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Characterizing electron-collecting CdTe for use in a 77 ns burst-rate imager.

Lena A Franklin1, Nicholas J Brown1, Sol M Gruner1

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The Keck-PAD detector was upgraded for faster imaging at the Advanced Photon Source. New electron-collecting cadmium telluride sensors achieve rapid charge collection, meeting new speed requirements.

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Area of Science:

  • X-ray detector technology
  • Materials science for high-energy physics

Background:

  • The Keck-PAD (pixel array detector) was designed for high-speed X-ray imaging at the Advanced Photon Source (APS).
  • Upcoming APS upgrades will reduce the time between electron bunches to 77 ns, necessitating faster detector electronics and sensor materials.

Purpose of the Study:

  • To modify the Keck-PAD electronics and evaluate new sensor materials for high-energy X-ray imaging at the reduced 77 ns bunch period.
  • To ensure >90% charge collection within 35 ns for 40 keV X-rays using electron-collecting CdTe.

Main Methods:

  • Bonding of 750 µm-thick electron-collecting Schottky cadmium telluride (CdTe) to Keck-PAD and CU-APS-PAD application-specific integrated circuits (ASICs).
  • Investigating carrier mobility through detector response to single X-ray bunches at the Cornell High Energy Synchrotron Source and pulsed optical laser.
  • Simulating charge collection times for electron-collecting CdTe at 40 keV.

Main Results:

  • Electron-collecting CdTe demonstrated >90% charge collection within 35 ns in simulations, meeting the 77 ns imaging requirement.
  • Experimental tests confirmed that the carrier mobility of the electron-collecting CdTe meets the necessary collection time for high-speed imaging.
  • Successful bonding of CdTe to Cornell-developed ASICs was achieved.

Conclusions:

  • The developed electron-collecting CdTe sensors are suitable for high-speed X-ray imaging at the upgraded APS.
  • The Keck-PAD detector system, with modifications and new sensors, can achieve the required 77 ns imaging frame rate.
  • This advancement enables more efficient data acquisition in high-energy X-ray experiments.