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. Snyder

E. J. Strait, S. Takeji, T. Takizuka, T. S. Taylor, A. D. Turnbull, K. Tsuchiya, M. R. Wade

Fusion and Fission Energy and Science Di

Research output: Contribution to journal › Article › peer-review

73 Scopus citations

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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