Multiparticle Spectrometer Magnet (MPS)

During the last few years more and more Spectrometer Magnets were employed in high energy physics experiments. Most of these experiments detected a relatively small number of particle secondaries because the apertures of the magnets were not satisfactorily large. For this reason an attempt is being made at BNL to build a spectrometer which could accommodate experiments on more complicated types of interactions with detection of many secondaries. Obviously this spectrometer, in order to perform properly, will be large and with an acceptable magnetic field; it must have better resolution, and a wide solid angle acceptance. The basic idea is a large aperture C-magnet. High resolution digitized spark chambers, low mass proportional chambers and scintillation counter hodoscopes will be located and operated within the magnetic field volume which will be 4-ft high by 6-ft wide by 15-ft long. The main spectrometer is to be followed by a set of large digitized spark chambers, scintillation counter hodoscopes, and Cerenkov counter hodoscopes to provide improved momentum resolution and particle identification for those particles which emerge through the downstream aperture of the magnets. This magnet spark chamber combination will give the experimenter freedom to move to a new class of experiments.