Abstract

An isochronous low energy cyclotron for accelerating protons to a fixed energy of 3 MeV is under construction at Eindhoven University of Technology. The objectives of this project are: (1) to study the central region geometry, (2) to study space charge effects and their influence on beam properties, (3) to produce intense ion beams with low energy spread, (4) to apply it as a microprobe facility for element analysis. The main features of this cyclotron are a fourfold symmetrical magnetic AVF field; a double 50° dee system for 2nd harmonic excitation, as well as a double 30° dee system for 6th harmonic flat topping. The gap between the pole faces varies from 33.3 to 50.0 mm and the pole diameter is 420 mm. Servicing is done easily by lifting the upper part of the magnet yoke. The total weight is 3 t and the power consumption amounts to 20 kW. The magnetic field needed a few corrections to the pole pieces before it met the design specifications. Its high frequency behaviour is being observed in a full-scale model at reduced voltages.

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