Abstract
Generation of ultrashort coherent radiation pulses in the extreme ultraviolet (EUV) and x-ray regime is of remarkable interest in the synchrotron radiation user community. In this work, a novel technique is proposed for directly imprinting strong coherent microbunching on the electron beam with very small laser-induced energy spread. Theoretical analysis and numerical simulations demonstrated that this technique can be used for the generation of megawatt-scale level, fully temporal coherent femtosecond EUV and soft x-ray radiation pulses at a storage ring light source.
Highlights
The urgent need for intense ultrashort radiation pulses in the extreme ultraviolet (EUV) and x-ray region has prompted new developments of advanced accelerator-based light sources such as high-gain free-electron lasers (FELs)
It has been proposed that the frequency up-conversion efficiency of coherent harmonic generation (CHG) can be enhanced by using a seed laser operating at TEM01 mode to introduce an angular modulation into the electron beam[17]
The phase-merging enhanced harmonic generation (PEHG) has been proposed to improve the frequency up-conversion efficiency of the CHG18, a transverse-gradient undulator is typically needed in PEHG and it is found that the bunching factor of PEHG will be significantly decreased for a very small energy modulation due to the transverse-longitudinal phase space coupling during the modulation process
Summary
Generation of ultrashort coherent radiation pulses in the extreme ultraviolet (EUV) and x-ray regime is of remarkable interest in the synchrotron radiation user community. The urgent need for intense ultrashort radiation pulses in the extreme ultraviolet (EUV) and x-ray region has prompted new developments of advanced accelerator-based light sources such as high-gain free-electron lasers (FELs). Several EUV and x-ray FEL facilities were constructed worldwide and have been applied to diverse cutting edge researches[2,3,4,5] These high-gain FELs have met most criteria of future light sources, they usually have relatively low repetition rates and limited numbers of user beamlines. A substantial gain in photon flux can been achieved by using coherent harmonic generation (CHG) technique[8,9,10], which borrows the idea from seeded FELs to imprint coherent microbunching on the electron beam with external laser source to significantly enhance the output intensity and improve the temporal coherence. The bunching factor of CHG is given by[9]
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