Accession Number : ADA257688


Title :   Ion Loss by Collisional Upscattering


Corporate Author : ENERGY/MATTER CONVERSION CORP MANASSAS VA


Personal Author(s) : Rosenberg, Marlene ; Krall, Nicholas A


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a257688.pdf


Report Date : 20 Jan 1991


Pagination or Media Count : 15


Abstract : In at least one idealized version of the Polywell (tm)/SCIF (spherically Convergent Ion Focus) fusion scheme, the ions are injected at a point xo such that the magnetic field is sufficiently reduced from its maximum value that the ion orbits are nearly straight lines as they converge to the center of the device. Typically, this location will have a B-field in the range of 100 Gauss, compared to a B max of several kG. This convergence in a strong potential produces a highly non-Maxwellian ion distribution, with a small dense core of nearly monoenergetic ions surrounded by a large mantle of less dense plasma made up of ions whose velocity is primarily radial. There are two very distinct effects that collisions have on ion confinement. Firstly, as the ions pass through the geometric center of the device, collisional processes will alter their velocity distribution from nearly monoenergetic to Maxwellian. Secondly, as the ions traverse the mantle of lower density plasma outside the core, collisions can transfer momentum from primarily radial flow, which produces good spherical convergence, to a more isotropic distribution of velocities.


Descriptors :   *IONS , *SCATTERING , VELOCITY , MAGNETIC FIELDS , DISTRIBUTION , CONVERGENCE , DIFFUSION , PARTICLE COLLISIONS , RADIAL FLOW , ANGULAR MOMENTUM , LOSSES , PLASMAS(PHYSICS) , CORES , ORBITS , DENSITY


Subject Categories : Electricity and Magnetism
      Atomic and Molecular Physics and Spectroscopy
      Particle Accelerators


Distribution Statement : APPROVED FOR PUBLIC RELEASE