A microstrip gas chamber (MSGC) with a semi-transparent CsI photon converter for the detection of single VUV photons is described. The detector is sensitive to photons in the wavelength region 160 nm < λ < 220 nm and is operated with Ar-C4H10, (90-10) as detector gas at p = 1000 mbar with a gain g ≃ 3 × 104. The back electrode of the MSGC is formed by a pad array allowing for two-dimensional position determination of the incident photon. For single VUV photons at λ ≃ 172 nm a detection efficiency εtol≃ 9% with anode readout and εtot≃ 3.5% with pad readout could be achieved.
Zeitelhack, K., Stolz, A., Bauer, B., Erbe, C., Friese, J., Gernhäuser, R., … Winkler, S. (1996). A two-dimensional position sensitive microstrip gas chamber for single VUV photons. Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 371(1–2), 57–60. https://doi.org/10.1016/0168-9002(95)01139-0