Position-sensitive single-photon detection with a hybrid silicon pixel array tube

The hybrid Imaging Silicon Pixel Array (ISPA) tube combines the best aspects of image intensification with new possibilities offered by integrated electronics. The anode of the ISPA tube is a matrix of small silicon pixels directly detecting with a high spatial resolution electrons emitted by the photocathode. The pixels are individually bump-bonded to an integrated electronic read-out chip, allowing high gain, high speed and low noise. This paper presents a detailed study of the single-photon detection efficiency of the tube, and concludes with perspectives offered by the development of new electronics and tube designs.