Columbia University is converting the 18‐year‐old 384‐MeV synchrocyclotron at its Nevis Laboratories to raise the energy to between 500 and 600 MeV and increase the internal beam current from about 1 microampere to 10–50 microamperes. A new longduty‐factor external beam of 5–40 microamperes is expected to be used for most experiments and will produce a flux of pions and miuons 100–1000 times the present value. The type of experiments that can be performed with such a meson facility have been described in Louis Rosen's article “Meson Factories,” PHYSICS TODAY, December 1966, page 21.

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