The muon momentum can be precisely measured by the inner tracking detectors. Therefore the muon detector should only have many position measurements to obtain good matching with the tracks, where modest position resolution is required. Modest timing resolution is also required to reject cosmic ray backgrounds. As the requirements are much looser than those for the LHC experiments, we think that we can construct the muon detector with existing detector technologies. We may apply new technologies developed for LHC if required.
Fig. 10.1 is a cross sectional view of the standard detector, where the muon detector layout is shown. In the barrel region the solenoid magnet is surrounded by one layer of plastic scintillator counters, followed by six muon detector layers; one layer just inside the return yoke, four layers in the return yoke, and one layer just outside the return yoke. The endcap muon detectors have a similar detector configuration. The total area of the muon layers amounts to about 4,000 m2.