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

Stupakov, G. ; /SLAC

关键词: AMPLITUDES;    HARMONIC GENERATION;    HARMONICS;    LASERS;    MODULATION;    SEEDS Accelerators;    ACCPHY;    XFEL;   

DOI  :  10.2172/1029478
RP-ID  :  SLAC-PUB-14639
PID  :  OSTI ID: 1029478
Others  :  TRN: US201201%%140

学科分类：社会科学、人文和艺术（综合）

美国|英语

来源: SciTech Connect

【 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.