Overview of physics results from MAST

Autor: Choong-Seock Chang, Guoqin Yu, Guoyong Fu, Allen H. Boozer, Jong-Kyu Park, William Heidbrink, A. Bortolon, Stephen Jardin, S. Ethier, H.W. Kugel, Eugenio Schuster, Alexander Smirnov, Maxim Umansky, R. E. Bell, B. Stratton, David N. Ruzic, D.A. Humphreys, W. Davis, Calvin Domier, Nobuhiro Nishino, F. Jaeger, Brian Nelson, Y. Liang, C. Taylor, Ahmed Hassanein, Gennady V. Miloshevsky, David R. Smith, R. Nygren, W. X. Wang, J.R. Myra, D. S. Darrow, C.H. Skinner, Jean Paul Allain, J. Whaley, Leonid E. Zakharov, K.L. Wong, Mario Podesta, Robert Bastasz, Elena Belova, Roscoe White, Clarence Worth Rowley, H. Takahashi, P.T. Bonoli, T.S. Bigelow, William Dorland, Tobin Munsat, Masayuki Ono, Sergei Krasheninnikov, J. C. Hosea, Dennis L. Youchison, Z. Xia, E. Ruskov, S. S. Medley, J.R. Ferron, D. Russell, Ahmed Diallo, Richard Majeski, S. Ding, D.C. McCune, D. Zemlyanov, P. B. Snyder, Todd Evans, J.M. Bialek, H. F. Meyer, G. Taylor, T.K. Gray, G. Zimmer, O. Katsuro-Hopkins, B.P. LeBlanc, John Wright, M.G. Bell, J.A. Boedo, D. Mueller, William R. Wampler, M.J. Schaffer, D. J. Battaglia, D. Liu, R. J. Buttery, Aaron Sontag, Robert Kaita, Stanley Kaye, S. Kubota, Manfred Bitter, P. W. Ross, S.F. Paul, L. F. Delgado-Aparicio, Fred Levinton, G. Caravelli, Peter Beiersdorfer, Stewart Zweben, Yoshiki Hirooka, George McKee, Hyeon K. Park, B.G. Penaflor, G. Rewoldt, Dan Stutman, W. M. Solomon, Michael Jaworski, Thomas Jarboe, Yuichi Takase, Dylan Brennan, S.P. Gerhardt, John Berkery, J. Breslau, A. Pigarov, Jonathan Menard, John B Wilgen, T.S. Hahm, D.K. Mansfield, K. C. Lee, T.H. Osborne, T. Stoltzfus-Dueck, E. B. Hooper, Adam McLean, K. Indireshkumar, Xian-Zhu Tang, R. W. Harvey, C. K. Phillips, Naoki Tamura, J. Manickam, Neal Crocker, H. Yuh, R. Frazin, J. Kallman, D. Tsarouhas, Michael Finkenthal, R.J. Maqueda, Alan H. Glasser, R. Andre, Nikolai Gorelenkov, K. W. Hill, B. Hu, W. A. Peebles, B. McGeehan, H. Reimerdes, Valeryi Sizyuk, Jakub Urban, L.L. Lao, Kouji Shinohara, Chase N. Taylor, R. Wilson, R.J. La Haye, C.E. Kessel, Woochang Lee, S.A. Sabbagh, Joon-Wook Ahn, D. R. Mikkelsen, P.M. Ryan, Riccardo Betti, M. Menon, Vladimir Shevchenko, J. Kim, Kevin Tritz, Josef Preinhaelter, Y. Guo, E. Mazzucato, W. Guttenfelder, M.L. Walker, D.P. Stotler, Roger Raman, Rajesh Maingi, Filippo Scotti, V. A. Soukhanovskii, John Canik, D. A. D'Ippolito, R.J. Fonck, E.D. Fredrickson, Ker-Chung Shaing, J. Foley, Y. Ren, David Gates, Egemen Kolemen, Neville C. Luhmann, J.A. Leuer
Přispěvatelé: Science and Technology of Nuclear Fusion
Jazyk: angličtina
Rok vydání: 2011
Předmět:
Zdroj: Nuclear Fusion, 51(9-S1):043007, 094013-1/10. Institute of Physics
Hendrik Meyer
Nuclear Fusion, 51, 094013
ISSN: 1741-4326
0029-5515
DOI: 10.1088/0029-5515/51/9/094013
Popis: Major developments on the Mega Amp Spherical Tokamak (MAST) have enabled important advances in support of ITER and the physics basis of a spherical tokamak (ST) based component test facility (CTF), as well as providing new insight into underlying tokamak physics. For example, L–H transition studies benefit from high spatial and temporal resolution measurements of pedestal profile evolution (temperature, density and radial electric field) and in support of pedestal stability studies the edge current density profile has been inferred from motional Stark effect measurements. The influence of the q-profile and E × B flow shear on transport has been studied in MAST and equilibrium flow shear has been included in gyro-kinetic codes, improving comparisons with the experimental data. H-modes exhibit a weaker q and stronger collisionality dependence of heat diffusivity than implied by IPB98(y,2) scaling, which may have important implications for the design of an ST-based CTF. ELM mitigation, an important issue for ITER, has been demonstrated by applying resonant magnetic perturbations (RMPs) using both internal and external coils, but full stabilization of type-I ELMs has not been observed. Modelling shows the importance of including the plasma response to the RMP fields. MAST plasmas with q > 1 and weak central magnetic shear regularly exhibit a long-lived saturated ideal internal mode. Measured plasma braking in the presence of this mode compares well with neo-classical toroidal viscosity theory. In support of basic physics understanding, high resolution Thomson scattering measurements are providing new insight into sawtooth crash dynamics and neo-classical tearing mode critical island widths. Retarding field analyser measurements show elevated ion temperatures in the scrape-off layer of L-mode plasmas and, in the presence of type-I ELMs, ions with energy greater than 500 eV are detected 20 cm outside the separatrix. Disruption mitigation by massive gas injection has reduced divertor heat loads by up to 70%.
Databáze: OpenAIRE
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