The EXOSAT Imaging X-Ray Detectors

The European X-ray Observatory Satellite (EXOSAT) was launched in May 1983. Its payload includes two X-ray telescopes, whose images are registered by either an imaging proportional counter (PSD) or a channel multiplier array detector (CMA). We describe the design, construction and pre-flight performance of these detectors. We also present preliminary in-orbit performance data. Finally, we summarise our recent work on improving these detectors for possible use in future payloads such as the Advanced X-ray Astrophysics Facility (AXAF).