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The X-ray telescope (XRT) on ROSAT consists of the following subsystems: X-ray Mirror Assembly (XMA), Position Sensitive Proportional Counter (PSPC) and High Resolution Imager (HRI). The following sections describe the performance of the individual subsystems; information on the performance of the overall system in its XMA+PSPC and XMA+HRI configuration can be found in Chapters 10 and 11 .
A schematic view of the XRT and its various subsystems is shown in Figure 4.1 . The magnetic deflector serves to significantly reduce any flux of soft electrons in the focal plane. A so-called South Atlantic Anomaly Detector (SAAD; not shown in Figure 4.1 ) is used to monitor the local charged particle environment in orbit.