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

页码：39 / 43

页数：5