THz pulse doubler at FLASH: double pulses for pump-probe experiments at X-ray FELs

被引：14
|
作者：
Zapolnova, Ekaterina [1 ]
Golz, Torsten [1 ]
Pan, Rui [1 ]
Klose, Karsten [1 ]
Schreiber, Siegfried [1 ]
Stojanovic, Nikola [1 ]
机构：
[1] Deutsch Elektronen Synchrotron DESY, Notkestr 85, D-22607 Hamburg, Germany
来源：
JOURNAL OF SYNCHROTRON RADIATION | 2018年 / 25卷
关键词：
FLASH; free-electron laser; THz beamline; pump-probe experiments; double electron bunches; X-rays; FREE-ELECTRON-LASER; BEAMLINE;
D O I：
10.1107/S1600577517015442
中图分类号：
TH7 [仪器、仪表];
学科分类号：
0804 ; 080401 ; 081102 ;
摘要：
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 similar to 20 fs (r.m.s.), and a solution for monitoring the arrival time for achieving higher temporal resolution is presented.
引用
收藏
页码：39 / 43
页数：5
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