Instrumented Flux Return

A variety of tradeoffs govern the design of the solenoidal coil and steel flux return of the detector. The optimization of the magnetic field value (1 or 1.5 Tesla), the choice of normal or superconducting technology for the coil and the instrumentation of the flux return to extend the physics capability of the detector are all involved. We will discuss the technical choices inv olved in arriving at an actual design these involve cost as well as physics performance. 

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For 7r/e and 7r//z separation as well as K/p separation in the 1-1.4 GeV/c region and above 2.7 GeV/c, one needs additional information lower-momentum electrons are identified by dE/dx, while higher-momentum electrons can be identified by pattern recognition in the electromagnetic calorimeter the instrumented flux return is employed for muon identification antiprotons leave a clear signature in the electromagnetic calorimeter. 

An instrumented flux return can serve as a calorimeter for detection and to extend effective tt/// separation to lower than usual momenta. In this regard, the larger thickness of a normal coil in interaction lengths becomes a consideration. 

The motivation for thoroughly instrumenting the magnet flux return is twofold ... 

The flux return design consists of 20-24 plates of 1 steel with 1 instrumented gaps. The detectors are larocci tubes with strip readout operated in limited streamer mode. Individual layers are read out, to ascertain the range of the candidate particle. 

Because the steel of the flux return and the instrumentation is highly segmented, the flux return adds two important capabilities to the detector. First, it extends muon detection to momenta below 1 GeV/c, by exploiting the small difference in range between /i s and tt s [1]. This is of value in improving efficiency both for reconstructing semi-leptonic B decays and for lepton tagging in CP violation experiments. Second, the flux return can... 

This simulation can be achieved in terms of a source—sink relationship. Rather than use the gas concentration around the test object as a target parameter, the test object can be surrounded by a sink of ca 2-7T solid angle. The solar panel is then maintained at its maximum operating temperature and irradiated by appropriate fluxes, such as those of photons. Molecules leaving the solar panel strike the sink and are not likely to come back to the panel. If some molecules return to the panel, proper instrumentation can determine this return as well as their departure rates from the panel as a function of location. The system may be considered in terms of sets of probabilities associated with rates of change on surfaces and in bulk materials. 

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