Abstract
A new modification of a table-top laser-driven water-jet plasma X-ray source has been successfully implemented and commissioned at the Extreme Light Infrastructure (ELI) Beamlines user facility. In order to preserve the broadband nature of the source for spectroscopic experiments, a polycapillary lens was initially chosen as the focusing element. Generally, polycapillary X-ray optics have a narrow photon acceptance angle and small field of view, making alignment complicated and time-consuming. This contribution demonstrates a straightforward, reliable and reproducible procedure for aligning polycapillary focusing optics with broadband X-rays. The method involves a pre-alignment step where two X-ray slits are mounted orthogonally on opposite sides of a 3D-printed cylindrical polycapillary holder. This helps to precisely determine the optical axis of the X-ray beam. Subsequent mounting of the polycapillary in the pre-aligned holder with the slits removed allowed for immediate transmission of the X-ray photons through the optics and has provided a good starting point forfine alignment.
Highlights
The advent of compact table-top laser-driven pulsed X-ray sources (Korn et al, 2002; Zamponi et al, 2009; Uhlig et al, 2013) has enabled significant progress in time-resolved studies (Rischel et al, 1997; Rousse et al, 2001; Hauf et al, 2019; Lu et al, 2020) using mid- to high-power laser systems (e.g. Batysta et al, 2016)
We demonstrate a reliable approach to achieve time-efficient and precise alignment
Reliable and repeatable strategy of polycapillary alignment using two perpendicular masks imaged by a CCD camera to efficiently focus X-rays generated by a 4 polychromatic water-jet plasma X-ray source (PXS)
Summary
The advent of compact table-top laser-driven pulsed X-ray sources (Korn et al, 2002; Zamponi et al, 2009; Uhlig et al, 2013) has enabled significant progress in time-resolved studies (Rischel et al, 1997; Rousse et al, 2001; Hauf et al, 2019; Lu et al, 2020) using mid- to high-power laser systems (e.g. Batysta et al, 2016). It is already challenging to achieve some transmission of X-rays through the optics, and the polycapillary must be positioned carefully with respect to a spot-like X-ray source (Dabagov, 2003), often blindly with a precision of several tens of micrometres in three dimensions and a few degrees in two angles. In this communication, we demonstrate a reliable approach to achieve time-efficient and precise alignment
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