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Maingi R, Bell MG, Bell RE, et al. Characteristics of the first H-mode discharges in the national spherical torus experiment. Phys Rev Lett. 2002;88(3):035003doi: 10.1103/PhysRevLett.88.035003.
Maingi, R., Bell, M. G., Bell, R. E., Bush, C. E., Fredrickson, E. D., Gates, D. A., Kaye, S. M., Kugel, H. W., LeBlanc, B. P., Menard, J. E., Mueller, D., Sabbagh, S. A., Stutman, D., Taylor, G., Johnson, D. W., Kaita, R., Maqueda, R. J., Ono, M., Paoletti, F., Paul, S. F., Peng, Y. K., Roquemore, A. L., Skinner, C. H., Soukhanovskii, V. A., & Synakowski, E. J. (2002). Characteristics of the first H-mode discharges in the national spherical torus experiment. Physical review letters, 88(3), 035003. https://doi.org/10.1103/PhysRevLett.88.035003
Maingi, R, et al. "Characteristics of the first H-mode discharges in the national spherical torus experiment." Physical review letters vol. 88,3 (2002): 035003. doi: https://doi.org/10.1103/PhysRevLett.88.035003
Maingi R, 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 YK, Roquemore AL, Skinner CH, Soukhanovskii VA, Synakowski EJ. Characteristics of the first H-mode discharges in the national spherical torus experiment. Phys Rev Lett. 2002 Jan 21;88(3):035003. doi: 10.1103/PhysRevLett.88.035003. Epub 2002 Jan 03. PMID: 11801067.
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Phys Rev Lett. 2002 Jan 21;88(3):035003. doi: 10.1103/PhysRevLett.88.035003. Epub 2002 Jan 03.

Characteristics of the first H-mode discharges in the national spherical torus experiment.

Physical review letters

R Maingi, M G Bell, R E Bell, C E Bush, E D Fredrickson, D A Gates, S M Kaye, H W Kugel, B P LeBlanc, J E Menard, D Mueller, S A Sabbagh, D Stutman, G Taylor, D W Johnson, R Kaita, R J Maqueda, M Ono, F Paoletti, S F Paul, Y-K M Peng, A L Roquemore, C H Skinner, V A Soukhanovskii, E J Synakowski

Affiliations

  1. Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.

PMID: 11801067 DOI: 10.1103/PhysRevLett.88.035003

Abstract

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 approximately 100 ms. This confinement time is approximately 2 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 >10x 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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