| Autor: |
Diez, Michael, Galler, Andreas, Schulz, Sebastian, Boemer, Christina, Coffee, Ryan N., Hartmann, Nick, Heider, Rupert, Wagner, Martin S., Helml, Wolfram, Katayama, Tetsuo, Sato, Tokushi, Sato, Takahiro, Yabashi, Makina, Bressler, Christian |
| Rok vydání: |
2020 |
| Předmět: |
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| Zdroj: |
Sci Rep 11, 3562 (2021) |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1038/s41598-021-82597-3 |
| Popis: |
We present a novel, highly versatile, and self-referenced arrival time monitor for measuring the femtosecond time delay between a hard X-ray pulse from a free-electron laser and an optical laser pulse, measured directly on the same sample used for pump-probe experiments. Two chirped and picosecond long optical supercontinuum pulses traverse the sample with a mutually fixed time delay of 970 fs, while a femtosecond X-ray pulse arrives at an instant in between both pulses. Behind the sample the supercontinuum pulses are temporally overlapped to yield near-perfect destructive interference in the absence of the X-ray pulse. Stimulation of the sample with an X-ray pulse delivers non-zero contributions at certain optical wavelengths, which serve as a measure of the relative arrival time of the X-ray pulse with an accuracy of better than 25 fs. We find an excellent agreement of our monitor with the existing timing diagnostics at the SACLA XFEL with a Pearson correlation value of 0.98. We demonstrate a high sensitivity to measure X-ray pulses with pulse energies as low as 30 $\mu$J. Using a free-flowing liquid jet as interaction sample ensures the full replacement of the sample volume for each X-ray/optical event, thus enabling its utility even at MHz repetition rate XFEL sources. |
| Databáze: |
arXiv |
| Externí odkaz: |
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