Overview of recent physics results from the national spherical torus experiment (NSTX)
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- Title
- Overview of recent physics results from the national spherical torus experiment (NSTX)
- Authors
- Menard, JE; Bell, MG; Bell, RE; Bernabei, S; Bialek, J; Biewer, T; Blanchard, W; Boedo, J; Bush, CE; Carter, MD; Choe, W; Crocker, NA; Darrow, DS; Davis, W; Delgado-Aparicio, L; Diem, S; Domier, CW; D'Ippolito, DA; Ferron, J; Field, A; Foley, J; Fredrickson, ED; Gates, DA; Gibney, T; Harvey, R; Hatcher, RE; Heidbrink, W; Hill, KW; Hosea, JC; Jarboe, TR; Johnson, DW; Kaita, R; Kaye, SM; Kessel, CE; Kubota, S; Kugel, HW; Lawson, J; LeBlanc, BP; Lee, KC; Levinton, FM; Luhmann, NC; Maingi, R; Majeski, RP; Manickam, J; Mansfield, DK; Maqueda, R; Marsala, R; Mastrovito, D; Mau, TK; Mazzucato', E; Meyer, MH; Mikkelseni, DR; Mueller, D; Munsat, T; Kessel, CE; Kubota, S; Kugel, HW; Lawson, J; LeBlanc, BP; Lee, KC; Levinton, FM; Luhmann, NC; Maingi, R; Majeski, RP; Manickam, J; Mansfield, DK; Maquedal, R; Marsala, R; Mastrovito, D; Mau, TK; Mazzucato', E; Meyer, MH; Mikkelsen, DR; Mueller, D; Munsat, T; Myra, JR; Nelson, BA; Neumeyer, C; Nishino, N; Ono, M; Park, HK; Park, W; Paul, SF; Peebles, T; Peng, M; Phillips, C; Pigarov, A; Pinsker, R; Ramakrishnan, ARS; Rasmussen, D; Redi, M; Rensink, M; Rewoldt, G; Robinson, J; Roney, P; Roquemore, AL; Ruskov, E; Ryan, R; Sabbagh, SA; Skinner, CH; Smith, DR; Sontag, A; Soukhanovskii, V; Stevenson, T; Stotler, D; Stratton, BC; Stutman, D; Swain, D; Synakowski, E; Takase, Y; Taylor, G; Tritz, K; Von Halle, A; Wade, M; White, R; Wilgen, J; Williams, M; J, RW; Yuh, H; Zakharov, LE; Zhu, W; Zweben, SJ; Akers, R; Beiersdorfer, P; Betti, R; Bigelow, T; Bitter, M; Bonoli, P; Bourdelle, C; Chang, CS; Chrzanowski, J; Dudek, L; Efthimion, PC; Finkenthal, M; Fredd, E; Fu, GY; Glasser, A; Goldston, RJ; Greenough, NL; Grisham, LR; Gorelenkov, N; GuaZZotto, L; Hawryluk, RJ; Hogan, J; Houlberg, W; Humphreys, D; Jaeger, F; Kalish, M; Krasheninnikov, S; Lao, LL; Lawrence, J; Leuerl, J; Liu, D; Oliaro, G; Pacella, D; Parsellsi, R; Schaffer, M; Semenov, I; Shaing, KC; Shapiro', MA; Shinohara, K; Sichta, P; Tang, X; Vero, R; Walker, M; Wampler, W
- Date Issued
- 2007-10
- Publisher
- INT ATOMIC ENERGY AGENCY
- Abstract
- The National Spherical Torus Experiment (NSTX) has made considerable progress in advancing the scientific understanding of high performance long-pulse plasmas needed for future spherical torus (ST) devices and ITER. Plasma durations up to 1.6 s (five current redistribution times) have been achieved at plasma currents of 0.7 MA with non-inductive current fractions above 65% while simultaneously achieving beta(T) and beta(N) values of 17% and 5.7 (%m T MA(-1)), respectively. A newly available motional Stark effect diagnostic has enabled validation of current-drive sources and improved the understanding of NSTX 'hybrid'-like scenarios. In MHD research, ex-vessel radial field coils have been utilized to infer and correct intrinsic EFs, provide rotation control and actively stabilize the n = 1 resistive wall mode at ITER-relevant low plasma rotation values. In transport and turbulence research, the low aspect ratio and a wide range of achievable in the NSTX provide unique data for confinement scaling studies, and a new microwave scattering diagnostic is being used to investigate turbulent density fluctuations with wavenumbers extending from ion to electron gyro-scales. In energetic particle research, cyclic neutron rate drops have been associated with the destabilization of multiple large toroidal Alfven eigenmodes (TAEs) analogous to the 'sea-of-TAE' modes predicted for ITER, and three-wave coupling processes have been observed for the first time. In boundary physics research, advanced shape control has enabled studies of the role of magnetic balance in H-mode access and edge localized mode stability. Peak divertor heat flux has been reduced by a factor of 5 using an H-mode-compatible radiative divertor, and lithium conditioning has demonstrated particle pumping and results in improved thermal confinement. Finally, non-solenoidal plasma start-up experiments have achieved plasma currents of 160 kA on closed magnetic flux surfaces utilizing coaxial helicity injection.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/28792
- DOI
- 10.1088/0029-5515/47/10/S13
- ISSN
- 0029-5515
- Article Type
- Article
- Citation
- NUCLEAR FUSION, vol. 47, no. 10, page. 645 - 657, 2007-10
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