Title :
Commissioning of TTF2 Bunch Compressor for the Femtosecond (FS) FEL Mode Operation
Author :
Yujong Kim ; Son, Dongchul ; Kim, Y.
Author_Institution :
TTF2 VUV-FEL team, DESY, D-22603 Hamburg, Germany, E-Mail: Yujong.Kim@DESY.de
Abstract :
By the help of nonlinearity in the longitudinal phase space, the VUV-FEL at the TESLA Test Facility phase 2 (TTF2) is under operating in the femtosecond (fs) FEL mode which generates coherent and ultra-bright SASE source with photon pulse duration time of around 20 fs (FWHM) and wavelength of around 32 nm. For the fs FEL mode operation, bunch length of electron beams should be compressed by two bunch compressors to have a leading spike in the longitudinal beam density distribution or peak current. The required peak current at the spike is higher than about 1.0 kA, and the spike length is shorter than around 200 fs (FWHM). In this paper, we describe our commissioning experiences to optimize two TTF2 bunch compressors for the fs FEL mode operation.
Keywords :
Acceleration; Delay; Electron beams; Length measurement; Linear particle accelerator; Magnetic heads; Pulse generation; Radio frequency; Test facilities; Undulators;
Conference_Titel :
Particle Accelerator Conference, 2005. PAC 2005. Proceedings of the
Print_ISBN :
0-7803-8859-3
DOI :
10.1109/PAC.2005.1590635
