Zobrazeno 1 - 10
of 48
pro vyhledávání: '"David Pace"'
Autor:
David Pace, Rebecca Masline, J.G. Watkins, Auna Moser, J.L. Barton, Daniel Thomas, Igor Bykov, Andreas Wingen, Houyang Guo, Huiqian Wang
Publikováno v:
Nuclear Materials and Energy, Vol 18, Iss, Pp 46-49 (2019)
We report measurements of a+/− 5 mm toroidal variation of the outer strike point radial position using an array of three identical Langmuir probes distributed at 90° intervals around the torus (90°, 180°, 270°). The strike point radial location
Publikováno v:
IEEE Transactions on Plasma Science. 46:1102-1107
A significant engineering upgrade of the DIII-D neutral beam system has recently completed, providing ability to smoothly and independently vary the beam voltage and current. This enables greater control of the injected beam power, torque, and plasma
Autor:
J. T. Scoville, David Pace, Brendan M. Crowley, Robert D. Johnson, D.H. Kellman, C.J. Pawley, J. Rauch
Publikováno v:
Fusion Science and Technology. :1-5
On the DIII-D National Fusion Facility tokamak plasma diagnostics continue to improve and experiments increase in complexity. Hence the utility of dynamic control of the beam energy (and therefore also the injected torque, ion heating fraction, etc.)
Publikováno v:
Fusion Engineering and Design. 112:14-20
Neutral beam prompt losses (injected neutrals that ionize such that their first poloidal transit intersects with the wall) can put appreciable power on the outer wall of tokamaks, and this power may damage the wall or other internal components. These
Publikováno v:
The Review of scientific instruments. 89(10)
The Ion Cyclotron Emission (ICE) diagnostic on the DIII-D tokamak consists of two outboard midplane systems. In the first system, straps of an ion cyclotron range of frequencies antenna are configured as receiving antennas. For the second system, ded
Autor:
M. A. Van Zeeland, Christopher Holland, T. L. Rhodes, Choongki Sung, C.C. Petty, Kathreen Thome, David Pace, Sterling Smith, G. J. Kramer, Joseph McClenaghan, Long Zeng, Y. B. Zhu, Francesca Turco, Brian Grierson, Xiaodi Du, G.R. McKee, M. Knolker
Publikováno v:
Nuclear Fusion. 61:036036
The thermal and fast-ion transport properties of DIII-D steady-state hybrid discharges with normalized beta β N ≳ 3 are studied at low injected torque and an increased electron to ion temperature ratio T e/T i. Linear stability analysis performed
Publikováno v:
Physics Today. 68:34-39
Interactions between electromagnetic waves and the most energetic ions in a plasma can perturb the orbits of those ions enough to expel them from the confining magnetic field.
Autor:
Carlos Paz-Soldan, David Pace, P. Aleynikov, R. A. Moyer, N.W. Eidietis, Chang Liu, Daisuke Shiraki, Eric Hollmann, Andrey Lvovskiy, Dylan Brennan, C. M. Cooper
Publikováno v:
Physics of Plasmas
Areas of agreement and disagreement with present-day models of runaway electron (RE) evolution are revealed by measuring MeV-level bremsstrahlung radiation from runaway electrons (REs) with a pinhole camera. Spatially resolved measurements localize t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a60eed102729482c43021c2dee781bb7
https://hdl.handle.net/21.11116/0000-0002-9731-C21.11116/0000-0000-F42A-E21.11116/0000-0000-F42C-C
https://hdl.handle.net/21.11116/0000-0002-9731-C21.11116/0000-0000-F42A-E21.11116/0000-0000-F42C-C
Autor:
N.W. Eidietis, R.A. Moyer, David Pace, P. Aleynikov, Eric Hollmann, Daisuke Shiraki, Robert Granetz, Andrey Lvovskiy, Dylan Brennan, C. M. Cooper, Chang Liu, Carlos Paz-Soldan
Publikováno v:
Physical Review Letters
Novel spatial, temporal, and energetically resolved measurements of bremsstrahlung hard-x-ray (HXR) emission from runaway electron (RE) populations in tokamaks reveal nonmonotonic RE distribution functions whose properties depend on the interplay of
Autor:
Daisuke Shiraki, Carlos Paz-Soldan, Eric Hollmann, C. M. Cooper, David Pace, Nicolas Jc Commaux, N.W. Eidietis
Publikováno v:
The Review of scientific instruments. 87(11)
A new gamma ray imager (GRI) is developed to probe the electron distribution function with 2D spatial resolution during runaway electron (RE) experiments at the DIII-D tokamak. The diagnostic is sensitive to 0.5-100 MeV gamma rays, allowing character