VIPER conductivity model. Memorandum report

Technical Report · Thu Apr 24 04:00:00 EST 1986

OSTI ID:5413033

Slinker, S P; Hubbard, R F

Beam-propagation codes such as the hose simulation code VIPER require simple models for treating the generation of conductivity by the beam pulse. The VIPER conductivity model calculates the electron density n/sub e/ (r,zeta,z) where zeta = ct-z is the distance from the beam head. The rate equation for n/sub e/ treats beam-impact ionization, avalanche ionization, and recombination. Rate coefficients and momentum-transfer frequency are functions of the electron temperature T/sub e/ which is itself estimated from the ratio of the local electric field to the neutral gas density. Since VIPER treats both monopole and dipole beam dynamics, the perturbed or dipole conductivity must also be calculated. Benchmark comparisons between the VIPER model and more-elaborate treatments of beam-generated conductivity are also presented.

• Research Organization: Naval Research Lab., Washington, DC (USA)
• OSTI ID: 5413033
• Report Number(s): AD-A-167134/6/XAB; NRL-MR-5777
• Country of Publication: United States
• Language: English

Related Subjects

640420* -- Fluid Physics-- Properties & Structure of Fluids-- (-1987)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BEAMS
COMPUTERIZED SIMULATION
ELECTRIC CONDUCTIVITY
ELECTRIC DISCHARGES
ELECTRIC FIELDS
ELECTRICAL PROPERTIES
ELECTRON BEAMS
ELECTRON DENSITY
ENERGY RANGE
IONIZATION
LEPTON BEAMS
PARTICLE BEAMS
PHYSICAL PROPERTIES
PULSES
RELATIVISTIC RANGE
SIMULATION
TOWNSEND DISCHARGE