The PXS beam line operates with the L1.1 laser beam measuring 50 mm in diameter  (1/e2) and achieves maximum conversion efficiency of the available laser energy to femtosecond pulses of X-ray radiation in the spectral range of 4–30 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
  • A focal spot imaging system to monitor the focusing of the attenuated driving laser beam
  • An X-ray spectrometer, consisting of an X-ray photodiode, an amplifier, and a digital pulse processor unit for 1) shot-to-shot pulse energy measurement and 2) emission spectra measurement.

The X-ray output port has three output Beryllium windows: two for user end-stations and one for the X-ray emission monitor.

Petr Brůža

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Research / X-Ray Sources / Plasma X-Ray Sources (PXS)

In a PXS source laser, pulses are focused on a renewing solid-density target and produce plasma. Hard x-rays are then emitted from the plasma. These contain both continuum radiation and x-ray lines, and have a duration of 100s femtoseconds.