Physics of slow L-H transitions in the DIII-D tokamak

R. J. Colchin; B. A. Carreras; R. Maingi; L. R. Baylor; T. C. Jernigan; M. J. Schaffer; T. N. Carlstrom; N. H. Brooks; C. M. Greenfield; P. Gohil; G. R. McKee; D. L. Rudakov; T. L. Rhodes; E. J. Doyle; M. E. Austin; J. G. Watkins

doi:10.1088/0029-5515/42/9/312

Physics of slow L-H transitions in the DIII-D tokamak

R. J. Colchin, B. A. Carreras, R. Maingi, L. R. Baylor, T. C. Jernigan, M. J. Schaffer, T. N. Carlstrom, N. H. Brooks, C. M. Greenfield, P. Gohil, G. R. McKee, D. L. Rudakov, T. L. Rhodes, E. J. Doyle, M. E. Austin, J. G. Watkins

Fusion Energy Division

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Abstract

Details of the low-high (L-H) confinement transition are studied by a new technique which allows for an arbitrarily slow transition between the L- and H-modes on DIII-D. During the transition, the plasma is in an intermediate state (IM-mode) of temperature, density, confinement and edge shear flow. The IM-mode is characterized by periodic bursts of an edge instability, governed by relaxation oscillations, which evolve into type III edge localized modes (ELMs) as the neutral beam heating power is raised. An ELM-free H-mode is achieved when the edge pressure gradient is large enough to support shear flow sufficient to quell the IM-mode edge instability.

Original language	English
Pages (from-to)	1134-1143
Number of pages	10
Journal	Nuclear Fusion
Volume	42
Issue number	9
DOIs	https://doi.org/10.1088/0029-5515/42/9/312
State	Published - Sep 2002

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Colchin, R. J., Carreras, B. A., Maingi, R., Baylor, L. R., Jernigan, T. C., Schaffer, M. J., Carlstrom, T. N., Brooks, N. H., Greenfield, C. M., Gohil, P., McKee, G. R., Rudakov, D. L., Rhodes, T. L., Doyle, E. J., Austin, M. E., & Watkins, J. G. (2002). Physics of slow L-H transitions in the DIII-D tokamak. Nuclear Fusion, 42(9), 1134-1143. https://doi.org/10.1088/0029-5515/42/9/312

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title = "Physics of slow L-H transitions in the DIII-D tokamak",

abstract = "Details of the low-high (L-H) confinement transition are studied by a new technique which allows for an arbitrarily slow transition between the L- and H-modes on DIII-D. During the transition, the plasma is in an intermediate state (IM-mode) of temperature, density, confinement and edge shear flow. The IM-mode is characterized by periodic bursts of an edge instability, governed by relaxation oscillations, which evolve into type III edge localized modes (ELMs) as the neutral beam heating power is raised. An ELM-free H-mode is achieved when the edge pressure gradient is large enough to support shear flow sufficient to quell the IM-mode edge instability.",

author = "Colchin, {R. J.} and Carreras, {B. A.} and R. Maingi and Baylor, {L. R.} and Jernigan, {T. C.} and Schaffer, {M. J.} and Carlstrom, {T. N.} and Brooks, {N. H.} and Greenfield, {C. M.} and P. Gohil and McKee, {G. R.} and Rudakov, {D. L.} and Rhodes, {T. L.} and Doyle, {E. J.} and Austin, {M. E.} and Watkins, {J. G.}",

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doi = "10.1088/0029-5515/42/9/312",

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T1 - Physics of slow L-H transitions in the DIII-D tokamak

AU - Colchin, R. J.

AU - Carreras, B. A.

AU - Maingi, R.

AU - Baylor, L. R.

AU - Jernigan, T. C.

AU - Schaffer, M. J.

AU - Carlstrom, T. N.

AU - Brooks, N. H.

AU - Greenfield, C. M.

AU - Gohil, P.

AU - McKee, G. R.

AU - Rudakov, D. L.

AU - Rhodes, T. L.

AU - Doyle, E. J.

AU - Austin, M. E.

AU - Watkins, J. G.

PY - 2002/9

Y1 - 2002/9

N2 - Details of the low-high (L-H) confinement transition are studied by a new technique which allows for an arbitrarily slow transition between the L- and H-modes on DIII-D. During the transition, the plasma is in an intermediate state (IM-mode) of temperature, density, confinement and edge shear flow. The IM-mode is characterized by periodic bursts of an edge instability, governed by relaxation oscillations, which evolve into type III edge localized modes (ELMs) as the neutral beam heating power is raised. An ELM-free H-mode is achieved when the edge pressure gradient is large enough to support shear flow sufficient to quell the IM-mode edge instability.

AB - Details of the low-high (L-H) confinement transition are studied by a new technique which allows for an arbitrarily slow transition between the L- and H-modes on DIII-D. During the transition, the plasma is in an intermediate state (IM-mode) of temperature, density, confinement and edge shear flow. The IM-mode is characterized by periodic bursts of an edge instability, governed by relaxation oscillations, which evolve into type III edge localized modes (ELMs) as the neutral beam heating power is raised. An ELM-free H-mode is achieved when the edge pressure gradient is large enough to support shear flow sufficient to quell the IM-mode edge instability.

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DO - 10.1088/0029-5515/42/9/312

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AN - SCOPUS:18644379505

SN - 0029-5515

VL - 42

SP - 1134

EP - 1143

JO - Nuclear Fusion

JF - Nuclear Fusion

IS - 9

ER -

Physics of slow L-H transitions in the DIII-D tokamak

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