Accession Number:

ADA220750

Title:

Collective Free Electron Laser Theory

Descriptive Note:

Final rept. 30 Oct 1985-30 Jul 1986

Corporate Author:

BERKELEY RESEARCH ASSOCIATES INC CA

Personal Author(s):

Report Date:

1988-08-01

Pagination or Media Count:

51.0

Abstract:

The long-pulse induction linac is considered for the first stage of a two-stage free electron laser FEL oscillator. This research effort studies several effects that can significantly influence the performance of such an FEL. The FEL is parameterized in a set of dimensionless variables that can summarize several physical effects without the use of detailed calculation as well as relating the physical to other FEL designs. A waveguide analysis shows the primary modifications on the FEL interaction, electron beam distribution functions representing energy spread and emittance are evaluated in the high gain regime, and a multimode analysis of the trapped-particle instability is performed for parameters describing the FEL. The research in intended to extend the simulation theory of high-gain FEL oscillators. In the two-stage FEL, the first-stage uses a normal FEL interaction with the usual static undulator to produce an intense electromagnetic wave in a high-power resonator. The wavelength in the first stage is around 1 cm, and provides the periodic undulator in the second stage of the interaction. The electromagnetic undulator has a shorter wavelength with a more intense field than can be attained from a static magnetic field, and allows the second stage to reach short optical wavelengths with a low energy electron beam.

Subject Categories:

  • Lasers and Masers
  • Particle Accelerators

Distribution Statement:

APPROVED FOR PUBLIC RELEASE