FEL GAIN LENGTH AND TAPER MEASUREMENTS AT LCLS

Conference · Fri Aug 14 00:00:00 EDT 2009

OSTI ID:973380

Ratner, D; Fawley, W M; Brachmann, A; Decker, F J; Ding, Y; Dowell, D; Emma, P; Frisch, J; Gilevich, S; Hays, G; Hering, P; Huang, Z; Loos, H; Miahnahri, A; Nuhn, H D; Turner, J; Welch, J; White, W; Wu, J; Xiang, D ; Yocky, G; Fawley, W M

We present experimental studies of the gain length and saturation power level from 1.5 nm to 1.5 Angstroms at the Linac Coherent Light Source (LCLS). By disrupting theFEL process with an orbit kick, we are able to measure the X-ray intensity as a function of undulator length. This kick method is cross-checked with the method of removing undulator sections. We also study the FEL-induced electron energy loss after saturation to determine the optimal taper of the undulator K values. The experimental results are compared to theory and simulations.

• Research Organization: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
• Sponsoring Organization: Accelerator& Fusion Research Division
• DOE Contract Number: DE-AC02-05CH11231
• OSTI ID: 973380
• Report Number(s): LBNL-2537E
• Resource Relation: Conference: 31st International Free Electron Laser Conference, Liverpool, UK, 23-28 August 2009
• Country of Publication: United States
• Language: English

Related Subjects

43
Free-electron Laser
SASE
tapered undulators
LCLS