J
John Lohr
Researcher at General Atomics
Publications - 140
Citations - 3003
John Lohr is an academic researcher from General Atomics. The author has contributed to research in topics: Tokamak & DIII-D. The author has an hindex of 30, co-authored 139 publications receiving 2776 citations. Previous affiliations of John Lohr include National Renewable Energy Laboratory.
Papers
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Journal Article
Control of Neoclassical Tearing Modes in DIII-D
A.S. Welander,R.J. LaHaye,B.G. Penaflor,John Lohr,V. Noraky,Ron Prater,N.W. Eidietis,David Humphreys,Egemen Kolemen,Francesca Turco +9 more
TL;DR: Luxon et al. as mentioned in this paper used active feedback control to provide continuous, precise positioning in the DIII-D tokamak in the presence of periodic q = 1 sawtooth instabilities.
Proceedings ArticleDOI
An in-line power monitor for HE/sub 11/ low loss transmission lines
TL;DR: In this paper, a power monitor was developed for the DIII-D 110 GHz EC transmission line, which allows for the measurement of power flowing in the transmission line before it reaches the launch.
Journal ArticleDOI
Complete suppression of the m = 2/n = 1 neoclassical tearing mode using electron cyclotron current drive in DIII-D
Cc Petty,R.J. La Haye,T.C. Luce,David Humphreys,A.W. Hyatt,John Lohr,Ron Prater,E. J. Strait,M. R. Wade +8 more
TL;DR: The first suppression of the important and deleterious m = 2/n = 1 neoclassical tearing mode (NTM) was reported using electron cyclotron current drive (ECCD) to replace the missing bootstrap current in the island O-point as discussed by the authors.
Journal ArticleDOI
Electron cyclotron emission radiometer upgrade on the DIII-D tokamak
Max E Austin,John Lohr +1 more
TL;DR: In this paper, the electron cyclotron emission (ECE) heterodyne radiometer diagnostic on DIII-D has been upgraded with the addition of eight channels for a total of 40.
Journal ArticleDOI
Confinement physics of H-mode discharges in DIII-D
K. H. Burrell,S L Allen,G. Bramson,N.H. Brooks,R. W. Callis,T. N. Carlstrom,M S Chu,A P Colleraine,J.C. DeBoo,R. R. Dominguez,J.R. Ferron,R L Freeman,P. Gohil,C. M. Greenfield,R. J. Groebner,G. Haas,William Heidbrink,D. N. Hill,F.L. Hinton,R.-M. Hong,W. Howl,C. L. Hsieh,G.L. Jackson,G. L. Jahns,R. A. James,A.G. Kellman,J.S. Kim,L.L. Lao,E. A. Lazarus,T. Lehecka,J Lister,John Lohr,T.C. Luce,J L Luxon,M.A. Mahdavi,H Matsumoto,M Mayberry,C.P. Moeller,Y Neyatani,T Ohkawa,Nobuyoshi Ohyabu,T Okazaki,T.H. Osborne,D O Overskei,T Ozeki,A Peebles,S Perkins,Mark E. Perry,P.I. Petersen,T.W. Petrie,Rolf Philipona,J.C. Phillips,R. I. Pinsker,P.A. Politzer,G.D. Porter,R. Prater,M.E. Rensink,M.J. Schaffer,D.P. Schissel,J. T. Scoville,R. P. Seraydarian,Michiya Shimada,T. C. Simonen,R. T. Snider,G. M. Staebler,B. W. Stallard,R.D. Stambaugh,R. D. Stav,H.E. St. John,R. E. Stockdale,E. J. Strait,Taylor P L,T. S. Taylor,P K Trost,Ulrich Stroth,R. E. Waltz,S M Wolfe,R. D. Wood,D. Wroblewski +78 more
TL;DR: In this paper, the L-mode to H-mode transition in the DIII-D tokamak is associated with the sudden reduction in anomalous, fluctuation-connected transport across the outer midplane of the plasma.