Abstract
The purpose is the production of high intensity nucleon and meson beams for precision experiments in the lower energy region. High intensity can only be achieved practically by producing the mesons on an external target. Extraction rates of ≥ 50% are driven at and internal losses should be limited to ≤ 20μA in order to avoid too complicated remote control. Lay-out provides first shielding immediately around machine, either by pot-shaped yoke with forevacuum inside, or removable concrete. Production target is close to machine inside main shielding. Bending magnets have to be imbedded in shield wall to avoid beam contamination. For experimental flexibility experimental hall of 40 × 40 m is below level but not underground. The cyclotron would have 6 spiral sectors (max. angle 65–70°) with max. field of 21 kgauss. Two 90° dees with a 1/4λ mode are excited through the center at the second harmonic to provide acceleration of > 200 kV per turn. Ion optical devices in center limit oscillation amplitudes to very low values. Maximum energy is tentatively chosen at vr = 3/2 resonance which shall be used for extraction. For meson physics, higher energy would be considerably better, but attempt of passing resonance may diminish chances of high extraction rates.
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