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Ga – a 23513 Long-pulse , High-performance Discharges in the Diii – D Tokamak
| Content Provider | Semantic Scholar |
|---|---|
| Author | Luce, Timothy C. Wade, M. R. Politzer, Peter Allen, Sarah Leatherman Austin, Max E. Baker, Daniel R. Bray, Bruce D. Brennan, Dylan P. Burrell, Keith H. Casper, T. A. Doyle, Edward Ferron, John R. Garofalo, Andrea M. Gohil, N. B. Gorelov, Iu. A. Greenfield, Charles Groebner, Richard J. Heidbrink, William W. Hsieh, C. L. Hyatt, A. W. Jayakumar, Raghavan 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 Mahdavi, M. Ali Makowski, Michael A. Murakami, M. Petty, C. C. Pinsker, Robert Isaac Prater, Ron Rettig, C. L. Rhodes, Terry L. Rice, Brian W. Taylor, Tony S. Thomas, D. M. Turnbull, Alan D. Watkins, Jonathan G. West, W. P. Wong, K.-L. |
| 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 ~10 has been sustained for >5 τE with qmin >1.5. (The normalized performance is measured by the product βN H89 indicating the proximity to the conventional β limits and energy confinement quality, respectively.) These H–mode discharges have an ELMing edge and β <~ 5%. The limit to increasing β 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 ~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 β control, which are essential for operating advanced tokamak discharges, were demonstrated in ELMing H-mode discharges with βNH89 ~ 7 for up to 6.3 s or ~34 τE. These discharges appear to be in resistive equilibrium with qmin ~ 1.05, in agreement with the current profile relaxation time of 1.8 s. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://digital.library.unt.edu/ark:/67531/metadc739420/m2/1/high_res_d/805800.pdf |
| Alternate Webpage(s) | https://fusion.gat.com/pubs-ext/IAEA00/A23513.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
