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M. LACROIX~, A. NINANE~, G. RUCKEWAEF~, s. ZAREMBA~ 'Ion Beam Applications s.a. Chemin du cyclotron. 2 -1348 LOUVAIN-LA-NEUVE tCentre de Recherches du cyclotron -LOUVAIN-LA-NEUVE-Belgium CYCLONE 30 is a 30 MeV, H-cyclotron for radioisotope production, desbned for extremely high extracted beam intensity (500 pA) and low power consumption (less than 100 kW with a 15 kW extracted beam). The CYCLONE 30 prototype has now been operating for trvo years at LOUVAIN-LA-NEUVE and has achieved aU design goals while demonstrating very high reliabili!y. The mapr events in its development are reviewed. The data gathered so far Qive general basic trends for future designs : a 70 MeV, 2 mA machine desan study is presented. -Detailed design descriptions of CYCLONE 30 appear elsewhere [l], [2], [3] and are only summarized here (fig. 1). J 3 Q u d A General layout of CYCLONE 30CYCLONE 30 is a fixed field, fixed frequency, isochronous cyclotron designed to accelerate intense beams of H' ions up to a maximum energy of 30 MeV. The unusual magnet design combines the advantages of separated sector cyclotrons and solid pole cyclotrons. Energizing the cyclotron maanet requires as little as 7 kW. The magnetic field is adjusted during the manufacture by azimuthal shimming of the pole edges, providing a stable and highly isochronous field profile.The rf system consists of two dees connected at the centre and operating on the 4th harmonic of the particle revolution frequency. The half-wavelength resonators are entirely located in the magnet valleys. The total power needed to obtain the nominal 50 kV dee voltage is only 5.5 kW per dee. The final stage rf amplifier, a grounded orid triode capable of delivering 26 kW. is attached to the cyclotron structure and coupled to the dees through a capacitor.The negative hydrogen ions are produced by an extemal multicusp arc discharge ion source, biased at 29.5 kV. The axial injection system shown on fig. 2 includes two 15" bending magnets to select the appropriate beam species, a steering magnet, an electrostatic "EINZELL" lens, a beam stopper, a double gap rf buncher, a magnetic "GLASER" lens located in the cyclotron yoke and an electrostatic helicoidal inflector. m: The axial injection systemThe H-ions are extracted from the cyclotron by stripping through a thin carbon foil (40 mg/cm2). Continuously adjustable energy from 15 to 30 MeV is achieved by varying the radial position of the foil. Two beams may be extracted simultaneously at unrelated energies by means of two foils (one at each side).