A beam branching method for timing and spectral characterization of hard X-ray free-electron lasers | Zendy

Tetsuo Katayama | Zendy; Shigeki Owada | Zendy; Tadashi Togashi | Zendy; K. Ogawa | Zendy; Petri Karvinen | Zendy; Ismo Vartiainen | Zendy; Anni Eronen | Zendy; Christian Dávid | Zendy; Takahiro Sato | Zendy; Kyo Nakajima | Zendy; Yasumasa Joti | Zendy; Hirokatsu Yumoto | Zendy; Haruhiko Ohashi | Zendy; Makina Yabashi | Zendy

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A beam branching method for timing and spectral characterization of hard X-ray free-electron lasers

Author(s) -

Tetsuo Katayama,

Shigeki Owada,

Tadashi Togashi,

K. Ogawa,

Petri Karvinen,

Ismo Vartiainen,

Anni Eronen,

Christian Dávid,

Takahiro Sato,

Kyo Nakajima,

Yasumasa Joti,

Hirokatsu Yumoto,

Haruhiko Ohashi,

Makina Yabashi

Publication year - 2016

Publication title -

structural dynamics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.415

H-Index - 29

ISSN - 2329-7778

DOI - 10.1063/1.4939655

Subject(s) - optics , laser , physics , beam (structure) , cathode ray , free electron laser , diffraction , photon , grating , electron , nuclear physics

We report a method for achieving advanced photon diagnostics of x-ray free-electron lasers (XFELs) under a quasi-noninvasive condition by using a beam-splitting scheme. Here, we used a transmission grating to generate multiple branches of x-ray beams. One of the two primary diffracted branches (+1st-order) is utilized for spectral measurement in a dispersive scheme, while the other (−1st-order) is dedicated for arrival timing diagnostics between the XFEL and the optical laser pulses. The transmitted x-ray beam (0th-order) is guided to an experimental station. To confirm the validity of this timing-monitoring scheme, we measured the correlation between the arrival timings of the −1st and 0th branches. The observed error was as small as 7.0 fs in root-mean-square. Our result showed the applicability of the beam branching scheme to advanced photon diagnostics, which will further enhance experimental capabilities of XFEL

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