D
D.A. Humphreys
Researcher at General Atomics
Publications - 225
Citations - 5122
D.A. Humphreys is an academic researcher from General Atomics. The author has contributed to research in topics: Tokamak & DIII-D. The author has an hindex of 36, co-authored 217 publications receiving 4526 citations.
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Journal ArticleDOI
Chapter 3: MHD stability, operational limits and disruptions
T. C. Hender,J.C. Wesley,J.M. Bialek,Anders Bondeson,Allen H. Boozer,R.J. Buttery,Am Garofalo,Timothy Goodman,Robert Granetz,Y. Gribov,O. Gruber,Mikhail Gryaznevich,G. Giruzzi,Sibylle Günter,Nobuhiko Hayashi,Per Helander,Chris Hegna,D. F. Howell,D.A. Humphreys,G. T. A. Huysmans,A.W. Hyatt,Akihiko Isayama,Stephen Jardin,Yasunori Kawano,A. Kellman,C.E. Kessel,H. R. Koslowski,R. J. La Haye,E. Lazzaro,Yueqiang Liu,V.E. Lukash,J. Manickam,S. Medvedev,V. Mertens,S. V. Mirnov,Y. Nakamura,G.A. Navratil,M. Okabayashi,Takahisa Ozeki,Roberto Paccagnella,G. Pautasso,F. Porcelli,V. D. Pustovitov,V. Riccardo,M. Sato,Olivier Sauter,M.J. Schaffer,Michiya Shimada,Piergiorgio Sonato,E. J. Strait,M. Sugihara,Manabu Takechi,A. D. Turnbull,E. Westerhof,D.G. Whyte,R. Yoshino,H. Zohm +56 more
TL;DR: A review of recent advances in the area of MHD stability and disruptions, since the publication of the 1999 ITER Physics Basis document (1999 Nucl. Fusion 39 2137-2664), is reviewed in this paper.
Journal ArticleDOI
Measurements of injected impurity assimilation during massive gas injection experiments in DIII-D
E. M. Hollmann,T.C. Jernigan,P. B. Parks,J.A. Boedo,Todd Evans,M. Groth,D.A. Humphreys,A.N. James,M.J. Lanctot,Daisuke Nishijima,Dmitry Rudakov,H.A. Scott,E. J. Strait,M. A. Van Zeeland,J.C. Wesley,W.P. West,Wen Wu,J.H. Yu +17 more
TL;DR: In this paper, the mixing efficiencies of injected impurities into the plasma core are measured to be of order 0.05?0.4, where 0.4 is the average mixing efficiency.
Journal ArticleDOI
Fusion Nuclear Science Facility Candidates
R.D. Stambaugh,Vincent Chan,A.M. Garofalo,Mohamed E. Sawan,D.A. Humphreys,L.L. Lao,J.A. Leuer,T.W. Petrie,Ron Prater,P. B. Snyder,J. Smith,C.P.C. Wong +11 more
TL;DR: Two candidates for the FNSF are considered and the methods of selecting optimum machine design points versus aspect ratio are fully presented; both options appear viable.
Journal ArticleDOI
Commissioning and initial operation of KSTAR superconducting tokamak
Yeong-Kook Oh,W.C. Kim,Kaprai Park,M.K. Park,H.L. Yang,Y.S. Kim,Yong Chu,Young-ok Kim,J. G. Bak,E.N. Baang,S.W. Yoon,Sang-hee Hahn,Hyeon-Gon Lee,Soo Hwan Park,K.H. Kim,Jaesic Hong,Sulhee Baek,Myungkyu Kim,Taegu Lee,Sangil Lee,Y.S. Bae,Hirofumi Yonekawa,Jae-Hoon Choi,I.S. Hwang,Yong-Jae Kim,K.W. Cho,Y.M. Park,Jong-Su Kim,Jongha Lee,J.S. Bak,M. Kwon,G.S. Lee,J.G. Kwak,Hyun-Sik Ahn,M.L. Walker,D.A. Humphreys,J.A. Leuer,A.W. Hyatt,G.L. Jackson,D. Mueller,D.P. Ivanov +40 more
TL;DR: In this paper, the first plasma discharge in the KSTAR tokamak has been achieved without any severe failure preventing the device operation and plasma experiments, and the performance test of the superconducting magnet showed that the joint resistances were below 3 nΩ and the resistance to ground after cooling-down was over 1 GΩ.
Journal ArticleDOI
Novel rapid shutdown strategies for runaway electron suppression in DIII-D
Nicolas Jc Commaux,Larry R. Baylor,S.K. Combs,N.W. Eidietis,Todd Evans,C.R. Foust,Eric Hollmann,D.A. Humphreys,V.A. Izzo,A.N. James,T.C. Jernigan,Steven J. Meitner,Paul Parks,J.C. Wesley,J.H. Yu +14 more
TL;DR: In this paper, a new rapid shutdown strategy has been recently tested in the DIII-D tokamak to mitigate runaway electrons (REs) by applying a non-axisymmetric magnetic perturbation to worsen their confinement.