Results 221 to 230 of about 2,809 (264)

Hot electrons in one dimension: Electron velocity runaway

Physical Review B, 1987
The solution to the Boltzmann equation for optical-phonon scattering in one dimension, as obtained previously both without and with backscattering, is examined with regard to the question of electron velocity runaway. The results are in accord with previous work on this question, in that forward scattering (\ensuremath{\alpha}=0) leads to runaway above
, Canright, , Mahan
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Stability of a runaway electron beam

Nuclear Fusion, 1986
The paper studies the distribution function of a runaway electron beam with allowance for close collisions of fast tail electrons with thermal ones, as a result of which momentum is imparted to the latter sufficient for escape into a continuous acceleration regime. It is shown that a beam is formed which is not in equilibrium with respect to transverse
N.T. Besedin, I.M. Pankratov
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Runaway electrons in the SINP tokamak

Pramana, 2000
The experimental determination of the dependance of confinement time of runaways on various discharge parameters has been presented along with the angular distribution of hard X-rays (HXrays) emitted from the torus in presence and absence of Langmuir probes.
Ramesh Narayanan, A N Sekar Iyengar, R Pal   +2 more
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On the motion of runaway electrons in momentum space

Nuclear Fusion, 1979
The suprathermal drag force and the motion of suprathermal electrons in momentum space are analysed for a multi-component plasma. The calculations of the particle motion are based on the suprathermal Fokker-Planck equation and include relativistic effects.
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Pellet interaction with runaway electrons

Journal of Nuclear Materials, 2011
Abstract We describe results from recent experiments studying interaction of solid polystyrene pellets with a runaway electron current channel generated after cryogenic argon pellet rapid shutdown of DIII-D. Fast camera imaging shows the pellet trajectory and continuum emission from the subsequent explosion, with geometric calibration providing ...
A.N. James, E.M. Hollmann, J.H. Yu, M.E. Austin, N. Commaux, T. Evans, D.A. Humphreys, T.C. Jernigan, P.B. Parks, S. Putvinski, E.J. Strait, G.R. Tynan, J. Wesley   +12 more
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Parameters of a runaway electron avalanche

Physics of Plasmas, 2017
The features of runaway electron avalanches developing in air at different pressures are investigated using a three-dimensional numerical simulation. The simulation results indicate that an avalanche of this type can be characterized, besides the time and length of its exponential growth, by the propagation velocity and by the average kinetic energy of
E. V. Oreshkin, S. A. Barengolts, V. I. Oreshkin, G. A. Mesyats   +3 more
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Relativistic runaway electron avalanche

Uspekhi Fizicheskih Nauk, 2020
Abstract Discussed are the genesis of the concept of the relativistic runaway electron avalanche (RREA) and its mechanism as an analog of the Townsend’s avalanche, but capable of developing, unlike the latter, in weak thundercloud electric fields.
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A contribution to the problem of runaway electrons

Annals of Nuclear Energy, 1996
Abstract After giving a short sketch of the status of the field we treat two models of runaway in some detail. One is a Fokker-Planck equation, the other a kinetic equation with compact kernel. Both are 1-d models; both deal with the marginal case of ( 1 v ) relaxation of diffusion coefficient or reaction-rate.
Christianson, Kent, Corngold, Noel
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Theory of the Runaway Electron Tail

Physical Review Letters, 1977
The steady-state electron distribution function of a current-carrying magnetized plasma is determined self-consistenly with the enhanced $\ensuremath{\omega}=\frac{{\ensuremath{\omega}}_{\mathrm{pe}}{k}_{\ensuremath{\parallel}}}{k}$ plasma wave spectrum it generates. Consequences include enhanced fluctuations at $\ensuremath{\omega}\ensuremath{\simeq}{\
Kim Molvig, Miloslav S. Tekula, Abraham Bers   +2 more
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RUNAWAY ELECTRONS ON PLASMA FACING COMPONENTS

1993
Runaway electrons can cause severe damage to plasma facing components of large tokamaks. The designs proposed for the first wall and divertor of the next large fusion experiment, ITER (International Thermonuclear Experimental Reactor), are investigated. Energies of up to 300 MeV per electron and surface energy depositions of 30 MJ/m2 are assumed.
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