G
G.A. Navratil
Researcher at Columbia University
Publications - 67
Citations - 3591
G.A. Navratil is an academic researcher from Columbia University. The author has contributed to research in topics: Tokamak & Plasma. The author has an hindex of 30, co-authored 62 publications receiving 3388 citations. Previous affiliations of G.A. Navratil include General Atomics.
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Journal ArticleDOI
Stabilization of the external kink and control of the resistive wall mode in tokamaks
Am Garofalo,A. D. Turnbull,E. J. Strait,Max E Austin,J.M. Bialek,Ming-Sheng Chu,E.D. Fredrickson,R.J. La Haye,G.A. Navratil,L.L. Lao,E. A. Lazarus,M. Okabayashi,B. W. Rice,S.A. Sabbagh,J. T. Scoville,T. S. Taylor,M.L. Walker +16 more
TL;DR: In this article, the authors used a conducting wall near the plasma to stabilize low-n ideal magnetohydrodynamic instabilities in high-beta tokamak plasmas.
Journal ArticleDOI
High poloidal beta equilibria in the Tokamak Fusion Test Reactor limited by a natural inboard poloidal field null
Steven Sabbagh,R. A. Gross,Michael E. Mauel,G.A. Navratil,M. G. Bell,R.E. Bell,Manfred Bitter,N. L. Bretz,R.V. Budny,C.E. Bush,M. S. Chance,P. C. Efthimion,E.D. Fredrickson,R. Hatcher,R.J. Hawryluk,S.P. Hirshman,A.C. Janos,S.C. Jardin,D. L. Jassby,J. Manickam,D.C. McCune,K. M. McGuire,S. S. Medley,D. Mueller,Yoshio Nagayama,D. K. Owens,M. Okabayashi,Hyeon K. Park,A. T. Ramsey,B. C. Stratton,E. J. Synakowski,G. Taylor,R. M. Wieland,M. C. Zarnstorff,Jay Kesner,E.S. Marmar,J.L. Terry +36 more
TL;DR: The Tokamak Fusion Test Reactor (TFTR) as mentioned in this paper has produced plasma equilibria with values of Λ≡βp eq+li/2 as large as 7, eβp∆dia≡2μ0e∆p⊥ ǫ 0.5 MJ and τE greater than 130 msec were obtained.
Journal ArticleDOI
The resistive wall mode and feedback control physics design in NSTX
Steven Sabbagh,J.M. Bialek,R. E. Bell,Alan H. Glasser,B.P. LeBlanc,Jonathan Menard,F. Paoletti,M.G. Bell,Richard Fitzpatrick,E.D. Fredrickson,Am Garofalo,David Gates,Stanley Kaye,L.L. Lao,Rajesh Maingi,D. Mueller,G.A. Navratil,Dan Stutman,W. Zhu +18 more
TL;DR: In this article, the authors investigated the physics of global mode stabilization in a low aspect ratio device, and the most effective configuration was computed to provide stabilization at βN up to 94% of the ideal with-wall limit.
Journal ArticleDOI
Overview of TFTR transport studies
R. J. Hawryluk,V. Arunasalam,Cris W. Barnes,Michael A. Beer,M. G. Bell,R. E. Bell,H. Biglari,Manfred Bitter,R. Boivin,N. Bretz,Robert Budny,C.E. Bush,Chio-Zong Cheng,T. K. Chu,Samuel A. Cohen,Steven Cowley,P. C. Efhimion,R.J. Fonck,E.D. Fredrickson,Harold P. Furth,Robert James Goldston,G. Greene,B. Grek,L. R. Grisham,Gregory W. Hammett,William Heidbrink,K. W. Hill,J.C. Hosea,R. A. Hulse,H. Hsuan,A.C. Janos,D.L. Jassby,F. C. Jobes,David W. Johnson,L. C. Johnson,Jay Kesner,C. Kieras‐Phillips,S. J. Kilpatrick,H.W. Kugel,P.H. La Marche,B. LeBlanc,Dennis M. Manos,D. K. Mansfield,E.S. Marmar,E. Mazzucato,M. McCarthy,Michael E. Mauel,D. C. McCune,K. McGuire,Dale Meade,S. S. Medley,D. R. Mikkelsen,D. A. Monticello,R. W. Motley,D. Mueller,Yoshio Nagayama,G.A. Navratil,Raffi Nazikian,D. K. Owens,Hyeon K. Park,W. Park,S. Paul,F. W. Perkins,S. Pitcher,A. T. Ramsey,M. H. Redi,G. Rewoldt,D. Roberts,A. L. Roquemore,P. H. Rutherford,S.A. Sabbagh,G. Schilling,J.F. Schivell,G. L. Schmidt,S. D. Scott,Joseph Snipes,J. E. Stevens,Brentley Stratton,W. Stodiek,E. J. Synakowski,Yuichi Takase,William Tang,G. Taylor,J.L. Terry,J. Timberlake,H. H. Towner,M. Ulrickson,S. von Goeler,R. M. Wieland,M. Williams,J. R. Wilson,K. L. Wong,Masaaki Yamada,S. Yoshikawa,K. M. Young,M. C. Zarnstorff,S. J. Zweben +96 more
TL;DR: A review of TFTR plasma transport studies is presented in this article, where parallel transport and the confinement of suprathermal ions are found to be relatively well described by theory and the underlying turbulence has been studied using microwave scattering, beam emission spectroscopy and microwave reflectometry over a much broader range in k perpendicular to than previously possible.
Journal ArticleDOI
Stabilization of the resistive wall mode in DIII-D by plasma rotation and magnetic feedback
M. Okabayashi,J.M. Bialek,M. S. Chance,Ming-Sheng Chu,E.D. Fredrickson,Am Garofalo,R. Hatcher,Torkil H. Jensen,L. C. Johnson,R.J. La Haye,G.A. Navratil,H. Reimerdes,J. T. Scoville,E. J. Strait,A. D. Turnbull,M.L. Walker +15 more
TL;DR: In this article, the resistive wall mode (RWM) was successfully demonstrated in the DIII-D tokamak by using rotational stabilization in conjunction with a close-fitting vacuum vessel wall.