Most documents available from AIAA Technical Library Journal Announcement: IAA8510 The nonlinear evolution of Raman free-electron lasers in the presence of an axial guide-field is investigated numerical1y in an amp1ifier configuration. The non1inear curre n t s wh ich mediate the interact!on are computed by means of an average over partic1e phases, and the inc1usion of fluctuating space-charge fields in the formulation permits the investigation of both the st i mulated Raman and Compt on scattering regimes. Initial conditions are chosen to describe the injection of a monoenergetic beam into the interaction region composed of a uniform axial guide field and a helical wiggler field which increases adiabatically to a constant level. After an initial transient phase, the results show a region of exponential growth of the radiation field which is in excellent agreement with linear theory. Saturation occurs by means of particle trapping. The efficiency of the interaction has been studied for a wide range of axial guide fields, and substantial enhancements have been found relative t o the zero-gui de-fi e1d 1im i t. (Aut h or) Sour c e of Abstract (S ubfile): AI AA/TIS Keywords: *FREE ELECTRON LASERS; *MAGNETIC EFFECTS; *RAMAN LASERS; ENERGY CONVERSION EFFICIENCY; FIELD STRENGTH; NONLINEAR EVOLUTION EQUATIONS ; SYSTEMS SIMULATION; WIGGLER MAGNETS Subject Classification; 7536 Lasers & Masers (1975-) Effects of gain displacements on a tapered wiggler free- electron laser. BHOWMIK, A.; COVER, R. A. (Rockwell International Corp., Rocketdyne Div. , Canoga Park , CA) IN: Free-electron generators of coherent radiation; Proceedings of the Meeting, Orcas Island, WA, June 26- July 1, 1983 (A85-25285 10-36). Bellingham, WA, SPIE The International Society for Optical Engineering, 1984, p. 218—226. 10 R e f s» Lan g uage: English. Country of Origin: United States. Country of Publication: United States Document Type: C0NFERENCE PAPER Most documents available from AIAA Technical Library Journa1 Announcement: IAA 8510 The performance of a low gain, free-electron laser (FEL) operating in the Compton regime is evaluated in the presence of e-beam disp1acements in planes para11e1 or perpendi cul ar to the FEL linearly polarized wiggler- magnetic field. In this fully coupled, nonlinear formalism, the gain is described by a 3-D extension of the Krol 1-Morton-Rosenbluth (KMR) equations and evaluated by usi ng opt i cal fields that are pr opagated numeri ca11y between sections of the wiggler (and the oscillator) using the Gardner-Fresnel-Kirchhoff (GFK) algorithm. The oscillator extraction efficiency, optical gain, and the? 3-D transverse? mode and gain distributions are computed in the absence of slippage between the optical and e-beam pulses, using standard iterative techniques for obtaining resonator solutions.
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