Open AccessPulse intensity characterization of the LCLS nanosecond double‐bunch mode of operation
Author(s) -
Sun Yanwen,
Decker Franz-Josef,
Turner James,
Song Sanghoon,
Robert Aymeric,
Zhu Diling
Publication year - 2018
Publication title -
journal of synchrotron radiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.172
H-Index - 99
ISSN - 1600-5775
DOI - 10.1107/s160057751800348x
Subject(s) - nanosecond , ultrashort pulse , pulse (music) , characterization (materials science) , optics , intensity (physics) , physics , materials science , computer science , laser , detector
The recent demonstration of the `nanosecond double‐bunch' operation mode, i.e. two X‐ray pulses separated in time between 0.35 and hundreds of nanoseconds and by increments of 0.35 ns, offers new opportunities to investigate ultrafast dynamics in diverse systems of interest. However, in order to reach its full potential, this mode of operation requires the precise characterization of the intensity of each X‐ray pulse within each pulse pair for any time separation. Here, a transmissive single‐shot diagnostic that achieves this goal for time separations larger than 0.7 ns with a precision better than 5% is presented. It also provides real‐time monitoring feedback to help tune the accelerator parameters to deliver double pulse intensity distributions optimized for specific experimental goals.