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- Title
THz pulse doubler at FLASH: double pulses for pump--probe experiments at X-ray FELs.
- Authors
Zapolnova, Ekaterina; Golz, Torsten; Pan, Rui; Klose, Karsten; Schreiber, Siegfried; Stojanovic, Nikola
- Abstract
FLASH, the X-ray free-electron laser in Hamburg, Germany, employs a narrowband high-field accelerator THz source for unique THz pump X-ray probe experiments. However, the large difference in optical paths of the THz and X-ray beamlines prevents utilization of the machine's full potential (e.g. extreme pulse energies in the soft X-ray range). To solve this issue, lasing of double electron bunches, separated by 28 periods of the driving radiofrequency (at 1.3 GHz), timed for the temporal overlap of THz and X-ray pulses at the experimental station has been employed. In order to optimize conditions for a typical THz pump X-ray probe experiment, X-ray lasing of the first bunch to one-sixth of that of the second has been suppressed. Finally, synchronization of THz radiation pulses was measured to be ~20 fs (r.m.s.), and a solution for monitoring the arrival time for achieving higher temporal resolution is presented.
- Subjects
FREE electron lasers; ELECTRON accelerators; X-ray lasers; SYNCHROTRON radiation; SYNCHROTRON radiation sources; RADIO frequency
- Publication
Journal of Synchrotron Radiation, 2018, Vol 25, Issue 1, p1
- ISSN
0909-0495
- Publication type
Article
- DOI
10.1107/S1600577517015442