Sustained high beta plasmas with negative central shear in DIII-D

A. M. Garofalo; E. J. Doyle; C. M. Greenfield; A. W. Hyatt; G. L. Jackson; R. J. Jayakumar; C. E. Kessel; J. Y. Kim; R. J. La Haye; M. Murakami; M. Okabayashi; H. Reimerdes; J. T. Scoville; H. E.St John; E. J. Strait

Sustained high beta plasmas with negative central shear in DIII-D

A. M. Garofalo
, E. J. Doyle
, C. M. Greenfield
, A. W. Hyatt
, G. L. Jackson
, R. J. Jayakumar
, C. E. Kessel
, J. Y. Kim
, R. J. La Haye
, M. Murakami
, M. Okabayashi
, H. Reimerdes
, J. T. Scoville
, H. E.St John
, E. J. Strait

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

Abstract

Simultaneous ramping of the plasma current and toroidal field, and application of early neutral beam heating in DIII-D have produced current-hole type discharges sustained for ≈2s at high values of normalized pressure (β_N≈ 4) and safety factor (q_min ≈ 2). The combination of internal transport barrier and negative central magnetic shear results in high energy confinement (H₈₉ > 2.5) and good bootstrap current alignment (f_BS ≈ 60%). Previously, stability limits in plasmas with core transport barriers have been observed at moderate values of β_N(<3) because of characteristically high pressure-peaking. A noninductive current fraction of ≈90% has been observed at plasma β ≈ 5% in these DIII-D experiments. Stability modeling shows the possibility for operation up to β ≈ 6%, suggesting a possible path to high fusion performance, steady-state tokamak scenarios with a large fraction of bootstrap current.

Original language	English
Title of host publication	32nd EPS Conference on Plasma Physics 2005, EPS 2005, Held with the 8th International Workshop on Fast Ignition of Fusion Targets - Europhysics Conference Abstracts
Pages	145-148
Number of pages	4
State	Published - 2005
Externally published	Yes
Event	32nd European Physical Society Conference on Plasma Physics and Controlled Fusion combined with the 8th International Workshop on Fast Ignition of Fusion Targets - Tarragona, Spain Duration: Jun 27 2005 → Jul 1 2005

Publication series

Name	32nd EPS Conference on Plasma Physics 2005, EPS 2005, Held with the 8th International Workshop on Fast Ignition of Fusion Targets - Europhysics Conference Abstracts
Volume	1

Conference

Conference	32nd European Physical Society Conference on Plasma Physics and Controlled Fusion combined with the 8th International Workshop on Fast Ignition of Fusion Targets
Country/Territory	Spain
City	Tarragona
Period	06/27/05 → 07/1/05

Cite this

Garofalo, A. M., Doyle, E. J., Greenfield, C. M., Hyatt, A. W., Jackson, G. L., Jayakumar, R. J., Kessel, C. E., Kim, J. Y., La Haye, R. J., Murakami, M., Okabayashi, M., Reimerdes, H., Scoville, J. T., John, H. E. S., & Strait, E. J. (2005). Sustained high beta plasmas with negative central shear in DIII-D. In 32nd EPS Conference on Plasma Physics 2005, EPS 2005, Held with the 8th International Workshop on Fast Ignition of Fusion Targets - Europhysics Conference Abstracts (pp. 145-148). (32nd EPS Conference on Plasma Physics 2005, EPS 2005, Held with the 8th International Workshop on Fast Ignition of Fusion Targets - Europhysics Conference Abstracts; Vol. 1).

Garofalo, A. M. ; Doyle, E. J. ; Greenfield, C. M. et al. / Sustained high beta plasmas with negative central shear in DIII-D. 32nd EPS Conference on Plasma Physics 2005, EPS 2005, Held with the 8th International Workshop on Fast Ignition of Fusion Targets - Europhysics Conference Abstracts. 2005. pp. 145-148 (32nd EPS Conference on Plasma Physics 2005, EPS 2005, Held with the 8th International Workshop on Fast Ignition of Fusion Targets - Europhysics Conference Abstracts).

@inproceedings{542a0b117dd543d8b1fdfee64ddc16bd,

title = "Sustained high beta plasmas with negative central shear in DIII-D",

abstract = "Simultaneous ramping of the plasma current and toroidal field, and application of early neutral beam heating in DIII-D have produced current-hole type discharges sustained for ≈2s at high values of normalized pressure (βN≈ 4) and safety factor (qmin ≈ 2). The combination of internal transport barrier and negative central magnetic shear results in high energy confinement (H89 > 2.5) and good bootstrap current alignment (fBS ≈ 60\%). Previously, stability limits in plasmas with core transport barriers have been observed at moderate values of βN(<3) because of characteristically high pressure-peaking. A noninductive current fraction of ≈90\% has been observed at plasma β ≈ 5\% in these DIII-D experiments. Stability modeling shows the possibility for operation up to β ≈ 6\%, suggesting a possible path to high fusion performance, steady-state tokamak scenarios with a large fraction of bootstrap current.",

author = "Garofalo, \{A. M.\} and Doyle, \{E. J.\} and Greenfield, \{C. M.\} and Hyatt, \{A. W.\} and Jackson, \{G. L.\} and Jayakumar, \{R. J.\} and Kessel, \{C. E.\} and Kim, \{J. Y.\} and \{La Haye\}, \{R. J.\} and M. Murakami and M. Okabayashi and H. Reimerdes and Scoville, \{J. T.\} and John, \{H. E.St\} and Strait, \{E. J.\}",

year = "2005",

language = "English",

isbn = "9781622763320",

series = "32nd EPS Conference on Plasma Physics 2005, EPS 2005, Held with the 8th International Workshop on Fast Ignition of Fusion Targets - Europhysics Conference Abstracts",

pages = "145--148",

booktitle = "32nd EPS Conference on Plasma Physics 2005, EPS 2005, Held with the 8th International Workshop on Fast Ignition of Fusion Targets - Europhysics Conference Abstracts",

note = "32nd European Physical Society Conference on Plasma Physics and Controlled Fusion combined with the 8th International Workshop on Fast Ignition of Fusion Targets ; Conference date: 27-06-2005 Through 01-07-2005",

}

Garofalo, AM, Doyle, EJ, Greenfield, CM, Hyatt, AW, Jackson, GL, Jayakumar, RJ, Kessel, CE, Kim, JY, La Haye, RJ, Murakami, M, Okabayashi, M, Reimerdes, H, Scoville, JT, John, HES & Strait, EJ 2005, Sustained high beta plasmas with negative central shear in DIII-D. in 32nd EPS Conference on Plasma Physics 2005, EPS 2005, Held with the 8th International Workshop on Fast Ignition of Fusion Targets - Europhysics Conference Abstracts. 32nd EPS Conference on Plasma Physics 2005, EPS 2005, Held with the 8th International Workshop on Fast Ignition of Fusion Targets - Europhysics Conference Abstracts, vol. 1, pp. 145-148, 32nd European Physical Society Conference on Plasma Physics and Controlled Fusion combined with the 8th International Workshop on Fast Ignition of Fusion Targets, Tarragona, Spain, 06/27/05.

Sustained high beta plasmas with negative central shear in DIII-D. / Garofalo, A. M.; Doyle, E. J.; Greenfield, C. M. et al.
32nd EPS Conference on Plasma Physics 2005, EPS 2005, Held with the 8th International Workshop on Fast Ignition of Fusion Targets - Europhysics Conference Abstracts. 2005. p. 145-148 (32nd EPS Conference on Plasma Physics 2005, EPS 2005, Held with the 8th International Workshop on Fast Ignition of Fusion Targets - Europhysics Conference Abstracts; Vol. 1).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

TY - GEN

T1 - Sustained high beta plasmas with negative central shear in DIII-D

AU - Garofalo, A. M.

AU - Doyle, E. J.

AU - Greenfield, C. M.

AU - Hyatt, A. W.

AU - Jackson, G. L.

AU - Jayakumar, R. J.

AU - Kessel, C. E.

AU - Kim, J. Y.

AU - La Haye, R. J.

AU - Murakami, M.

AU - Okabayashi, M.

AU - Reimerdes, H.

AU - Scoville, J. T.

AU - John, H. E.St

AU - Strait, E. J.

PY - 2005

Y1 - 2005

N2 - Simultaneous ramping of the plasma current and toroidal field, and application of early neutral beam heating in DIII-D have produced current-hole type discharges sustained for ≈2s at high values of normalized pressure (βN≈ 4) and safety factor (qmin ≈ 2). The combination of internal transport barrier and negative central magnetic shear results in high energy confinement (H89 > 2.5) and good bootstrap current alignment (fBS ≈ 60%). Previously, stability limits in plasmas with core transport barriers have been observed at moderate values of βN(<3) because of characteristically high pressure-peaking. A noninductive current fraction of ≈90% has been observed at plasma β ≈ 5% in these DIII-D experiments. Stability modeling shows the possibility for operation up to β ≈ 6%, suggesting a possible path to high fusion performance, steady-state tokamak scenarios with a large fraction of bootstrap current.

AB - Simultaneous ramping of the plasma current and toroidal field, and application of early neutral beam heating in DIII-D have produced current-hole type discharges sustained for ≈2s at high values of normalized pressure (βN≈ 4) and safety factor (qmin ≈ 2). The combination of internal transport barrier and negative central magnetic shear results in high energy confinement (H89 > 2.5) and good bootstrap current alignment (fBS ≈ 60%). Previously, stability limits in plasmas with core transport barriers have been observed at moderate values of βN(<3) because of characteristically high pressure-peaking. A noninductive current fraction of ≈90% has been observed at plasma β ≈ 5% in these DIII-D experiments. Stability modeling shows the possibility for operation up to β ≈ 6%, suggesting a possible path to high fusion performance, steady-state tokamak scenarios with a large fraction of bootstrap current.

UR - https://www.scopus.com/pages/publications/84873373705

M3 - Conference contribution

AN - SCOPUS:84873373705

SN - 9781622763320

T3 - 32nd EPS Conference on Plasma Physics 2005, EPS 2005, Held with the 8th International Workshop on Fast Ignition of Fusion Targets - Europhysics Conference Abstracts

SP - 145

EP - 148

BT - 32nd EPS Conference on Plasma Physics 2005, EPS 2005, Held with the 8th International Workshop on Fast Ignition of Fusion Targets - Europhysics Conference Abstracts

T2 - 32nd European Physical Society Conference on Plasma Physics and Controlled Fusion combined with the 8th International Workshop on Fast Ignition of Fusion Targets

Y2 - 27 June 2005 through 1 July 2005

ER -

Garofalo AM, Doyle EJ, Greenfield CM, Hyatt AW, Jackson GL, Jayakumar RJ et al. Sustained high beta plasmas with negative central shear in DIII-D. In 32nd EPS Conference on Plasma Physics 2005, EPS 2005, Held with the 8th International Workshop on Fast Ignition of Fusion Targets - Europhysics Conference Abstracts. 2005. p. 145-148. (32nd EPS Conference on Plasma Physics 2005, EPS 2005, Held with the 8th International Workshop on Fast Ignition of Fusion Targets - Europhysics Conference Abstracts).

Sustained high beta plasmas with negative central shear in DIII-D

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