Accession Number : ADA257940


Title :   Electron Transit Time in Central Virtual Anode Wells


Corporate Author : ENERGY/MATTER CONVERSION CORP MANASSAS VA


Personal Author(s) : Bussard, Robert W ; King, Katherine E


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a257940.pdf


Report Date : Jan 1992


Pagination or Media Count : 12


Abstract : In the computation of electron residence time within the core cavity of Polywell(tm)/HEPS devices, it is necessary to determine the average time of transit of the electrons in the system across the system. This is needed in the EKXL code as a parameter in the basic code algorithm relating electron edge densities at successive time increments within each time interval computation. The time intervals are those periods over which the succession of linked steady- state solutions are obtained for particle density and potential distributions. An analogous parameter is required for the algorithm relating ion edge density dependence, as well. For ions, this parameter can be calculated readily from the data available in each code computation; simply summing the ratio of spatial grid width to local grid average radial speed, over the complete grid range characterizing the problem. This works effectively, even though the ions are specified with a square function energy distribution, because all of the ions go to or through the central core of the system. This is not the case for the electrons, however, as their radial and transverse energy spreads, coupled with the square distribution used to model these spreads, forces them to experience (in the computer code computation) a wide range of transit times.


Descriptors :   *COMPUTER PROGRAMS , *ELECTRON FLUX , *CONTROLLED NUCLEAR FUSION , *ANODES , SPATIAL DISTRIBUTION , CORES , TRAVEL TIME , EDGES , CHARGE DENSITY


Subject Categories : Computer Programming and Software
      Fusion Devices(thermonuclear)
      Plasma Physics and Magnetohydrodynamics


Distribution Statement : APPROVED FOR PUBLIC RELEASE