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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.
