Ultra-high harmonic conversion of a seeded free-electron laser via harmonic optical klystron

被引：1

作者：

Wang, Xiaofan ^{[1
]}

Zeng, Li ^{[1
]}

Zhang, Weiqing ^{[2
]}

Yang, Xueming ^{[1
,2
,3
]}

机构：

[1] Inst Adv Sci Facil, Shenzhen 518107, Peoples R China

[2] Dalian Inst Chem Phys, Chinese Acad Sci, Dalian 116023, Peoples R China

[3] Southern Univ Sci & Technol, Shenzhen 518055, Peoples R China

来源：

PHYSICA SCRIPTA | 2024年 / 99卷 / 05期

基金：

中国国家自然科学基金;

关键词：

seeded FEL; ultra-high harmonic conversion; harmonic optical klystron; high repetition rate; GENERATION; RADIATION; OPERATION; FEL;

D O I：

10.1088/1402-4896/ad3783

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

External seeded free-electron lasers (FELs) are compelling tools for generating fully coherent EUV and soft x-ray radiations. Echo-enabled harmonic generation (EEHG), the most typical representative of external seeded FELs, has witnessed a remarkable growth of fully coherent FELs in the last decade, continuously evolving towards higher harmonic conversions and shorter wavelengths. Ultra-high harmonic generation is imperative in the field of FELs. This paper presents a novel method for generating FEL radiation with ultra-high harmonic conversion, utilizing harmonic optical klystron in combination with EEHG. This method can effectively increase the harmonic conversion order to about 90. Theoretical analysis and numerical simulations show that intense and almost fully coherent FEL pulses can be generated with a wavelength of 3 nm. At the same time, the seed laser intensity required by this scheme is lower compared to nominal EEHG, thus facilitating the generation of high-repetition-rate seeded FELs.

引用

页数：7

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