Magnetohydrodynamic beta limits for tokamaks with negative central shear
作者： A Bondeson , M Benda , M Persson , M.S Chu
DOI: 10.1088/0029-5515/37/10/I08
关键词:
摘要: Magnetohydrodynamic (MHD) operational limits are computed for tokamaks with negative central shear (NCS). Beta optimized profiles generated, imposing stability to ideal n = 1, 2, 3 and infinity modes without a conducting wall. In addition, the constrained so that no current drive is needed counterbalance bootstrap in steady state operation. Under this last condition, highest stable values of both β βN found high broad profiles. significantly above semi-empirical scaling ≤ 4li at low inductances, particular strong shaping. The broadness useful limited by appearance `ravines', where beta limit falls drastically qa below integer values. Low-n modes, n=1, peaking pressure, optimal pressure factors range 2.5 3. increases when elongation kappa triangularity delta increased, but not favourable triangularity. At low-q operation about 40% fraction, JET shaped cross-section, κ 1.6, δ 0.3, gives β* 6.2% while stronger shaping, 2.0 0.7, 9.8%. fraction 65%, corresponding rather low, 2.3% cross-section 3.5% 2.0, 0.7
harvard.edu
sci-hub.se 参考文章(23)
H. R. Wilson, J. W. Connor, R. J. Hastie, C. C. Hegna, Threshold for neoclassical magnetic islands in a low collision frequency tokamak Physics of Plasmas. ,vol. 3, pp. 248- 265 ,(1996) , 10.1063/1.871830
E. J. Strait, T. A. Casper, M. S. Chu, J. R. Ferron, A. Garofalo, C. M. Greenfield, R. J. La Haye, L. L. Lao, E. A. Lazarus, R. L. Miller, G. A. Navratil, C. Ren, B. W. Rice, I. Semenov, A. C. C. Sips, F. X. Söldner, B. W. Stallard, T. S. Taylor, A. D. Turnbull, , Stability of negative central magnetic shear discharges in the DIII-D tokamak Physics of Plasmas. ,vol. 4, pp. 1783- 1791 ,(1997) , 10.1063/1.872366
F. M. Levinton, M. C. Zarnstorff, S. H. Batha, M. Bell, R. E. Bell, R. V. Budny, C. Bush, Z. Chang, E. Fredrickson, A. Janos, J. Manickam, A. Ramsey, S. A. Sabbagh, G. L. Schmidt, E. J. Synakowski, G. Taylor, Improved confinement with reversed magnetic shear in TFTR. Physical Review Letters. ,vol. 75, pp. 4417- 4420 ,(1995) , 10.1103/PHYSREVLETT.75.4417
F Troyon, R Gruber, H Saurenmann, S Semenzato, S Succi, MHD-limits to plasma confinement Plasma Physics and Controlled Fusion. ,vol. 26, pp. 209- 215 ,(1984) , 10.1088/0741-3335/26/1A/319
A. Bondeson, D. J. Ward, Stabilization of external modes in tokamaks by resistive walls and plasma rotation Physical Review Letters. ,vol. 72, pp. 2709- 2712 ,(1994) , 10.1103/PHYSREVLETT.72.2709
L. L. Lao, T. S. Taylor, M. S. Chu, V. S. Chan, J. R. Ferron, E. J. Strait, Effects of current profile on the ideal ballooning mode Physics of Fluids B: Plasma Physics. ,vol. 4, pp. 232- 240 ,(1992) , 10.1063/1.860438
H. Lütjens, A. Bondeson, O. Sauter, The CHEASE code for toroidal MHD equilibria Computer Physics Communications. ,vol. 97, pp. 219- 260 ,(1996) , 10.1016/0010-4655(96)00046-X
T S Taylor, H St John, A D Turnbull, V R Lin-Liu, K H Burrell, V Chan, M S Chu, J R Ferron, L L Lao, R J La Haye, E A Lazarus, R L Miller, P A Politzer, D P Schissel, E J Strait, Optimized profiles for improved confinement and stability in the DIII-D tokamak Plasma Physics and Controlled Fusion. ,vol. 36, ,(1994) , 10.1088/0741-3335/36/12B/019
D. J. Ward, A. Bondeson, Stabilization of ideal modes by resistive walls in tokamaks with plasma rotation and its effect on the beta limit Physics of Plasmas. ,vol. 2, pp. 1570- 1580 ,(1995) , 10.1063/1.871307
A. Bondeson, G. Vlad, H. Lütjens, Resistive toroidal stability of internal kink modes in circular and shaped tokamaks Physics of Fluids B: Plasma Physics. ,vol. 4, pp. 1889- 1900 ,(1992) , 10.1063/1.860041