A new position sensing x-ray detector: Working principle and experimental results

Journal Article · Mon Feb 01 04:00:00 EST 1999 · IEEE Transactions on Electron Devices

DOI:https://doi.org/10.1109/16.740898· OSTI ID:320976

Castoldi, A; Guazzoni, C ^[1]

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1. Politecnico di Milano (Italy)

The working principle and the first experimental characterization of a new fully depleted X-ray detector, called controlled-drift detector (CDD), are presented. The detector is operated in integrate-readout mode. During the integration phase the signal electrons generated by the incident X-ray are stored in suitably engineered potential wells. During the readout phase the potential wells are removed and replaced by a uniform drift field that transports the signal electrons to the readout electrode. The drift time gives the position of incidence. Full depletion of the detector wafer allows for high X-ray efficiency and for backward illumination. The first experimental measurements demonstrate the fast readout of the integrated signal electrons achievable with a static drift field. At a drift field of 300 V/cm the measured readout speed is 0.35 cm/{micro}s. The expected charge handling capacity is 10{sup 5}--10{sup 6} electrons per pixel. The new detector provides unambiguous two-dimensional (2-D) position measurement with readout times of the order of 10 {micro}s.

• OSTI ID: 320976
• Journal Information: IEEE Transactions on Electron Devices, Journal Name: IEEE Transactions on Electron Devices Journal Issue: 2 Vol. 46; ISSN IETDAI; ISSN 0018-9383
• Country of Publication: United States
• Language: English

Related Subjects

44 INSTRUMENTATION
INCLUDING NUCLEAR AND PARTICLE DETECTORS
DESIGN
POSITION SENSITIVE DETECTORS
READOUT SYSTEMS
SEMICONDUCTOR DETECTORS
X-RAY DETECTION