Accession Number : ADA192451

Title :   Regions of Stability of FEL Oscillators,

Corporate Author : MARYLAND UNIV COLLEGE PARK LAB FOR PLASMA AND FUSION ENERGY STUDIES

Personal Author(s) : Levush, B ; Antonsen, T M , Jr

PDF Url : ADA192451

Report Date : Oct 1987

Pagination or Media Count : 14

Abstract : The stability of single mode operation of FEL oscillators is investigated. We consider two models of an untapered FEL oscillator. The first model is called the klystron model. In it the FEL interaction occurs at two points: a prebunching point and an energy extraction point. In this model the nonlinear electron dynamics are solvable exactly leading to a complex delay equation for the wave fields. The stability of single mode operation can then be determined easily as a function of single pass gain, energy mismatch-frequency, and the difference between the group velocity of the radiation and the beam velocity. The second, more realistic model has a distributed interaction region of finite length. Stability of single mode operation in this device must be determined numerically. The results of the models in low gain regime will be compared and the parameter regimes where stable single mode operation is possible will be determined.

Descriptors :   *OSCILLATORS, DELAY, DISTRIBUTION, ELECTRODYNAMICS, ENERGY, EQUATIONS, EXTRACTION, GAIN, INTERACTIONS, KLYSTRONS, LOW LEVEL, MODELS, NONLINEAR SYSTEMS, OPERATION, PARAMETERS, REGIONS, STABILITY, VELOCITY, WAVES

Subject Categories : Lasers and Masers

Distribution Statement : APPROVED FOR PUBLIC RELEASE