Comparisons of small ELM H-Mode regimes on the Alcator C-Mod and JFT-2M tokamaks

A. E. Hubbard; K. Kamiya; N. Oyama; N. Basse; T. Biewer; E. Edlund; J. W. Hughes; L. Lin; M. Porkolab; W. Rowan; J. Snipes; J. Terry; S. M. Wolfe

doi:10.1088/0741-3335/48/5A/S11

Comparisons of small ELM H-Mode regimes on the Alcator C-Mod and JFT-2M tokamaks

A. E. Hubbard, K. Kamiya, N. Oyama, N. Basse, T. Biewer, E. Edlund, J. W. Hughes, L. Lin, M. Porkolab, W. Rowan, J. Snipes, J. Terry, S. M. Wolfe

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Abstract

Comparisons of H-mode regimes were carried out on the Alcator C-Mod and JFT-2M tokamaks. Shapes were matched apart from aspect ratio, which is lower on C-Mod. The high recycling steady H-mode on JFT-2M and enhanced D-alpha (EDA) regime on C-Mod, both of which feature very small or no ELMs, are found to have similar access conditions in q₉₅ - ν* space, occurring for pedestal collisionality ν* ≳ 1. Differences in edge fluctuations were found, with lower frequencies but higher mode numbers on C-Mod. In both tokamaks an attractive regime with small ELMs on top of an enhanced D _α baseline was obtained at moderate ν* and higher pressure. The JFT-2M shape favoured the appearance of ELMs on C-Mod and also resulted in the appearance of a lower frequency component of the quasicoherent mode during EDA.

Original language	English
Pages (from-to)	A121-A129
Journal	Plasma Physics and Controlled Fusion
Volume	48
Issue number	5 A
DOIs	https://doi.org/10.1088/0741-3335/48/5A/S11
State	Published - May 2006
Externally published	Yes

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title = "Comparisons of small ELM H-Mode regimes on the Alcator C-Mod and JFT-2M tokamaks",

abstract = "Comparisons of H-mode regimes were carried out on the Alcator C-Mod and JFT-2M tokamaks. Shapes were matched apart from aspect ratio, which is lower on C-Mod. The high recycling steady H-mode on JFT-2M and enhanced D-alpha (EDA) regime on C-Mod, both of which feature very small or no ELMs, are found to have similar access conditions in q95 - ν* space, occurring for pedestal collisionality ν* ≳ 1. Differences in edge fluctuations were found, with lower frequencies but higher mode numbers on C-Mod. In both tokamaks an attractive regime with small ELMs on top of an enhanced D α baseline was obtained at moderate ν* and higher pressure. The JFT-2M shape favoured the appearance of ELMs on C-Mod and also resulted in the appearance of a lower frequency component of the quasicoherent mode during EDA.",

author = "Hubbard, {A. E.} and K. Kamiya and N. Oyama and N. Basse and T. Biewer and E. Edlund and Hughes, {J. W.} and L. Lin and M. Porkolab and W. Rowan and J. Snipes and J. Terry and Wolfe, {S. M.}",

year = "2006",

month = may,

doi = "10.1088/0741-3335/48/5A/S11",

language = "English",

volume = "48",

pages = "A121--A129",

journal = "Plasma Physics and Controlled Fusion",

issn = "0741-3335",

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T1 - Comparisons of small ELM H-Mode regimes on the Alcator C-Mod and JFT-2M tokamaks

AU - Hubbard, A. E.

AU - Kamiya, K.

AU - Oyama, N.

AU - Basse, N.

AU - Biewer, T.

AU - Edlund, E.

AU - Hughes, J. W.

AU - Lin, L.

AU - Porkolab, M.

AU - Rowan, W.

AU - Snipes, J.

AU - Terry, J.

AU - Wolfe, S. M.

PY - 2006/5

Y1 - 2006/5

N2 - Comparisons of H-mode regimes were carried out on the Alcator C-Mod and JFT-2M tokamaks. Shapes were matched apart from aspect ratio, which is lower on C-Mod. The high recycling steady H-mode on JFT-2M and enhanced D-alpha (EDA) regime on C-Mod, both of which feature very small or no ELMs, are found to have similar access conditions in q95 - ν* space, occurring for pedestal collisionality ν* ≳ 1. Differences in edge fluctuations were found, with lower frequencies but higher mode numbers on C-Mod. In both tokamaks an attractive regime with small ELMs on top of an enhanced D α baseline was obtained at moderate ν* and higher pressure. The JFT-2M shape favoured the appearance of ELMs on C-Mod and also resulted in the appearance of a lower frequency component of the quasicoherent mode during EDA.

AB - Comparisons of H-mode regimes were carried out on the Alcator C-Mod and JFT-2M tokamaks. Shapes were matched apart from aspect ratio, which is lower on C-Mod. The high recycling steady H-mode on JFT-2M and enhanced D-alpha (EDA) regime on C-Mod, both of which feature very small or no ELMs, are found to have similar access conditions in q95 - ν* space, occurring for pedestal collisionality ν* ≳ 1. Differences in edge fluctuations were found, with lower frequencies but higher mode numbers on C-Mod. In both tokamaks an attractive regime with small ELMs on top of an enhanced D α baseline was obtained at moderate ν* and higher pressure. The JFT-2M shape favoured the appearance of ELMs on C-Mod and also resulted in the appearance of a lower frequency component of the quasicoherent mode during EDA.

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U2 - 10.1088/0741-3335/48/5A/S11

DO - 10.1088/0741-3335/48/5A/S11

M3 - Article

AN - SCOPUS:34248139669

SN - 0741-3335

VL - 48

SP - A121-A129

JO - Plasma Physics and Controlled Fusion

JF - Plasma Physics and Controlled Fusion

IS - 5 A

ER -

Comparisons of small ELM H-Mode regimes on the Alcator C-Mod and JFT-2M tokamaks

Abstract

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