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A new clocking method for a charge coupled device.

Rika Umezu1, Shunji Kitamoto1, Hiroshi Murakami2

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We introduce a new panning mode clocking method for charge-coupled devices (CCDs) to improve X-ray photon counting rates. This method mitigates pile-up, enhancing astronomical observations of bright objects.

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Area of Science:

  • Astrophysics
  • Detector Physics
  • Instrumentation

Background:

  • Charge-coupled devices (CCDs) are used as X-ray photon detectors.
  • High counting rates in CCDs lead to photon pile-up, limiting detector performance.
  • Photon pile-up is particularly problematic for astronomical observations of bright point sources.

Purpose of the Study:

  • To propose and demonstrate a novel clocking method for CCDs to address photon pile-up.
  • To compare the pile-up tolerance and characteristics of the new method against existing modes.
  • To improve the counting rate capabilities of CCDs for X-ray detection.

Main Methods:

  • Development of a new CCD clocking method termed 'panning mode'.
  • Implementation of a simulation to investigate pile-up probability.
  • Experimental validation comparing simulated and actual event rates.
  • Comparative analysis of pile-up tolerance across different clocking modes.

Main Results:

  • The panning mode offers complementary properties to normal and parallel sum (P-sum) modes.
  • Simulations and experimental results demonstrated the effectiveness of the panning mode in reducing pile-up.
  • The study compared pile-up tolerance and other characteristics of various clocking methods.

Conclusions:

  • The proposed panning mode enhances the counting rate of CCDs by mitigating photon pile-up.
  • This new method offers improved performance for X-ray detection, especially in astronomical applications.
  • Panning mode provides a valuable alternative for optimizing CCD performance in high-count-rate scenarios.