Solid-State Charpak Detector with Unipolar Time-Differential Pulse Response

Details Solid-State Charpak Detector with Unipolar Time-Differential Pulse Response Solid-State Charpak Detector with Unipolar Time-Differential Pulse Response

2012-04-22

arxiv.org/abs/1204.4849v1

Physics

Instrumentation and Detectors

6 pages, 4 figures

Scientific paper

We demonstrate, for the first time, a high granularity multi-well solid-state detector (MWSD) with the unipolar time-differential property for ultrafast pulse response. Results show a speed improvement factor of up to ~400 for amorphous selenium MWSD. The significance of the results presented here is the ability to reach the intrinsic physical limit for detector pulse speed by transitioning from the slow transit-time-limited response which depends on the bulk carrier transport mechanism, to the ultrafast dispersion-limited response which depends on the spatial spreading of the collected carrier packet. Furthermore, the proposed structure is the practical approach for achieving stable avalanche multiplication gain in large-area direct radiation detectors.

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