Author/Authors :
Behre، نويسنده , , C and Benson، نويسنده , , S and Biallas، نويسنده , , G and Boyce، نويسنده , , J and Curtis، نويسنده , , C and Douglas، نويسنده , , D and Dylla، نويسنده , , H.F and Dillon-Townes، نويسنده , , L and Evans، نويسنده , , R and Grippo، نويسنده , , A and Gubeli، نويسنده , , J and Hardy، نويسنده , , D and Heckman، نويسنده , , J and Hernandez-Garcia، نويسنده , , C and Hiatt، نويسنده , , T and Jordan، نويسنده , , K and Merminga، نويسنده , , L and Neil، نويسنده , , G and Preble، نويسنده , , J and Rutt، نويسنده , , H and Shinn، نويسنده , , M and Siggins، نويسنده , , T and Toyokawa، نويسنده , , H and Waldman، نويسنده , , D.W and Walker، نويسنده , , R and Wilson، نويسنده , , N and Yunn، نويسنده , , B and Zhang، نويسنده , , S، نويسنده ,
Abstract :
We report initial lasing results from the IR Upgrade FEL at Jefferson Lab (Proceedings: 2001 Particle Accelerator Conference, IEEE, Piscataway, NJ, 2001). The electron accelerator was operated with low average current beam at 80 MeV. The time structure of the beam was 120 pC bunches at 4.678 MHz with up to 750 μs pulses at 2 Hz. Lasing was established over the entire wavelength range of the mirrors (5.5–6.6 μm). The detuning curve length, turn-on time, and power were in agreement with modeling results assuming a 1 ps FWHM micropulse. The same model predicts over 10 kW of power output with 10 mA of beam and 10% output coupling, which is the ultimate design goal of the IR Upgrade FEL. The behavior of the laser while the dispersion section strength was varied was found to qualitatively match predictions. Initial CW lasing results also will be presented.
