A
A. T. Ramsey
Researcher at Princeton Plasma Physics Laboratory
Publications - 137
Citations - 5064
A. T. Ramsey is an academic researcher from Princeton Plasma Physics Laboratory. The author has contributed to research in topics: Tokamak Fusion Test Reactor & Plasma. The author has an hindex of 38, co-authored 137 publications receiving 4928 citations. Previous affiliations of A. T. Ramsey include University of Wisconsin-Madison & General Atomics.
Papers
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Journal ArticleDOI
Improved confinement with reversed magnetic shear in TFTR.
Fred Levinton,M. C. Zarnstorff,S. H. Batha,M.G. Bell,R. E. Bell,Robert Budny,C.E. Bush,Z. Chang,E.D. Fredrickson,A. Janos,J. Manickam,A. T. Ramsey,S.A. Sabbagh,G. L. Schmidt,E. J. Synakowski,G. Taylor +15 more
TL;DR: In this paper, a new tokamak confinement regime has been observed on the Tokamak Fusion Test Reactor (TFTR), where particle and ion thermal diffusivities drop precipitously by a factor of \ensuremath{\sim}40 to the neoclassical level for the particles and to much less than the NE value for the ions in the region with reversed shear.
Journal ArticleDOI
High-temperature plasmas in a tokamak fusion test reactor
J. D. Strachan,M. Bitter,A. T. Ramsey,M. C. Zarnstorff,V. Arunasalam,M. G. Bell,N. L. Bretz,Robert Budny,C. E. Bush,S. L. Davis,H. F. Dylla,P. C. Efthimion,R. J. Fonck,E. Fredrickson,H. P. Furth,Robert James Goldston,L. R. Grisham,B. Grek,R. J. Hawryluk,W. W. Heidbrink,H. W. Hendel,K. W. Hill,H. Hsuan,K. P. Jaehnig,D. L. Jassby,F. Jobes,D. W. Johnson,L. C. Johnson,R. Kaita,J. Kampershroer,R. J. Knize,T. A. Kozub,B. Leblanc,F. Levinton,P.H. La Marche,Dennis M. Manos,D. K. Mansfield,K. McGuire,D. H. McNeill,Dale Meade,S. S. Medley,W. Morris,D. Mueller,E. B. Nieschmidt,D. K. Owens,H. Park,J. Schivell,G. Schilling,G. L. Schmidt,S. D. Scott,S. Sesnic,J. C. Sinnis,F. J. Stauffer,B. C. Stratton,G. D. Tait,G. Taylor,H. H. Towner,M. J. Ulrickson,S. von Goeler,R. Wieland,M. D. Williams,K. L. Wong,S. Yoshikawa,K. M. Young,S. J. Zweben +64 more
TL;DR: The ion temperature and the deuterium-fusion neutron yields were significantly higher than for previous tokamak experiments and the low initial densities were achieved by operation of the Tokamak Fusion Test Reactor with low plasma currents and by extensive limiter conditioning.
Journal ArticleDOI
Multichannel grazing-incidence spectrometer for plasma impurity diagnosis: SPRED
TL;DR: A compact vacuum ultraviolet spectrometer system has been developed to provide time-resolved impurity spectra from tokamak plasmas and its sensitivity is comparable with that of a conventional grazing-incidence monochromator.
Journal ArticleDOI
Enhancement of Tokamak Fusion Test Reactor performance by lithium conditioning
D.K. Mansfield,K. W. Hill,J. D. Strachan,M. G. Bell,S. D. Scott,Robert Budny,E.S. Marmar,J. A. Snipes,J. L. Terry,S. H. Batha,R.E. Bell,Manfred Bitter,C.E. Bush,Z. Chang,D. S. Darrow,D.R. Ernst,E.D. Fredrickson,B. Grek,H. W. Herrmann,A.C. Janos,D. L. Jassby,F. C. Jobes,David W. Johnson,L. C. Johnson,Fred Levinton,D. R. Mikkelsen,D. Mueller,D. K. Owens,Hyeon K. Park,A. T. Ramsey,A. L. Roquemore,C.H. Skinner,T. Stevenson,B. C. Stratton,E. J. Synakowski,G. Taylor,A. von Halle,S. von Goeler,K. L. Wong,S. J. Zweben +39 more
TL;DR: Mc McGuire et al. as discussed by the authors showed that the amount of lithium on the limiter and the effectiveness of its action can be maximized through injecting four Li pellets into Ohmic plasmas of increasing major and minor radius.
Journal ArticleDOI
Local measurements of correlated momentum and heat transport in the TFTR tokamak.
S. D. Scott,Patrick Diamond,R. J. Fonck,Robert James Goldston,R. B. Howell,K. P. Jaehnig,G. Schilling,E. J. Synakowski,M. C. Zarnstorff,C. E. Bush,E.D. Fredrickson,K. W. Hill,A.C. Janos,D. K. Mansfield,D. K. Owens,Hyeon K. Park,G. Pautasso,A. T. Ramsey,J.F. Schivell,G. D. Tait,William Tang,G. Taylor +21 more
TL;DR: Simultaneous profile measurements of the toroidal rotation speed and ion temperature during unbalanced neutral beam injection in the Tokamak Fusion Test Reactor show that the ion momentum and thermal diffusivities are comparable in magnitude and vary similarly with plasma current and minor radius.