Design of a Variable Length Muon Shield in Area 1
Aug 1, 1970Citations per year
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Abstract:
It is argued that the circumstances of normal operation will exert heavy pressures to operate the neutrino beam in Area 1 at 200 GeV most of the time and that consequently it is very important to try to achieve maximum operating intensity for 200-GeV operation, without sacrificing the 500-GeV capabilities of the area. To accomplish this, a tunnel running about half the length of the 1000-meter dirt shield is proposed which is left open as an extension of the decay region for 200-GeV operation. It is terminated with a hadron dump for the 200-GeV muon beam. For use at 500-GeV, the tunnel is plugged by one of several methods and hadron dump at the front end restores the full 1000-meter shield. The tunnel can be either a pipe into which perchloroethylene is pumped to fill it and from which it can be emptied into a separate reservoir, or else a subway passage that can be plugged by "railway cars" carrying concrete plugs, or with stations into which iron plugs may be moved laterally. More detailed analysis is required to decide among these methods, all of which appear to satisfy the prime requirements. An overall increase in intensity of neutrinos by a factor averaging about 2 is obtained in this way for 200-GeV operation.References(2)
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