Optical modeling of the Jefferson Laboratory IR demo FEL

George R. Neil; Stephen V. Benson; Michelle D. Shinn; Paul C. Davidson; Peter K. Kloeppel

doi:10.1117/12.273666

2 May 1997 Optical modeling of the Jefferson Laboratory IR demo FEL

George R. Neil, Stephen V. Benson, Michelle D. Shinn, Paul C. Davidson, Peter K. Kloeppel

Author Affiliations +

Proceedings Volume 2989, Modeling and Simulation of Higher-Power Laser Systems IV; (1997) https://doi.org/10.1117/12.273666
Event: Photonics West '97, 1997, San Jose, CA, United States

Abstract

The Thomas Jefferson National Accelerator Facility (formerly known as CEBAF) has embarked on the construction of a 1 kW free-electron laser operating initially at 3 microns that is designed for laser-material interaction experiments and to explore the feasibility of scaling the system in power and wavelength for industrial and Navy defense applications. The accelerator system for this IR demo includes a 10 MeV photocathode-based injector, a 32 MeV CEBAF-style superconducting radio-frequency linac, and single-pass transport which accelerates the beam from injector to wiggler, followed by energy-recovery deceleration to a dump. The electron and optical beam time structure in the design consists of a train of picosecond pulses at 37.425 MHz pulse repetition rate. The initial optical configuration is a conventional near-concentric resonator with transmissive outcoupling. Future upgrades of the system will increase the power and shorten the operating wavelength, and utilize a more advanced resonator system capable of scaling to high powers. The optical system of the laser has been modeled using the GLAD^R code by using a Beer's-law region to mimic the FEL interaction. Effects such as mirror heating have been calculated and compared with analytical treatments. The magnitude of the distortion for several materials and wavelengths has been estimated. The advantages as well as the limitations of this approach are discussed.

Citation Download Citation

George R. Neil, Stephen V. Benson, Michelle D. Shinn, Paul C. Davidson, and Peter K. Kloeppel "Optical modeling of the Jefferson Laboratory IR demo FEL", Proc. SPIE 2989, Modeling and Simulation of Higher-Power Laser Systems IV, (2 May 1997); https://doi.org/10.1117/12.273666

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