Investigations of Laser Initiated Discharge Channels.
Abstract
We report progress on the generation of intense, microsecond, electron beams. Diode closure has been studied for electron beam pulselengths up to 4 microseconds. Reduced density channels produced by laser induced gas breakdown and by laser guided discharges are modelled by means of a one dimensional gas hydrodynamics code for times earlier than the onset of convective mixing. Comparison of laser induced gas breakdown experiments with the code indicate that the conversion of laser energy to gas heating is limited to 25-30%. Collinear holographic measurements of channel density profiles produced by laser guided discharges are found to be in good agreement with code predictions for times less than 50 s. This agrees with other experiments which have indicated onset times for convective mixing in the range 50-70 microsec. after the start of the discharge. A Monte Carlo Fokker Planck code is used to investigate the scattering loss of particles from a relativistic electron beam propagating in a low pressure air channel.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 19, 1985
- Accession Number
- ADA158872
Entities
People
- R. M. Gilgenbach
- T. Kammash
Organizations
- University of Michigan