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Title: High poloidal beta equilibria in the Tokamak Fusion Test Reactor limited by a natural inboard poloidal field null*

Abstract

Recent operation of the Tokamak Fusion Test Reactor (TFTR) (Plasma Phys. Controlled Nucl. Fusion Research 1, 51 (1986)) has produced plasma equilibria with values of Λ≡β p eq+ l i/2 as large as 7, εβ p dia≡ 2μ0ε {l angle} p ⊥ {r angle}/{l angle}{l angle} B p{r angle}{r angle}2 as large as 1.6, and Troyon normalized diamagnetic beta (Plasma Phys. Controlled Fusion 26, 209 (1984); Phys. Lett. 110A, 29 (1985)), β Ndia≡10⁸{l angle}βt⊥{r angle} aB 0/ Ip as large as 4.7. When εβ p dia≳ 1.25, a separatrix entered the vacuum chamber, producing a naturally diverted discharge that was sustained for many energy confinement times, τ E. The largest values of εβ p and plasma stored energy were obtained when the plasma current was ramped down prior to neutral beam injection. The measured peak ion and electron temperatures were as large as 24 and 8.5 keV, respectively. Plasma stored energy in excess of 2.5 MJ and τ E greater than 130 msec were obtained. Confinement times of greater than 3 times that expected from L-mode predictions have been achieved. The fusion power gain Q DD reached a value of 1.3 x 10₋3 in a discharge with I p=1 MAmore » and εβ p dia = 0.85. A large, sustained negative loop voltage during the steady-state portion of the discharge indicates that a substantial noninductive component of I p exists in these plasmas. Transport code analysis indicates that the bootstrap current constitutes up to 65% of I p.« less

Authors:
 [1];  [1];  [1];  [1];  [2];  [2];  [2];  [2];  [2];  [2];  [2];  [2];  [2];  [2];  [2];  [2];  [2];  [2];  [2];  [2] more »;  [2];  [2];  [2];  [2];  [2];  [2];  [2];  [2];  [2];  [2];  [2];  [2];  [2];  [2];  [3];  [3];  [3] « less
+ Show Author Affiliations
  1. Columbia Univ., New York, NY (United States). Department of Applied Physics
  2. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  3. MIT (Massachusetts Inst. of Technology), Cambridge, MA (United States). Plasma Fusion Center
Publication Date:
Research Org.:
Columbia Univ., New York, NY (United States). Department of Applied physics
Sponsoring Org.:
USDOE
OSTI Identifier:
5535431
DOE Contract Number:  
FG02-89ER53297; AC02-76CH03073; FG02-90ER54084
Resource Type:
Journal Article
Journal Name:
Physics of Fluids. B, Plasma Physics
Additional Journal Information:
Journal Volume: 3; Journal Issue: 8; Journal ID: ISSN 0899-8221
Publisher:
American Institute of Physics
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; HIGH-BETA PLASMA; EQUILIBRIUM; TFTR TOKAMAK; OPERATION; BALLOONING INSTABILITY; BOOTSTRAP CURRENT; ELECTRIC DISCHARGES; ELECTRON TEMPERATURE; ENERGY STORAGE; ION TEMPERATURE; PLASMA CONFINEMENT; PRESSURE GRADIENTS; STABILITY; STEADY-STATE CONDITIONS; VACUUM SYSTEMS; CONFINEMENT; CURRENTS; ELECTRIC CURRENTS; INSTABILITY; PLASMA; PLASMA INSTABILITY; PLASMA MACROINSTABILITIES; STORAGE; THERMONUCLEAR REACTORS; TOKAMAK TYPE REACTORS; 700101* - Fusion Energy- Plasma Research- Confinement, Heating, & Production; 700102 - Fusion Energy- Plasma Research- Diagnostics; 700107 - Fusion Energy- Plasma Research- Instabilities

Citation Formats

Sabbagh, S. A., Gross, R. A., Mauel, M. E., Navratil, G.. A., Bell, M. G., Bell, R., Bitter, M., Bretz, N. L., Budny, R. V., Bush, C. E., Chance, M. S., Efthimion, P. C., Fredrickson, E. D., Hatcher, R., Hawryluk, R. J., Hirshman, S. P., Janos, A C, Jardin, S. C., Jassby, D. L., Manickam, J., McCune, D. C., McGuire, K. M., Medley, S. S., Mueller, D., Nagayama, Y., Owens, D. K., Okabayashi, M., Park, H. K., Ramsey, A. T., Stratton, B. C., Synakowski, E. J., Taylor, G., Wieland, R. M., Zarnstorff, M. C., Kesner, J., Marmar, E. S., and Terry, J. L. High poloidal beta equilibria in the Tokamak Fusion Test Reactor limited by a natural inboard poloidal field null*. United States: N. p., 1991. Web. doi:10.1063/1.859647.
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Sabbagh, S. A., Gross, R. A., Mauel, M. E., Navratil, G.. A., Bell, M. G., Bell, R., Bitter, M., Bretz, N. L., Budny, R. V., Bush, C. E., Chance, M. S., Efthimion, P. C., Fredrickson, E. D., Hatcher, R., Hawryluk, R. J., Hirshman, S. P., Janos, A C, Jardin, S. C., Jassby, D. L., Manickam, J., McCune, D. C., McGuire, K. M., Medley, S. S., Mueller, D., Nagayama, Y., Owens, D. K., Okabayashi, M., Park, H. K., Ramsey, A. T., Stratton, B. C., Synakowski, E. J., Taylor, G., Wieland, R. M., Zarnstorff, M. C., Kesner, J., Marmar, E. S., & Terry, J. L. High poloidal beta equilibria in the Tokamak Fusion Test Reactor limited by a natural inboard poloidal field null*. United States. https://doi.org/10.1063/1.859647
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Sabbagh, S. A., Gross, R. A., Mauel, M. E., Navratil, G.. A., Bell, M. G., Bell, R., Bitter, M., Bretz, N. L., Budny, R. V., Bush, C. E., Chance, M. S., Efthimion, P. C., Fredrickson, E. D., Hatcher, R., Hawryluk, R. J., Hirshman, S. P., Janos, A C, Jardin, S. C., Jassby, D. L., Manickam, J., McCune, D. C., McGuire, K. M., Medley, S. S., Mueller, D., Nagayama, Y., Owens, D. K., Okabayashi, M., Park, H. K., Ramsey, A. T., Stratton, B. C., Synakowski, E. J., Taylor, G., Wieland, R. M., Zarnstorff, M. C., Kesner, J., Marmar, E. S., and Terry, J. L. 1991. "High poloidal beta equilibria in the Tokamak Fusion Test Reactor limited by a natural inboard poloidal field null*". United States. https://doi.org/10.1063/1.859647.
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@article{osti_5535431,
title = {High poloidal beta equilibria in the Tokamak Fusion Test Reactor limited by a natural inboard poloidal field null*},
author = {Sabbagh, S. A. and Gross, R. A. and Mauel, M. E. and Navratil, G.. A. and Bell, M. G. and Bell, R. and Bitter, M. and Bretz, N. L. and Budny, R. V. and Bush, C. E. and Chance, M. S. and Efthimion, P. C. and Fredrickson, E. D. and Hatcher, R. and Hawryluk, R. J. and Hirshman, S. P. and Janos, A C and Jardin, S. C. and Jassby, D. L. and Manickam, J. and McCune, D. C. and McGuire, K. M. and Medley, S. S. and Mueller, D. and Nagayama, Y. and Owens, D. K. and Okabayashi, M. and Park, H. K. and Ramsey, A. T. and Stratton, B. C. and Synakowski, E. J. and Taylor, G. and Wieland, R. M. and Zarnstorff, M. C. and Kesner, J. and Marmar, E. S. and Terry, J. L.},
abstractNote = {Recent operation of the Tokamak Fusion Test Reactor (TFTR) (Plasma Phys. Controlled Nucl. Fusion Research 1, 51 (1986)) has produced plasma equilibria with values of Λ≡β p eq+ l i/2 as large as 7, εβ p dia≡ 2μ0ε {l angle} p ⊥ {r angle}/{l angle}{l angle} B p{r angle}{r angle}2 as large as 1.6, and Troyon normalized diamagnetic beta (Plasma Phys. Controlled Fusion 26, 209 (1984); Phys. Lett. 110A, 29 (1985)), β Ndia≡10⁸{l angle}βt⊥{r angle} aB 0/ Ip as large as 4.7. When εβ p dia≳ 1.25, a separatrix entered the vacuum chamber, producing a naturally diverted discharge that was sustained for many energy confinement times, τ E. The largest values of εβ p and plasma stored energy were obtained when the plasma current was ramped down prior to neutral beam injection. The measured peak ion and electron temperatures were as large as 24 and 8.5 keV, respectively. Plasma stored energy in excess of 2.5 MJ and τ E greater than 130 msec were obtained. Confinement times of greater than 3 times that expected from L-mode predictions have been achieved. The fusion power gain Q DD reached a value of 1.3 x 10₋3 in a discharge with I p=1 MA and εβ p dia = 0.85. A large, sustained negative loop voltage during the steady-state portion of the discharge indicates that a substantial noninductive component of I p exists in these plasmas. Transport code analysis indicates that the bootstrap current constitutes up to 65% of I p.},
doi = {10.1063/1.859647},
url = {https://www.osti.gov/biblio/5535431}, journal = {Physics of Fluids. B, Plasma Physics},
issn = {0899-8221},
number = 8,
volume = 3,
place = {United States},
year = {Thu Aug 01 00:00:00 EDT 1991},
month = {Thu Aug 01 00:00:00 EDT 1991}
}
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Journal Article:
https://doi.org/10.1063/1.859647
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