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Mutations01:35

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Radiation damage in charge-coupled devices.

Niels Bassler1

  • 1Department of Physics and Astronomy, University of Aarhus, 8000 Arhus C, Denmark. bassler@phys.au.dk

Radiation and Environmental Biophysics
|March 19, 2010
PubMed
Summary
This summary is machine-generated.

Charge-coupled devices (CCDs) are vital space detectors but vulnerable to radiation. This study quantizes radiation effects on CCDs and explores mitigation strategies like cooling and annealing, crucial for space missions.

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Area of Science:

  • Astrophysics and Space Science
  • Detector Physics
  • Radiation Effects

Background:

  • Charge-coupled devices (CCDs) are primary optical photon detectors in astronomy due to high sensitivity and signal-to-noise ratio.
  • CCDs are integral to space missions like Hubble and Cassini, and in satellite star trackers.
  • A significant limitation of CCDs is their vulnerability to space radiation.

Purpose of the Study:

  • To provide an overview of radiation effects on CCDs.
  • To discuss mitigation strategies beyond shielding, including cooling and annealing.
  • To investigate the radiation hardness of the Marconi Applied Technologies CCD47-20.

Main Methods:

  • Exposure of two engineering-grade CCD47-20 devices to proton beams and photons.
  • Simulation of radiation fields encountered in highly elliptic orbits crossing Van-Allen belts.
  • Quantification of observed radiation-induced effects.

Main Results:

  • Observed increases in bulk dark current.
  • Observed increases in surface dark current.
  • Observed shifts in inversion threshold voltage.

Conclusions:

  • Radiation significantly impacts CCD performance, affecting dark current and voltage thresholds.
  • Mitigation techniques like cooling and annealing are essential for maintaining CCD functionality in space.
  • The CCD47-20 exhibits specific vulnerabilities that require consideration for space applications.