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590 MeV Ring Cyclotron.
Description
The Ring cyclotron is a seperated sector cyclotron with a fixed beam energy of 590 MeV, built by PSI and commissioned in 1974. The 72 MeV beam from the injector 2 cyclotron, enters from the back of the cyclotron and is injected into an orbit in the center of the Ring, accelerated over 186 revolutions and extracted at the full energy in the foreground of the picture.The design is based on criteria that allow operation at very high beam intensities: an open structure of four large and powerfull RF-cavities providing a high acceleration voltage, and a flat-top cavity operating at the third harmonic of the accelerating RF-voltage. The resulting strong, phase-independent energy gain per revolution gives good turn separation and hence beam extraction with low beam losses. This is a mandatory condition for high current operation in a cyclotron.
| Characteristics | Value |
| Injection Energy | 70-72 MeV (37.1% of light speed) |
| Extraction Energy | 590 MeV (78,9% of light speed) |
| Extraction Momentum | 1.2 Gev/c |
| Energy spread (FWHM) | ca. 0.2 % |
| Beam Emittance | ca. 2 pi mm x mrad |
| Beam Current | 2.2 mA DC |
| Accelerator Frequency | 50.63 MHz |
| Time Between Pulses | 19.75 ns |
| Bunch Width | ca. 0.3 ns |
| Extraction Losses | ca. 0.03 % |
| Mass of Sektormagnet | 8 x 250.000 kg |
| Magneticfield (Stiffness T x m, middle) | 0.9 T (4.0, 0.6 T) |
| Radius at injection | 2100 mm |
| Radius at extraction | 4460 mm |
| Mass of Resonator | 4 x 25.000 kg |
