Soft X-ray spectroscopy of clusters, surfaces and interfaces

Spectrometer for shot-to-shot wavelength spectroscopy at high repetition FELs

In cooperation with the Paul Scherrer Institut (PSI) and DESY we have developed a compact spectrometer for shot-to-shot wavelength characterization for FLASH [1]. This grating based spectrometer can be placed behind transparent experiments and uses the GOTTHARD [2] detector, a single line detector with readout frequencies of up to 1 MHz. The spectrometer can monitor online and record the wavelength distribution of the pulses over the pulse train for machine studies, tuning and correlation with up front mounted spectroscopic experiments.

Schematic setup: The spectrometer features two gratings, which are selectable under vacuum conditions and cover the whole wavelength region of the FLASH fundamental. Compared to alternative spectrometers based on the ionization of gases targets, grating spectrometers are free of space charge and non-linear effects. The dispersed FEL beam hits a Ce:YAG crystal and generates a fluorescence of visible light. The fluorescence is imaged and magnified via an out of vacuum lens system onto the detection area of the detector. [2] Reproduced from S. Palutke et. al., Rev. Sci. Instrum. 86, 113107 (2015), with the permission of AIP Publishing.

 

[1] S. Palutke et. al., Rev. Sci. Instrum. 86, 113107 (2015)
[2] A. Mozzanica et. al. 2012 JINST 7 C01019

 

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