Several new ideas are adduced to the problem of designing muon shielding for a neutrino experimental facility operated at high energy, a problem of interest for the National Accelerator Laboratory (NAL) and CERN-II. We outline a practical calculational procedure which permits the evaluation of the effect of magnetized-iron-Iens geometries on the intensity distribution of muons at the detector location. Such relevant effects as range straggling and multiple scattering within and around the lens are included in the evaluation. A specific design is outlined which would increase the maximum energy of bubble chamber beams in the NAL neutrino area from 350 to about 500 GeV. however, to provide a basis for non-experts and for our own discussion.The basic elements of a neutrino facility are shown in Fig. 1. A primary proton beam is impinged on a target T to produce secondary particles, primarily nand K mesons. The mesons are allowed to decay in the two-body mode:The drift (decay) space is usually terminated by a beam stop followed by a massive radiation shield and the detector in series. The neutrinos, of course, being neutral and participating only in weak interactions easily penetrate the beam stop and shield and reach the detector attenuated only by geometry.If we refer to Fig. 1 we see that the drift space (decay tunnel) has length L and is followed by a beam stop of negligible length, a 'disc' of radius R (for purposes of later discussion), a massive muon shield and a detector area at a distance x downstream of the beam stop. The total space available for the facility is L+x. For a given available space we wish to maximize L (up to the point of 1'-12 mean lives for the parent mesons) and minimize x in order to maximize the neutrino flux at the detector always subject to the constraint that the charged particle flux at the detector be low enough for personnel safety and bubble chamber operation.
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