High-Speed, Photon Counting CCD Cameras for Astronomy
Craig Mackay, Tim D. Staley, David King, Frank Suess, Keith Weller

TL;DR
This paper discusses the design and optimization of high-speed electron multiplying CCD cameras for astronomy, demonstrating improved performance and reduced noise levels through careful design and operation at high speeds.
Contribution
It introduces design strategies for high-speed photon counting CCDs that significantly enhance performance and reduce noise in astronomical applications.
Findings
Cameras operate effectively at 26 MHz with high gain.
Clock induced charge levels can be substantially reduced.
Astronomical observations demonstrate practical utility.
Abstract
The design of electron multiplying CCD cameras require a very different approach from that appropriate for slow scan CCD operation. This paper describes the main problems in using electron multiplying CCDs for high-speed, photon counting applications in astronomy and how these may be substantially overcome. With careful design it is possible to operate the E2V Technologies L3CCDs at rates well in excess of that claimed by the manufacturer, and that levels of clock induced charge dramatically lower than those experienced with commercial cameras that need to operate at unity gain. Measurements of the performance of the E2V Technologies CCD201 operating at 26 MHz will be presented together with a guide to the effective reduction of clock induced charge levels. Examples of astronomical results obtained with our cameras are presented.
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