Portal de Periódicos da CAPES

Performance of the accelerator driver of Jefferson Laboratory's free-electron laser

2003; Linguagem: Inglês

10.1109/pac.1999.792721

C.L. Bohn, S. Benson, G. Biallas, I.E. Campisi, D. Douglas, Robin J. Evans, J. Fugitt, Richard S. Hill, K. Jordan, Geoffrey Krafft, Richard Chi‐Hsi Li, L. Merminga, George Neil, P. Piot, J. Preble, Michelle D. Shinn, T. Siggins, Robert L. Walker, B. Yunn,

Laser Design and Applications

The driver for Jefferson Lab's kW-level infrared free-electron laser (FEL) is a superconducting, recirculating accelerator that recovers about 75% of the electron-beam power and converts it to radiofrequency power. In achieving first lasing, the accelerator operated "straight-ahead" to deliver 38 MeV, 1.1 mA cw current through the wiggler for lasing at wavelengths in the vicinity of 5 /spl mu/m. Just prior to first lasing, measured rms beam properties at the wiggler were 7.5/spl plusmn/1.5 mm-mr normalized transverse emittance, 26/spl plusmn/7 keV-deg longitudinal emittance, and 0.4/spl plusmn/0.1 ps bunch length which yielded a peak current of 60/spl plusmn/15 A. The waste beam was then sent directly to a dump, bypassing the recirculation loop. Stable operation at up to 311 W cw was achieved in this mode. Commissioning the recirculation loop then proceeded. As of this Conference, the machine has recirculated cw average current up to 4 mA, and has lased cw with energy recovery up to 710 W.