4,536 research outputs found
Two-dimensional model of intrinsic magnetic flux losses in helical flux compression generators
Helical Flux Compression Generators (HFCG) are used for generation of
mega-amper current and high magnetic fields. We propose the two dimensional
HFCG filament model based on the new description of the stator and armature
contact point. The model developed enables one to quantitatively describe the
intrinsic magnetic flux losses and predict the results of experiments with
various types of HFCGs. We present the effective resistance calculations based
on the non-linear magnetic diffusion effect describing HFCG performance under
the strong conductor heating by currents.Comment: 29 pages,18 figure
Simulation of an Axial Vircator
An algorithm of particle-in-cell simulations is described and tested to aid
further the actual design of simple vircators working on axially symmetric
modes. The methods of correction of the numerical solution, have been chosen
and jointly tested, allow the stable simulation of the fast nonlinear multiflow
dynamics of virtual cathode formation and evolution, as well as the fields
generated by the virtual cathode. The selected combination of the correction
methods can be straightforwardly generalized to the case of axially
nonsymmetric modes, while the parameters of these correction methods can be
widely used to improve an agreement between the simulation predictions and the
experimental data.Comment: 9 pages, 3 figure
Relativistic runaway electron breakdown and Terrestrial Gamma ray Flashes: GEANT4 simulation
Numerical simulation of a relativistic runaway electron breakdown in the
upper atmosphere is performed using GEANT4 simulation toolkit. General features
of a relativistic runaway electron avalanche are reconstructed and properties
of radiations accompanying breakdown are obtained. It is demonstrated
dependance of the high energy branch of photon spectra with respect to an
altitude and shown what at the reasonable parameters hard photons have spectral
index close to the observed value.Comment: 17 pages, 9 figure
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