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Preprint 15/99


Development and characterisation of a visible light photon counting imaging detector system

J. Barnstedt (1), M. Grewing (1;2)

(1) Institut für Astronomie und Astrophysik, Astronomie, Universität Tübingen, Waldhäuser Str. 64, D-72076 Tübingen, Germany
(2) Institut de Radio Astronomie Millimétrique (IRAM), 300 Rue de la Piscine, F-38406 Saint Martin d'Hères, France

2002, Proc. of the 5th International Conference on Position Sensitive Detectors, Nuclear Instruments And Methods In Physics Research Sect. A 477, 268 - 272

Abstract. We report on the development of a visible light photon counting imaging detector system. The detector concept is based on standard 25 mm diameter micro channel plate image intensifiers made by Proxitronic in Bensheim (Germany). Modifications applied to these image intensifiers are the use of three micro channel plates instead of two and a high resistance ceramics plate used instead of the standard phosphor output screen. A wedge and strip anode mounted directly behind the high resistance ceramics plate was used as a read out device. This wedge and strip anode picks up the image charge of electron clouds emerging from the micro channel plates. The charge pulses are fed into four charge amplifiers and subsequently into a digital position decoding electronics, achieving a position resolution of up to 1024 x 1024 pixels. Mounting the anode outside of the detector tube is a new approach and has the great advantage to avoid electrical feedthroughs from the anode so that the standard image intensifier fabrication process can be applied to produce these photon counting detector tubes. First results of the characterisation of gain, homogeneity, dark current and imaging linearity are presented.

Key words: Micro channel plate; photon counting imaging detector; wedge and strip anode

Paper (318k gzip'ed Postscript including figures), Poster (764k gzip'ed Postscript including figures)


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