Effect of Finite Pulse Length and Laser Frequency Chirp on HGHG and EEHG Seeding

Stupakov, G.

SLAC National Accelerator Laboratory

关键词: Harmonic Generation;    Amplitudes;    99 General And Miscellaneous//Mathematics, Computing, And Information Science;    Modulation;    Seeds Accelerators,Accphy, Xfel;   

DOI  :  10.2172/1029478
RP-ID  :  SLAC-PUB-14639
RP-ID  :  AC02-76SF00515
RP-ID  :  1029478

美国|英语

来源: UNT Digital Library

【 摘 要 】

Theoretical studies of high-gain harmonic generation (HGHG) and echo-enabled harmonic generation (EEHG) often start from a simplified model in which the beam is assumed infinitely long and longitudinally uniform and the laser induced energy modulation is perfectly sinusoidal and of infinite duration. In such a model the resulting seed has a spectrum consisting of a collection of delta-functions (of zero width) located at the harmonics of the laser frequency. Being a useful tool for study of the seed bunching amplitudes, such a model cannot be used for realistic analysis the spectral properties of the seed. In this paper we take into account the finite duration of the laser pulse as well as some possible laser phase errors to study their effect on the spectrum of the seed.