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

S V Benson, L T Campbell, Brian McNeil, G R Neil, M D Shinn, G P Williams

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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).
Original languageEnglish
Article number012025
Pages (from-to)1-7
Number of pages7
JournalJournal of Physics Conference Series
Issue numberconference 1
Publication statusPublished - 2014


  • simulations
  • FIR oscillator
  • large slippage parameter
  • jefferson lab
  • FIR/UV
  • pump-probe experiments
  • dual FEL configuration
  • simultaneous lasing
  • diffraction-limited pulses
  • short wiggler

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