Accession Number : ADA186066

Title :   High Repetition Rate Electron Beam RF-Acceleration and Sub-Millimeter Wave Generation Via a Free Electron Laser.

Descriptive Note : Annual progress rept. 15 Aug 86-14 Aug 87,

Corporate Author : CALIFORNIA UNIV LOS ANGELES

Personal Author(s) : Luhmann, N C , Jr ; McDermott, D B

PDF Url : ADA186066

Report Date : 14 Aug 1987

Pagination or Media Count : 18

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.

Descriptors :   *ELECTROMAGNETIC PULSES, *FREE ELECTRON LASERS, ACCELERATED TESTING, CONTROL, ELECTRON GUNS, ELECTRONS, ENERGY, FREQUENCY, GAIN, INPUT, INTERACTIONS, LOSSES, OPTIMIZATION, PHASE, POWER, PULSES, RADIOFREQUENCY, SHORT PULSES, SOLENOIDS, SUBMILLIMETER WAVES, SYNCHRONISM, TRANSFER, TRAVELING WAVES, WAVE PROPAGATION

Subject Categories : Lasers and Masers

Distribution Statement : APPROVED FOR PUBLIC RELEASE