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Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating
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Quantum-dot-array diffraction grating with single order diffraction property for soft x-ray region.

Longyu Kuang1, Chuanke Wang, Zhebin Wang

  • 1Key Laboratory of Plasma Science and Technology, Research Center of Laser Fusion, China Academy of Engineering Physics, P.O. Box 919-986, Mianyang, Sichuan 621900, People's Republic of China.

The Review of Scientific Instruments
|August 7, 2010
PubMed
Summary
This summary is machine-generated.

A novel quantum-dot-array diffraction grating (QDADG) effectively disperses soft x-rays without higher-order diffractions. This new grating offers consistent diffraction efficiencies, crucial for accurate soft x-ray power spectrum analysis.

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Area of Science:

  • Optics and Photonics
  • X-ray Spectroscopy
  • Materials Science

Background:

  • Traditional gold transmission gratings are standard for soft x-ray spectral analysis at facilities like the Z facility.
  • Measuring the absolute soft x-ray power from z-pinch and hohlraum sources requires precise spectral dispersion.

Purpose of the Study:

  • To design and fabricate a novel quantum-dot-array diffraction grating (QDADG) for soft x-ray applications.
  • To evaluate the performance and calibration of the QDADG in the soft x-ray energy range.

Main Methods:

  • The QDADG was designed based on binary sinusoidal transmission grating principles with a density of 250 lines/mm.
  • Diffraction efficiencies were measured using photon energies between 150-300 eV at the Beijing Synchrotron Radiation Facility (Beamline 3W1B).
  • Calibration techniques and basic concepts of the QDADG were detailed.

Main Results:

  • The 250 lines/mm QDADG successfully dispersed soft x-rays without generating higher-order diffractions.
  • The grating exhibited nearly constant diffraction efficiencies of approximately 25% across the measured energy range.
  • Calibration results confirmed the grating's suitability for soft x-ray spectral analysis.

Conclusions:

  • The newly developed QDADG is a viable alternative to conventional gratings for soft x-ray spectral measurements.
  • Its consistent diffraction efficiency simplifies and improves the accuracy of soft x-ray power spectrum analysis.
  • This advancement benefits research involving z-pinch and hohlraum radiation sources.