High Repetition Rate Electron Beam RF-Acceleration and Sub-Millimeter Wave Generation Via a Free Electron Laser.
Abstract
Short electron pulses can even enhance Free Electron Lasers gain. First-order effects become dominant as the spatial extent of the electron pulse becomes much shorter than the radio frequency wavelength. A buncher cavity between the electron gun and accelerator can improve the quality of the accelerated beam. The buncher has two adjustable parameters, the input power and its phase with respect to the accelerator. The input power determines the bunching parameter, which is a measure of the extent of bunching. The buncher cavity's phase controls the phase at which the electron pulses enter the accelerator and thus far their final energy. In any Travelling Wave Interactions half of the beam gains energy while the other half loses energy. For synchronism of the beam with the wave the two terms exactly cancel and there is no net power transfer. Energy loss dominates gain when the beam is properly mistuned from synchronism. The enhancement scheme for the Cyclotron Autoresonant Maser, recognized as appropriate for any TWI, is to effectively suppress the electrons which are phased to gain energy by using the gyro-resonant properties of a FEL wiggler. This enhancement wiggler is distinct from the FEL wiggler. Experiment: Enhancement of Travelling Wave Gain; Solenoid; Accelerator; Harmonic Catcher.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 14, 1987
- Accession Number
- ADA186066
Entities
People
- D. B. Mcdermott
- N. C. Luhmann Jr.
Organizations
- University of California, Los Angeles