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Title: Characteristics of the First H-mode Discharges in NSTX

Abstract

We report observations of the first low-to-high (L-H) confinement mode transitions in the National Spherical Torus Experiment (NSTX). The H-mode energy confinement time increased over reference L-mode discharges transiently by 100-300%, as high as {approximately}150 ms. This confinement time is {approximately}1.8-2.3 times higher than predicted by a multi-machine ELM-free H-mode scaling. This achievement extends the H-mode window of fusion devices down to a record low aspect ratio (R/a) {approximately} 1.3, challenging both confinement and L-H power thresholds scalings based on conventional aspect ratio tokamaks.

Authors:
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Publication Date:
Research Org.:
Princeton Plasma Physics Lab., NJ (US)
Sponsoring Org.:
USDOE Office of Energy Research (ER) (US)
OSTI Identifier:
784549
Report Number(s):
PPPL-3563
TRN: US0106114
DOE Contract Number:  
AC02-76CH03073
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 10 May 2001
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; NSTX DEVICE; H-MODE PLASMA CONFINEMENT; ASPECT RATIO; L-MODE PLASMA CONFINEMENT; MODE CONVERSION; CONFINEMENT TIME

Citation Formats

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., Peng, Y-K.M., Roquemore, A.L., Skinner, C.H., Soukhanovskii, V.A., and and Synakowski, E.J. Characteristics of the First H-mode Discharges in NSTX. United States: N. p., 2001. Web. doi:10.2172/784549.
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., Peng, Y-K.M., Roquemore, A.L., Skinner, C.H., Soukhanovskii, V.A., & and Synakowski, E.J. Characteristics of the First H-mode Discharges in NSTX. United States. doi:10.2172/784549.
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., Peng, Y-K.M., Roquemore, A.L., Skinner, C.H., Soukhanovskii, V.A., and and Synakowski, E.J. Thu . "Characteristics of the First H-mode Discharges in NSTX". United States. doi:10.2172/784549. https://www.osti.gov/servlets/purl/784549.
@article{osti_784549,
title = {Characteristics of the First H-mode Discharges in NSTX},
author = {Maingi, R. and Bell, M.G. and Bell, R.E. and Bush, C.E. and Fredrickson, E.D. and Gates, D.A. and Kaye, S.M. and Kugel, H.W. and LeBlanc, B.P. and Menard, J.E. and Mueller, D. and Sabbagh, S.A. and Stutman, D. and Taylor, G. and Johnson, D.W. and Kaita, R. and Maqueda, R.J. and Ono, M. and Paoletti, F. and Peng, Y-K.M. and Roquemore, A.L. and Skinner, C.H. and Soukhanovskii, V.A. and and Synakowski, E.J.},
abstractNote = {We report observations of the first low-to-high (L-H) confinement mode transitions in the National Spherical Torus Experiment (NSTX). The H-mode energy confinement time increased over reference L-mode discharges transiently by 100-300%, as high as {approximately}150 ms. This confinement time is {approximately}1.8-2.3 times higher than predicted by a multi-machine ELM-free H-mode scaling. This achievement extends the H-mode window of fusion devices down to a record low aspect ratio (R/a) {approximately} 1.3, challenging both confinement and L-H power thresholds scalings based on conventional aspect ratio tokamaks.},
doi = {10.2172/784549},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu May 10 00:00:00 EDT 2001},
month = {Thu May 10 00:00:00 EDT 2001}
}

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