[en] Beam-orbit studies were performed for the conversion of the SREL synchrocyclotron magnet for use as a room temperature, multiparticle, isochronous cyclotron. Based on model magnet measurements of field profiles for 8 to 23⁰K gauss hill fields, a four sector spiral pole tip design has been realized which allows all isotope species of heavy ion beams to be accelerated to required final energies. The total spiral angle of 38⁰ allows injection of the beams from the MP tandem into the cyclotron through a valley. The two valey RF system of 140 kV peak accelerates beams on harmonic numbers 2, 3, 4, 6 and 10 at 14 to 21 MHz. Computer calculations indicated acceptable ν/sub z/, ν/sub r/ and phase space beam characteristics and passing of resonances for typical beams considered: ¹⁶O at 8 and 150 MeV/amu, ⁶⁰Ni at 100 MeV/amu and ²³⁸U at 2.5 and 16 MeV/amu. Single turn extraction is achieved with electrostatic deflection