期刊
JOURNAL OF SYNCHROTRON RADIATION
卷 23, 期 -, 页码 43-49出版社
INT UNION CRYSTALLOGRAPHY
DOI: 10.1107/S1600577515020354
关键词
wavefront; Hartmann sensor; free-electron laser; soft X-rays
资金
- FLASH user facility through the BMBF program [FSP301-FLASH]
- 'IRUVX-PP', EU [211285]
- Deutsche Forschungsgemeinschaft [SFB755]
Different types of Hartmann wavefront sensors are presented which are usable for a variety of applications in the soft X-ray spectral region at FLASH, the free-electron laser (FEL) in Hamburg. As a typical application, online measurements of photon beam parameters during mirror alignment are reported on. A compact Hartmann sensor, operating in the wavelength range from 4 to 38 nm, was used to determine the wavefront quality as well as aberrations of individual FEL pulses during the alignment procedure. Beam characterization and alignment of the focusing optics of the FLASH beamline BL3 were performed with lambda(13.5) (nm)/116 accuracy for wavefront r.m.s. (w(rms)) repeatability, resulting in a reduction of w(rms) by 33% during alignment.
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