研究目的
To produce hard x-ray free-electron laser (FEL) radiation with unprecedented large bandwidth tunable up to 2% and demonstrate its continuous tunability with a simple method only requiring a quadrupole magnet.
研究成果
The generation of x-ray FEL radiation with tunable bandwidth as large as 2% has been demonstrated. The broadband pulses produced at SwissFEL pave the way for outstanding progress in x-ray science by significantly improving the efficiency of numerous experimental techniques.
研究不足
The spectral brightness or brilliance is reduced in proportion to the bandwidth increase. The method to generate broadband pulses employed here could also be used at other facilities, but SwissFEL has two advantages over most other existing x-ray FEL facilities.
1：Experimental Design and Method Selection:
The bandwidth is enhanced by maximizing the energy chirp of the electron beam, accomplished by optimizing the compression setup.
2：Sample Selection and Data Sources:
Experiments carried out at SwissFEL, the x-ray FEL facility at the Paul Scherrer Institute in Switzerland.
3：List of Experimental Equipment and Materials:
SwissFEL facility, quadrupole magnet, spectrometer, monochromator, photodiode.
4：Experimental Procedures and Operational Workflow:
The electron beam is longitudinally compressed in two bunch compressors (BC1 and BC2). An x-band cavity is used to linearize the compression. SwissFEL has two transverse-deflecting structures (TDS) to diagnose the longitudinal properties of the beam.
5：2). An x-band cavity is used to linearize the compression. SwissFEL has two transverse-deflecting structures (TDS) to diagnose the longitudinal properties of the beam. Data Analysis Methods:
5. Data Analysis Methods: The FEL spectra at SwissFEL are measured shot-to-shot using a spectrometer with a relative resolution between 2 × 10?5 and 5 × 10?5 and a field of view corresponding to about 0.5% of the radiation wavelength.
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