Dependence of edge stability on plasma shape and local pressure gradients in the DIII-D and JT-60U tokamaks

L. L. Lao; Y. Kamada; T. Oikawa; L. R. Baylor; K. H. Burrell; V. S. Chan; M. S. Chance; M. S. Chu; J. R. Ferron; T. Fukuda; T. Hatae; A. Isayama; G. J. Jackson; A. W. Leonard; M. A. Makowski; J. Manickam; M. Murakami; M. Okabayashi; T. H. Osborne; P. B. Snyder; E. J. Strait; S. Takeji; T. Takizuka; T. S. Taylor; A. D. Turnbull; K. Tsuchiya; M. R. Wade

doi:10.1088/0029-5515/41/3/306

Dependence of edge stability on plasma shape and local pressure gradients in the DIII-D and JT-60U tokamaks

L. L. Lao, Y. Kamada, T. Oikawa, L. R. Baylor, K. H. Burrell, V. S. Chan, M. S. Chance, M. S. Chu, J. R. Ferron, T. Fukuda, T. Hatae, A. Isayama, G. J. Jackson, A. W. Leonard, M. A. Makowski, J. Manickam, M. Murakami, M. Okabayashi, T. H. Osborne, P. B. SnyderE. J. Strait, S. Takeji, T. Takizuka, T. S. Taylor, A. D. Turnbull, K. Tsuchiya, M. R. Wade

Fusion and Fission Energy and Science Di

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Abstract

The dependence of edge stability on plasma shape and local pressure gradients P′ in the DIII-D and JT-60U tokamaks is studied. The stronger plasma shaping in DIII-D allows the edge region of DIII-D discharges with type I (giant) ELMs to have access to the second region of stability for ideal ballooning modes and a larger edge pedestal pressure gradient P′ than JT-60U type I ELM discharges. These JT-60U discharges are near the ballooning mode first regime stability limit. The DIII-D results support an ideal stability based working model of type I ELMs as low to intermediate toroidal mode number, n, MHD modes. The results from a stability analysis of JT-60U type I ELM discharges indicate that the predictions of this model are also consistent with JT-60U edge stability observations.

Original language	English
Pages (from-to)	295-300
Number of pages	6
Journal	Nuclear Fusion
Volume	41
Issue number	3
DOIs	https://doi.org/10.1088/0029-5515/41/3/306
State	Published - Mar 2001

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Lao, L. L., Kamada, Y., Oikawa, T., Baylor, L. R., Burrell, K. H., Chan, V. S., Chance, M. S., Chu, M. S., Ferron, J. R., Fukuda, T., Hatae, T., Isayama, A., Jackson, G. J., Leonard, A. W., Makowski, M. A., Manickam, J., Murakami, M., Okabayashi, M., Osborne, T. H., ... Wade, M. R. (2001). Dependence of edge stability on plasma shape and local pressure gradients in the DIII-D and JT-60U tokamaks. Nuclear Fusion, 41(3), 295-300. https://doi.org/10.1088/0029-5515/41/3/306

@article{1e15fe94fe5645d58cc3ae9250fce875,

title = "Dependence of edge stability on plasma shape and local pressure gradients in the DIII-D and JT-60U tokamaks",

abstract = "The dependence of edge stability on plasma shape and local pressure gradients P′ in the DIII-D and JT-60U tokamaks is studied. The stronger plasma shaping in DIII-D allows the edge region of DIII-D discharges with type I (giant) ELMs to have access to the second region of stability for ideal ballooning modes and a larger edge pedestal pressure gradient P′ than JT-60U type I ELM discharges. These JT-60U discharges are near the ballooning mode first regime stability limit. The DIII-D results support an ideal stability based working model of type I ELMs as low to intermediate toroidal mode number, n, MHD modes. The results from a stability analysis of JT-60U type I ELM discharges indicate that the predictions of this model are also consistent with JT-60U edge stability observations.",

author = "Lao, \{L. L.\} and Y. Kamada and T. Oikawa and Baylor, \{L. R.\} and Burrell, \{K. H.\} and Chan, \{V. S.\} and Chance, \{M. S.\} and Chu, \{M. S.\} and Ferron, \{J. R.\} and T. Fukuda and T. Hatae and A. Isayama and Jackson, \{G. J.\} and Leonard, \{A. W.\} and Makowski, \{M. A.\} and J. Manickam and M. Murakami and M. Okabayashi and Osborne, \{T. H.\} and Snyder, \{P. B.\} and Strait, \{E. J.\} and S. Takeji and T. Takizuka and Taylor, \{T. S.\} and Turnbull, \{A. D.\} and K. Tsuchiya and Wade, \{M. R.\}",

year = "2001",

month = mar,

doi = "10.1088/0029-5515/41/3/306",

language = "English",

volume = "41",

pages = "295--300",

journal = "Nuclear Fusion",

issn = "0029-5515",

publisher = "IOP Publishing",

number = "3",

}

Lao, LL, Kamada, Y, Oikawa, T, Baylor, LR, Burrell, KH, Chan, VS, Chance, MS, Chu, MS, Ferron, JR, Fukuda, T, Hatae, T, Isayama, A, Jackson, GJ, Leonard, AW, Makowski, MA, Manickam, J, Murakami, M, Okabayashi, M, Osborne, TH, Snyder, PB, Strait, EJ, Takeji, S, Takizuka, T, Taylor, TS, Turnbull, AD, Tsuchiya, K & Wade, MR 2001, 'Dependence of edge stability on plasma shape and local pressure gradients in the DIII-D and JT-60U tokamaks', Nuclear Fusion, vol. 41, no. 3, pp. 295-300. https://doi.org/10.1088/0029-5515/41/3/306

TY - JOUR

T1 - Dependence of edge stability on plasma shape and local pressure gradients in the DIII-D and JT-60U tokamaks

AU - Lao, L. L.

AU - Kamada, Y.

AU - Oikawa, T.

AU - Baylor, L. R.

AU - Burrell, K. H.

AU - Chan, V. S.

AU - Chance, M. S.

AU - Chu, M. S.

AU - Ferron, J. R.

AU - Fukuda, T.

AU - Hatae, T.

AU - Isayama, A.

AU - Jackson, G. J.

AU - Leonard, A. W.

AU - Makowski, M. A.

AU - Manickam, J.

AU - Murakami, M.

AU - Okabayashi, M.

AU - Osborne, T. H.

AU - Snyder, P. B.

AU - Strait, E. J.

AU - Takeji, S.

AU - Takizuka, T.

AU - Taylor, T. S.

AU - Turnbull, A. D.

AU - Tsuchiya, K.

AU - Wade, M. R.

PY - 2001/3

Y1 - 2001/3

N2 - The dependence of edge stability on plasma shape and local pressure gradients P′ in the DIII-D and JT-60U tokamaks is studied. The stronger plasma shaping in DIII-D allows the edge region of DIII-D discharges with type I (giant) ELMs to have access to the second region of stability for ideal ballooning modes and a larger edge pedestal pressure gradient P′ than JT-60U type I ELM discharges. These JT-60U discharges are near the ballooning mode first regime stability limit. The DIII-D results support an ideal stability based working model of type I ELMs as low to intermediate toroidal mode number, n, MHD modes. The results from a stability analysis of JT-60U type I ELM discharges indicate that the predictions of this model are also consistent with JT-60U edge stability observations.

AB - The dependence of edge stability on plasma shape and local pressure gradients P′ in the DIII-D and JT-60U tokamaks is studied. The stronger plasma shaping in DIII-D allows the edge region of DIII-D discharges with type I (giant) ELMs to have access to the second region of stability for ideal ballooning modes and a larger edge pedestal pressure gradient P′ than JT-60U type I ELM discharges. These JT-60U discharges are near the ballooning mode first regime stability limit. The DIII-D results support an ideal stability based working model of type I ELMs as low to intermediate toroidal mode number, n, MHD modes. The results from a stability analysis of JT-60U type I ELM discharges indicate that the predictions of this model are also consistent with JT-60U edge stability observations.

UR - https://www.scopus.com/pages/publications/0035296950

U2 - 10.1088/0029-5515/41/3/306

DO - 10.1088/0029-5515/41/3/306

M3 - Article

AN - SCOPUS:0035296950

SN - 0029-5515

VL - 41

SP - 295

EP - 300

JO - Nuclear Fusion

JF - Nuclear Fusion

IS - 3

ER -

Dependence of edge stability on plasma shape and local pressure gradients in the DIII-D and JT-60U tokamaks

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