Calculations of the Formation and Transport of High Quality, High Current Relativistic Electron Beams.
Abstract
This report reviews the results of calculations of the formation had transport of high quality, high current relativistic electron beams. To have a well behaved injector diode without significant diode closure during the beam pulse, it is necessary to have a large area cathode with a wide anode cathode gap spacing. Introduction of electrodes to control the equipotential grading in the A-K gap was found to allow the formation and injection of a high quality, laminar, covergent beam into the Long Pulse Induction Linac (LPIL) transport system. By exercising a one-dimensional beam envelope code and a steady state, two dimensional beam transport code, it was possible to obtain transport coil current settings to minimize current loss through the complex beam transport system. However, radial expansions and abrupt contraction in the conducting walls plus strong axial acceleration in the induction gaps of the accelerator were found to introduce perturbations to the radial beam forces which drive oscillations in the beam envelope. The largest radial oscillations were excited when the beam was injected into a strong solenoidal magnetic field to compress its size by order of magnitude prior to transport into an FEL wiggler.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1986
- Accession Number
- ADA174586
Entities
People
- Barry N. Moore
- J. R. Uglum
- James R. Thompson
- M. L. Sloan