Soft X-ray harmonic lasing self-seeded free electron laser at Pohang Accelerator Laboratory X-ray free electron laser
SCIE
SCOPUS
- Title
- Soft X-ray harmonic lasing self-seeded free electron laser at Pohang Accelerator Laboratory X-ray free electron laser
- Authors
- NAM, INHYUK; MIN, CHANG KI; KIM, CHANG BUM; YANG, HAERYONG; KIM, KYUJIN; HEO, HOON; KWON, SOONNAM; PARK, SANG HAN; KANG, HUNG SIK
- Date Issued
- 2018-05
- Publisher
- AMER INST PHYSICS
- Abstract
- The demonstration of a harmonic lasing self-seeded free-electron laser (HLSS FEL) scheme in the soft X-ray range at the Pohang Accelerator Laboratory X-ray Free Electron Laser is presented. We report the experimental results of HLSS FEL radiation with the shortest wavelength of 1nm by using the optimized phase shift of 2/3 pi. The key feature of the HLSS scheme is that the mode number is decreased (the longitudinal coherence length is enhanced) which is directly observed using a single-shot spectrometer. The spectral brightness is enhanced by a factor of 1.7 compared to the self-amplified spontaneous emission FEL because of the narrowed bandwidth. Our results show a good agreement with the theoretical expectation and simulations. The HLSS mode is a promising standard operation mode to generate a stable and high-brightness X-ray FEL that will provide more benefits to users for various applications. Published by AIP Publishing.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/94598
- DOI
- 10.1063/1.5030443
- ISSN
- 0003-6951
- Article Type
- Article
- Citation
- APPLIED PHYSICS LETTERS, vol. 112, no. 21, page. 213506-1 - 213506-3, 2018-05
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