G
G. M. Gammel
Researcher at Princeton Plasma Physics Laboratory
Publications - 15
Citations - 555
G. M. Gammel is an academic researcher from Princeton Plasma Physics Laboratory. The author has contributed to research in topics: Beam (structure) & Tokamak. The author has an hindex of 9, co-authored 15 publications receiving 547 citations.
Papers
More filters
Journal ArticleDOI
Magnetic field pitch-angle measurments in the PBX-M tokamak using the motional Stark effect.
TL;DR: Polarimetry measurements of the Doppler-shifted H{sub {alpha}} emission from a neutral hydrogen beam on the PBX-M tokamak have been employed in a novel technique for obtaining {ital q}({ital r}) and magnetic field pitch-angle profiles using the Stark effect.
Journal ArticleDOI
Magnetic field pitch angle diagnostic using the motional Stark effect (invited)
TL;DR: In this article, the motional Stark effect was employed in a novel technique for obtaining the pitch angle profile and q(r) using polarimetry measurements of the Doppler shifted Hα emission from a hydrogen diagnostic neutral beam.
Journal ArticleDOI
Effects of High-Power Ion Bernstein Waves on a Tokamak Plasma
Masayuki Ono,P. Beiersdorfer,R. E. Bell,S. Bernabei,A. Cavallo,A. Chmyga,Samuel A. Cohen,P. Colestock,G. M. Gammel,G. J. Greene,J. C. Hosea,Robert Kaita,I. Lehrman,G. Mazzitelli,E. Mazzucato,D. McNeill,K. Sato,J. Stevens,J. Timberlake,James R. Wilson,A. Wouters +20 more
TL;DR: Ion Bernstein wave heating (IBWH) has been investigated on PLT with up to 650 kW of rf power coupled to the plasma, exceeding the ohmic power of 550 kW.
Journal ArticleDOI
Measurements of neutral beam species, impurities, spatial divergence, energy dispersion, pressure, and reionization using the TFTR U.S. Common Long Pulse Ion Source
H.W. Kugel,G. M. Gammel,L. R. Grisham,R. Kaita,J. H. Kamperschroer,R. A. Langley,Charles W. Magee,S. S. Medley,Thomas J. Murphy,A. L. Roquemore,M. D. Williams +10 more
TL;DR: In this paper, the first comprehensive and complementary measurements using the final production U.S. Common Long Pulse Ion Sources mounted on both the TFTR neutral beam test beamline and the TF TR neutral beam injection system, with actual tokamak experimental conditions, power systems, controls, and operating methods were given.
Journal ArticleDOI
TFTR neutral beam injected power measurement
J. H. Kamperschroer,L. R. Grisham,L. Dudek,G. M. Gammel,G. A. Johnson,H.W. Kugel,L. Lagin,T. E. O’Connor,P. A. Shah,P. Sichta,T. N. Stevenson,A. von Halle,M. D. Williams,R. Bastasz +13 more
TL;DR: In this paper, a waterflow calorimetry system was used to measure the energy flow within TFTR neutral beamlines, and a 30% discrepancy was observed between energy measurements on the internal beamline calorimeter and energy measurements located in the test stand target chamber.