Experimental Studies of Autoacceleration Concepts.
Rept. for 14 Mar 80-14 Mar 81,
JAYCOR ALEXANDRIA VA
Pagination or Media Count:
A long pulse intense electron beam propagating in a strong axial magnetic field has been studied. Significant electrostatic neutralization f sub c about 0.5 has been observed with electrostatic probes and the presence of an ion background at the end of the pulse verified by magnetic spectrometer experiments. The drift tube wall is being bombarded by energetic electrons and ions during the beam risetime and these electrons and ions fluxes may provide the ions at the wall necessary to neutralize the beam. A model has been developed which explains the ion bombardment during the beam pulse. The source of the electron flux to the wall of the drift tube appears to be from the end of the tube with electrons inside the drift tube rapidly diffusing radially to the wall over the entire length of the experiment. The magnitude of the electron flux is strongly influenced by the material used to dump the beam and the geometry of the beam dump.
- Particle Accelerators