Abstract
A pion-muon channel has been designed for internally generated mesons from the NASA Space Radiation Effects Laboratory 600 MeV synchrocyclotron. The channel, similar to those at CERN and Chucago, consists of three sections: a main section containing 24 identical 11” bore quadrupole magnets, an inout matching section consisting of a quadrupole doublet for matching to the meson emittance from the cyclotron, and an output bending magnet. Computer programs using quadrupole transfer matrices including linear magnetic fringe field effects have been used to optimize the meson flux. The main section quadrupoles have terraced pole tips and achieve a gradient of 2.4 kG/in. Movable channel mounting has been incorporated with pillared shielding to facilitate reorientation of the channel with respect to the cyclotron to change the mean pion momentum entering the channel. 740 stopped μ − per gram sec and 1.500 stopped π − per gram sec were observed into a 6″ × 6″ target.
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