Further Investigations Using the NEUTRAL Code
NAVAL RESEARCH LAB WASHINGTON DC
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Some applications of the NEUTRAL code, as discussed in a previous report, are considered. NEUTRAL was run with an energy dependent cross section and the results were compared to the analytical expressions of Prono et al. Good agreement exists between these two approaches. A parameter study was done to see how the neutral energy varied with the background gas width. It was determined if one knew the cross sections exactly, then from measurements of the average neutral energy, one could infer an average gas width. Neutral was also modified to model a linearly time rising electric field, which is a closer representation to the actual operation of a reflex switch. It was found that the average neutral energy seems to increase linearly in time as well. A comparison is also made to a simple quasistatic model and only limited agreement is shown to occur. Discussion on the need to include a time rising current density is presented and it is mentioned that future work is being focused on this program.
- Particle Accelerators