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Simulations of a FIR oscillator with large slippage parameter at jefferson lab for FIR/UV pump-probe experiments

Benson, S V and Campbell, L T and McNeil, Brian and Neil, G R and Shinn, M D and Williams, G P (2014) Simulations of a FIR oscillator with large slippage parameter at jefferson lab for FIR/UV pump-probe experiments. Journal of Physics Conference Series, 493 (confer). pp. 1-7. ISSN 1742-6596

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Abstract

We previously proposed a dual FEL configuration on the UV Demo FEL at Jefferson Lab that would allow simultaneous lasing at FIR and UV wavelengths [1]. The FIR source would be an FEL oscillator with a short wiggler providing diffraction-limited pulses with pulse energy exceeding 50 microJoules, using the exhaust beam from a UVFEL as the input electron beam. Since the UV FEL requires very short pulses, the input to the FIR FEL is extremely short compared to a slippage length and the usual Slowly Varying Envelope Approximation (SVEA) does not apply. We use a non-SVEA code [2] to simulate this system both with a small energy spread (UV laser off) and with large energy spread (UV laser on).