Effect of high slice energy spread of an electron beam on the generation of isolated, terawatt, attosecond X-ray free-electron laser pulse

被引：4

作者：

Shim, Chi Hyun ^{[1
]}

Parc, Yong Woon ^{[1
,2
]}

Kim, Dong Eon ^{[3
,4
]}

机构：

[1] Pohang Univ Sci & Technol, Pohang Accelerator Lab, Pohang 37673, South Korea

[2] Pohang Univ Sci & Technol, Div Adv Nucl Engn, Pohang 37673, South Korea

[3] Pohang Univ Sci & Technol, Dept Phys, Ctr Attosecond Sci & Technol, Pohang 37673, South Korea

[4] Max Planck POSTECH KOREA Res Init, Pohang 37673, South Korea

来源：

SCIENTIFIC REPORTS | 2020年 / 10卷 / 01期

基金：

新加坡国家研究基金会;

关键词：

AMPLIFIED SPONTANEOUS EMISSION; DYNAMICS;

D O I：

10.1038/s41598-020-57905-y

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Attosecond (asec) X-ray free-electron laser (XFEL) has attracted considerable interest over the past years. Nowadays typical XFEL application experiments demand 10(10)-10(11) photons per pulse, which corresponds to a peak power of terawatts (TW) in case of asec hard X-ray pulse. To the realization of such TW asec-XFEL pulse, however, the unavoidable increase of slice energy spread (SES) due to laser heater, which is commonly used to mitigate the micro-bunching instability (MBI), would be a major obstacle. To deal with this problem, the effect of such a SES is investigated in this work. The results reveal that (1) SES of a current spike is linearly proportional to the peak current of a current spike in an electron beam, (2) surprisingly, this linearity is independent of the wavelength of an energy modulation driving laser which is used to make a current spike and (3) the gain length of current spike in the undulator is sensitive to the initial SES, so there is an optimal peak current of the current spike for successful FEL lasing process. Utilizing these characteristics, a series of simulations with parameters for Pohang Accelerator Laboratory X-ray Free Electron Laser was carried out to demonstrate that an isolated, TW asec-XFEL pulse can be generated even when the SES is increased due to the usage of laser heater to prevent the MBI in the XFEL. We show that an isolated X-ray pulse with >1 TW and a pulse duration of 73 as (similar to 3 x 10(10) photons/pulse at 12.4 keV or 0.1 nm) can be generated by using ten current spikes with optimal peak current. It becomes clear for the first time that the disadvantage from the increased SES can be indeed overcome.

引用

页数：9

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