Loading...
Please wait, while we are loading the content...
Similar Documents
Long-pulse, High-performance Discharges in the Diii-d Tokamak
| Content Provider | Semantic Scholar |
|---|---|
| Author | Luce, Tim C. Wade, Michael R. Politzer, P. I. A. Allen, Sarah Leatherman Austin, Max E. Baker, Dale R. Bray, B. Brennan, Dylan Burrell, Keith H. Casper, T. A. Boo, Jasmijn De Doyle, Edward Ferron, John R. Garofalo, Andrea M. Gohil, P. Gorelov, Iu. A. Greenfield, Charles Groebner, Richard J. Heibrink, W. W. Hsieh, Ching L. Hyatt, A. W. Jayakumar, R. Kinsey, J. E. Haye, R. J. La Lao, Luciana Lisa. Lasnier, C. J. Lazarus, Edward Alan Leonard, A. W. Lin-Liu, Y.-R. Lohr, John Makowski Murakami, Masami Petty, Clinton Craig Pinsker, Robert Isaac Prater, Ron Rettig, C. L. Rhodes, T. L. Rice, Brian W. Taylor, Tony S. Thomas, D. M. Turnbull, A. D. Watkins, Jonathan G. West, W. P. Wong, Kin Lap |
| Copyright Year | 2000 |
| Abstract | Significant progress in obtaining high performance discharges for many energy confinement times in the DIII-D tokamak has been realized since the previous IAEA meeting. In relation to previous discharges, normalized performance {approx}10 has been sustained for >5 {tau}{sub E} with q{sub min} >1.5. (The normalized performance is measured by the product {beta}{sub N} H{sub 89} indicating the proximity to the conventional {beta} limits and energy confinement quality, respectively.) These H-mode discharges have an ELMing edge and {beta} {approx}{le} 5%. The limit to increasing {beta} is a resistive wall mode, rather than the tearing modes previously observed. Confinement remains good despite the increase in q. The global parameters were chosen to optimize the potential for fully non-inductive current sustainment at high performance, which is a key program goal for the DIII-D facility in the next two years. Measurement of the current density and loop voltage profiles indicate {approx}75% of the current in the present discharges is sustained non-inductively. The remaining ohmic current is localized near the half radius. The electron cyclotron heating system is being upgraded to replace this remaining current with ECCD. Density and {beta} control, which are essential for operating advanced tokamak discharges, were demonstrated in ELMing H-mode discharges with {beta}{sub N}H{sub 89} {approx} 7 for up to 6.3 s or {approx} 34 {tau}{sub E}. These discharges appear to be in resistive equilibrium with q{sub min} {approx} 1.05, in agreement with the current profile relaxation time of 1.8 s. |
| File Format | PDF HTM / HTML |
| DOI | 10.1088/0029-5515/41/11/308 |
| Alternate Webpage(s) | https://www-pub.iaea.org/MTCD/Publications/PDF/csp_008c/pdf/ex4_3.pdf |
| Alternate Webpage(s) | https://cloudfront.escholarship.org/dist/prd/content/qt6mm1021x/qt6mm1021x.pdf?t=p16b9r |
| Alternate Webpage(s) | https://fusion.gat.com/pubs-ext/IAEA00/A23513abs.pdf |
| Alternate Webpage(s) | https://doi.org/10.1088/0029-5515%2F41%2F11%2F308 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
