Overview of recent physics results from the national spherical torus experiment (NSTX)

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Menard, JE / Bell, MG / Bell, RE / Bernabei, S / Bialek, J / Biewer, T / Blanchard, W / Boedo, J / Bush, CE / Carter, MD / Choe, Wonhoresearcher / Crocker, NA / Darrow, DS / Davis, W / Delgado-Aparicio, L / Diem, S / Domier, CW / DIppolito, 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 / Maquedal, R / Mikkelsen, DR / 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 / 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
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.
Publisher
INT ATOMIC ENERGY AGENCY
Issue Date
2007-10
Language
English
Article Type
Article; Proceedings Paper
Keywords

POWER-PLANT; PLASMAS; TOKAMAK; CONFINEMENT; REGIME; MODES

Citation

NUCLEAR FUSION, v.47, pp.S645 - S657

ISSN
0029-5515
URI
http://hdl.handle.net/10203/91551
Appears in Collection
NE-Journal Papers(저널논문)
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