Characteristics of the first H-mode discharges in the National Spherical Torus Experiment -: art. no. 035003

被引:21
作者
Maingi, R [1 ]
Bell, MG
Bell, RE
Bush, CE
Fredrickson, ED
Gates, DA
Kaye, SM
Kugel, HW
LeBlanc, BP
Menard, JE
Mueller, D
Sabbagh, SA
Stutman, D
Taylor, G
Johnson, DW
Kaita, R
Maqueda, RJ
Ono, M
Paoletti, F
Paul, SF
Peng, YKM
Roquemore, AL
Skinner, CH
Soukhanovskii, VA
Synakowski, EJ
机构
[1] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA
[2] Princeton Plasma Phys Lab, Princeton, NJ 08543 USA
[3] Columbia Univ, New York, NY USA
[4] Johns Hopkins Univ, Baltimore, MD USA
[5] Los Alamos Natl Lab, Los Alamos, NM 87545 USA
关键词
D O I
10.1103/PhysRevB.88.035003
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We report observations of the first low-to-high (L-H) confinement mode transitions in the National Spherical Torus Experiment. The H-mode energy confinement time increased over reference discharges transiently by 100-200%, as high as similar to100 ms. This confinement time is similar to2 times higher than predicted by a multimachine scaling. Thus the confinement time of spherical tori has been extended to a record high value, leading to an eventual revision of confinement scalings. Finally, the power threshold for H-mode access is >10 X higher than predicted by an international scaling from conventional aspect-ratio tokamaks, which could lead to new understanding of H-mode transition dynamics.
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页数:4
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