Plasma X-Ray Source (PXS)

The PXS source is based on the interaction of focused ultrashort laser pulses and liquid metal targets. The resulting plasma emits ultrashort, high brightness X-ray pulses with durations of a few hundreds of femtoseconds.

The PXS beam line: 

operates with the in-house developed L1 Allegra. X-ray radiation is in the spectral range of 3–77 keV. Using an off-axis parabola, the laser beam is focused onto the continuously restoring solid-density target, enabling long-term 1 kHz operation of the beam line. The beam delivery chamber and the plasma interaction chamber are separated by an anti-reflection (AR)-coated quartz window to suppress contamination of the beam transport system by debris. Several diagnostics will be implemented in order to monitor the driving laser beam and the output X-ray radiation:

  • An imaging system to monitor the position and spatial profile of the visible emission from the plasma plume (integral part of PXS)
  • A focal spot imaging system to monitor the focusing of the attenuated driving laser beam (integral part of PXS)
  • An X-ray spectrometer, consisting of an X-ray photodiode, an amplifier, and a digital pulse processor emission spectra measurement (integral part of PXS)
  • On-shot spectrometer and ultra-fast photodiode to analyze the shot-to-shot stability and determine the flux as an online monitoring system (additional monitoring system)

The X-ray output port has three output Beryllium windows: two for user end stations and one for the X-ray emission monitor. Following end stations are deployed at the PXS beam line:

  1. Goniometer-based diffractometer including a Cu-Ka X-ray tube to provide CW X-ray pump beam and additional X-ray analysis
  2. Von Hamos X-ray absorption/emission spectrometer

Both end stations are complemented by single-photon counting (Dectris EIGER X 1M) and charge integrating (Princeton MTE 2048B, Andor iKON B-DD) X-ray detectors as well as scintillator-based photodiode arrays (Hamamatsu S-11866-128G-2).

Contact: Đông Du Mai, du.mai@eli-beams.eu

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