Preliminary design for a 30 MeV, 500 , μA H- cyclotron

The proposed cyclotron is the first step of a program aiming at developing high intensity, energy efficient cyclotrons. The 30 MeV, 500 μA, H^- cyclotron is designed to use less than 100 kW main power. The magnet has four 54 degree straight sectors on a common yoke. The hill gap and field are 3 cm and 1.8 T. The valley gap and field are 110 cm and 0.04 T. Two 30 degree dees operate at 93 MHz with H = 6. The vertical λ/2 cavities are located entirely in the valleys. The H^- are produced by an external E.C.R. source biased at 50 kV. They are injected axially using a permanent magnet periodic focusing channel. The prototype is expected to deliver beams in 1988.