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An Experimental Protocol for Femtosecond NIR/UV - XUV Pump-Probe Experiments with Free-Electron Lasers
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Focusing x-ray spectrograph for laser fusion experiments.

B Yaakobi1, R E Turner, H W Schnopper

  • 1Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623Center for Astrophysics, Cambridge, Massachusetts 02138.

The Review of Scientific Instruments
|December 1, 1979
PubMed
Summary

A new focusing spectrograph significantly enhances X-ray spectral measurements from laser fusion. This curved crystal device offers 100x higher sensitivity for laser-plasma diagnostics compared to traditional flat crystal spectrographs.

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Area of Science:

  • Plasma Physics
  • Spectroscopy
  • Laser Fusion Diagnostics

Background:

  • Traditional X-ray spectra from laser fusion targets utilize flat crystal (non-focusing) spectrographs.
  • These methods present limitations in sensitivity and spectral band coverage for detailed analysis.

Purpose of the Study:

  • To introduce and characterize a novel focusing spectrograph for enhanced X-ray spectral measurements.
  • To demonstrate the improved sensitivity and performance of a curved crystal spectrograph over flat crystal designs.

Main Methods:

  • Development and testing of a focusing spectrograph utilizing a curved mica crystal.
  • Measurement of X-ray spectra in the 10-11 Angstrom range from laser-imploded glass microballoons.
  • Comparison of spectral intensity per unit area on film with curved versus flat mica spectrographs.

Main Results:

  • The focusing spectrograph achieved significantly higher sensitivity in recording wide-band X-ray spectra.
  • Intensity per unit area on film was approximately 100 times higher using a curved mica spectrograph compared to a flat mica spectrograph.
  • The Nd:Glass laser system and microballoon targets provided a suitable source for evaluating spectrograph performance.

Conclusions:

  • A focusing spectrograph offers a substantial improvement in sensitivity for X-ray spectral measurements in laser fusion.
  • The curved crystal design is highly effective for wide-band spectral recording, enabling more detailed plasma diagnostics.
  • This advancement facilitates more precise characterization of laser-produced plasmas and fusion processes.