Results 251 to 260 of about 23,746 (299)

Runaway electrons in a tokamak: A free-electron maser

Physical Review E, 1997
In ohmic divertor plasma discharges of the ASDEX upgrade tokamak containing a small population of runaway electrons, fluctuating emission in the microwave region with a very narrow bandwidth is observed. The radiation can be explained by relativistic runaway electrons, which are captured in a ripple resonance of the tokamak and are thus made ...
Kurzan, B., Steuer, K.
openaire   +3 more sources

Runaway electrons in plasma current sheets

Physical Review Letters, 1994
It is shown that a runaway electron population accelerates along the main magnetic field in a Sweet-Parker current sheet. After a characteristic distance the entire current is carried by runaways. The thickness of this runaway sheet is much smaller than the original Ohmic sheet. The influence of microinstabilities is discussed.
, Gurevich, , Sudan
openaire   +2 more sources

Impact of runaway electrons

Fusion Engineering and Design, 1994
Abstract 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-CDA (International Thermonuclear Experimental Reactor - Conceptual Design Activities) are investigated.
openaire   +3 more sources

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
openaire   +2 more sources

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
openaire   +1 more source

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
openaire   +1 more source

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
openaire   +2 more sources

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
openaire   +1 more source

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.
openaire   +2 more sources

Runaway electrons in the ORMAK device

Nuclear Fusion, 1974
Runaway electron currents of up to 140 kA with energies in the MeV-range and lasting for a tenth of a second have been observed in ORMAK. A theory which predicts the production and acceleration of these electrons is presented and compared with recent experimental results. Agreement between the two appears to be good.
D.A. Spong, J.F. Clarke, J.A. Rome, T. Kammash   +3 more
openaire   +1 more source