Simulations of a FIR Oscillator with Large Slippage parameter at Jefferson Lab for FIR/UV pump-probe experiments

17th Pan-American Synchrotron Radiation Instrumentation Conference

Benson, S.V.^2 ; Campbell, L.T.^1,3 ; McNeil, B.W.J.^1 ; Neil, G.R.^2 ; Shinn, M.D.^2 ; Williams, G.P.^2

Department of Physics, University of Strathclyde, Glasgow G4 0NG, United Kingdom^1

Thomas Jefferson National Accelerator Facility, Newport News, VA 23606, United States^2

AsTeC, STFC Daresbury Laboratory, Cockcroft Institute, Warrington WA4 4AD, United Kingdom^3

关键词: Diffraction-limited pulse;    Energy spreads;    Jefferson Lab;    Pulse energies;    Pump-probe experiments;    Simultaneous lasing;    Slowly varying envelope approximation;    UV wavelength;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/493/1/012025/pdf
DOI  :  10.1088/1742-6596/493/1/012025

来源: IOP

【 摘 要 】

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).