Spectroscopic-grade X-ray imaging up to 100-kHz frame rate with controlled-drift detectors | IEEE Journals & Magazine | IEEE Xplore

Spectroscopic-grade X-ray imaging up to 100-kHz frame rate with controlled-drift detectors


Abstract:

Controlled-drift detectors are fully depleted silicon detectors for X-ray imaging that combine good position resolution with very fast frame readout. The basic feature of...Show More

Abstract:

Controlled-drift detectors are fully depleted silicon detectors for X-ray imaging that combine good position resolution with very fast frame readout. The basic feature of the controlled-drift detector is the transport of the charge packets stored in each pixel column to the output electrode by means of a uniform drift field. The drift time of the charge packet identifies the pixel of incidence. Images of an X-ray source obtained with the controlled-drift detector up to 100-kHz frame rate are presented and discussed. The achievable energy resolution as a function of the operating temperature and frame rate is analyzed.
Published in: IEEE Transactions on Nuclear Science ( Volume: 48, Issue: 4, August 2001)
Page(s): 982 - 986
Date of Publication: 31 August 2001

ISSN Information:


I. Introduction

THE controlled-drift detector (CDD) was proposed in 1997 [1], and the first experimental evidence of its working principle was reported in [2]. The device is built on a fully depleted 300- m-thick high-resistivity wafer and is operated in integrate-readout mode. The basic idea of the CDD is to generate columns of equally spaced potential wells for the electrons by superposing a periodic perturbation of sufficient amplitude to a linear drift potential. During the integration mode, the signal electrons are stored within these wells. The removal of these potential barriers in an externally controlled way allows the use of the linear drift potential to sweep the electrons toward the readout electrodes. The time between the removal of the barriers and the arrival of the signal electrons at the readout electrodes gives the position of the irradiated pixel along the drift direction. The second coordinate is obtained by providing a separate readout electrode for each pixel column. Arrays of deep -implants provide lateral confinement. In Fig. 1, the layout of the anode region of the controlled-drift detector is shown.

References

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