With the stat-of-the-art laser technique, the quality of electron beam generated from LPA （laser-plasma accelerator） is now becoming much better. The natural merits of electron beam from LPA, e.g., high peak current...With the stat-of-the-art laser technique, the quality of electron beam generated from LPA （laser-plasma accelerator） is now becoming much better. The natural merits of electron beam from LPA, e.g., high peak current, ultra-low emittance and ultra-short bunch length, etc., pave the way to the novel light sources, especially in the realm of developing much more compact x-ray light sources, e.g., table-top XFEL （x-ray free-electron laser）. However, the radiation power is limited by the rather larger energy spread than conventional radio-frequency electron LINAC （linear accelerator）. Luckily, much more power could be extracted by using the undulator with transverse gradient when energy spread effect could be compensated. In this paper, we introduce a novel soit x-ray light source driven by LPA together with TGU （transverse gradient undulator） technique, meanwhile we present a simple idea on how to achieve much higher rep-rate （e.g., -100 kHz） FELs （free-electron lasers） boosted by TGU based on storage rings.展开更多
Cascading stages of seeded free electron lasers（FELs） is a promising way to produce fully coherent X-ray radiation. We study a new approach to produce coherent hard X-rays by cascading the recently proposed phasemer...Cascading stages of seeded free electron lasers（FELs） is a promising way to produce fully coherent X-ray radiation. We study a new approach to produce coherent hard X-rays by cascading the recently proposed phasemerging enhanced harmonic generation（PEHG） The scheme consists of one dogleg and two PEHG configurations,and may be one of the leading candidates for the extracted undulator branch in future X-ray FEL facilities. FEL physics studies show that such a scheme is feasible within the present technology and can provide high brightness Xray radiation pulses with narrow bandwidth and full coherence The radiated peak power at 1 ？A wavelength converted from an initial 200 nm seed laser is over 2 GW展开更多
基金The authors would like to thank Huang, Z., and Ding, Y. from SLAC and Feng, C., Deng, H., Lan, T., Shen, L., Wang, X. and Liu, B. from SINAP for helpful discussions. The authors are grateful for the support of Major State Basic Research Development Program of China （No. 2011CB808300）, and Natural Science Foundation of China （No. 11075199）.
文摘With the stat-of-the-art laser technique, the quality of electron beam generated from LPA （laser-plasma accelerator） is now becoming much better. The natural merits of electron beam from LPA, e.g., high peak current, ultra-low emittance and ultra-short bunch length, etc., pave the way to the novel light sources, especially in the realm of developing much more compact x-ray light sources, e.g., table-top XFEL （x-ray free-electron laser）. However, the radiation power is limited by the rather larger energy spread than conventional radio-frequency electron LINAC （linear accelerator）. Luckily, much more power could be extracted by using the undulator with transverse gradient when energy spread effect could be compensated. In this paper, we introduce a novel soit x-ray light source driven by LPA together with TGU （transverse gradient undulator） technique, meanwhile we present a simple idea on how to achieve much higher rep-rate （e.g., -100 kHz） FELs （free-electron lasers） boosted by TGU based on storage rings.
基金Supported by the National Natural Science Foundation of China(21127902&11322550)Ten Thousand Talent Program
文摘Cascading stages of seeded free electron lasers（FELs） is a promising way to produce fully coherent X-ray radiation. We study a new approach to produce coherent hard X-rays by cascading the recently proposed phasemerging enhanced harmonic generation（PEHG） The scheme consists of one dogleg and two PEHG configurations,and may be one of the leading candidates for the extracted undulator branch in future X-ray FEL facilities. FEL physics studies show that such a scheme is feasible within the present technology and can provide high brightness Xray radiation pulses with narrow bandwidth and full coherence The radiated peak power at 1 ？A wavelength converted from an initial 200 nm seed laser is over 2 GW
