Statistical analysis of hard X‐ray radiation at the PAL‐XFEL facility performed by Hanbury Brown and Twiss interferometry. (7th October 2022)

• Record Type: Journal Article
• Authors: Kim, Young Yong; Khubbutdinov, Ruslan; Carnis, Jerome; Kim, Sangsoo; Nam, Daewoong; Nam, Inhyuk; Kim, Gyujin; Shim, Chi Hyun; Yang, Haeryong; Cho, Myunghoon; Min, Chang-Ki; Kim, Changbum; Kang, Heung-Sik; Vartanyants, Ivan A.
• Is Part Of: Journal of synchrotron radiation. Volume 29:Part 6(2022)
• Page Start: 1465
• Page End: 1479
• Publication Date: 2022-10-07
• Subjects: Hanbury Brown and Twiss interferometry -- second‐order correlation functions -- X‐ray free‐electron lasers -- statistical properties; Synchrotron radiation -- Periodicals; Free electron lasers -- Periodicals; 539.73505
• DOI: 10.1107/S1600577522008773
• Languages: English
• ISSNs: 0909-0495

Abstract

Abstract : Statistical properties of the hard X‐ray free‐electron laser PAL‐XFEL were studied by Hanbury Brown and Twiss interferometry. The results demonstrate high spatial coherence and short average pulse duration of this facility at 10 keV photon energy. Abstract : A Hanbury Brown and Twiss interferometry experiment based on second‐order correlations was performed at the PAL‐XFEL facility. The statistical properties of the X‐ray radiation were studied within this experiment. Measurements were performed at the NCI beamline at 10 keV photon energy under various operation conditions: self‐amplified spontaneous emission (SASE), SASE with a monochromator, and self‐seeding regimes at 120 pC, 180 pC and 200 pC electron bunch charge. Statistical analysis showed short average pulse duration from 6 fs to 9 fs depending on the operational conditions. A high spatial degree of coherence of about 70–80% was determined in the spatial domain for the SASE beams with the monochromator and self‐seeding regime of operation. The obtained values describe the statistical properties of the beams generated at the PAL‐XFEL facility.