Author/Authors :
Nguyen، نويسنده , , D.C. and Gierman، نويسنده , , S.M. and Goldstein، نويسنده , , J.C. and Kinross-Wright، نويسنده , , J.M. and Kong، نويسنده , , S.H. and Plato، نويسنده , , J.G. and Russell، نويسنده , , S.J. and Sheffield، نويسنده , , R.L. and Sigler، نويسنده , , F.E. and Sherwood، نويسنده , , B.A. and Weber، نويسنده , , M.E. and Ziomek، نويسنده , , C.، نويسنده ,
Abstract :
The Advanced Free Electron Laser (AFEL) is a compact, infrared, rf-linac FEL that uses a high-brightness photoinjector and a short-period permanent-magnet wiggler. Lasing at saturation with and without sidebands was achieved over the 4–6 μm region with a nominally 15-MeV electron beam energy and a 1-cm-period, 24-period wiggler. Sideband-free FEL operation was optimized with respect to outcoupling by tuning off the reflectivity curve of the multilayer dielectric mirrors. Sideband operation was achieved using copper mirrors with a 1.1% outcoupling hole. The measured macropulse energy with ∼ 1300 micropulses was approximately 50 mJ per 1 nC of beam, corresponding to an output efficiency of 0.25% and a maximum extraction efficiency of 1.4%.
