the [formula omitted] shear dynamics when the sign of the rotation contribution is reversed. Sustainment of an AT regime with [formula omitted] for 16 confinement times has been accomplished in a discharge combining an ELMing H-mode (edge localized, high confinement mode) edge and an ITB, and exhibiting ion thermal transport down to 2–3 times neoclassical. The microinstabilities usually associated with ion thermal transport are predicted stable, implying that another mechanism limits performance. High frequency magnetohydrodynamic (MHD) activity is identified as the probable cause.

AB - Transport phenomena are studied in Advanced Tokamak (AT) regimes in the DIII-D tokamak [Plasma Physics and Controlled Nuclear Fusion Research, 1986 (International Atomics Energy Agency, Vienna, 1987), Vol. I, p. 159], with the goal of developing understanding and control during each of three phases: Formation of the internal transport barrier (ITB) with counter neutral beam injection taking place when the heating power exceeds a threshold value of about 9 MW, contrasting to co-NBI injection, where [formula omitted] Expansion of the ITB is enhanced compared to similar co-injected discharges. Both differences are believed to arise from modification of the [formula omitted] shear dynamics when the sign of the rotation contribution is reversed. Sustainment of an AT regime with [formula omitted] for 16 confinement times has been accomplished in a discharge combining an ELMing H-mode (edge localized, high confinement mode) edge and an ITB, and exhibiting ion thermal transport down to 2–3 times neoclassical. The microinstabilities usually associated with ion thermal transport are predicted stable, implying that another mechanism limits performance. High frequency magnetohydrodynamic (MHD) activity is identified as the probable cause.

UR - http://www.scopus.com/inward/record.url?scp=0000996193&partnerID=8YFLogxK

U2 - 10.1063/1.874176

DO - 10.1063/1.874176

M3 - Article

AN - SCOPUS:0000996193

SN - 1070-664X

VL - 7

SP - 1959

EP - 1967

JO - Physics of Plasmas

JF - Physics of Plasmas

IS - 5

ER -

Understanding and control of transport in Advanced Tokamak regimes in DIII-D

Abstract

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