1 GeV PNPI synchrocyclotron [1] provides widespread research program in nuclear and applied physics and also in a medical proton therapy and production of radiopharmacology for medicine purpose. The main parameters of a synchrocyclotron are presented in table1, and beam parameters in table 2.
After long-term improvement program the accelerator and experimental area are being represented an unique installation. Briefly the main features of 1 GeV synchrocyclotron facility can be formulated as follows.
  • For acceleration of proton up to the 1 GeV energy a unique high-frequency accelerating system with a frequency span ratio Fmax/Fmin=2.3 has been developed by means using a rotating condenser with a factor Cmax/Cmin=40 [2].
  • The electrostatic focusing in a centre of synchrocyclotron provides increasing the beam intensity up to 1 m kA [3].
  • Original system for a long burst operation of synchrocyclotron beam has been developed by means using a C-electrodes. Nonusual features is an application low power 5 kW resonance system with ferrite frequency variator and synchronization with beam as well on frequency as on phase [4].
  • 30 % efficiency non-linear regenerative extraction system has been developed with record efficiency for synchrocyclotrons with an open ion source central geometry [5].
  • Secondary beam system consists of p1-channel for high energy p-meson beams, p2-channel for low energy p -meson beams and for surface m -meson beam, m -channel [6].
  • Pulsed-n-beam on TOF neutron spectrometer (GNEIS) is being up to now one of the best in the world n-beam source in an energy range 10 eV up to 100 MeV [7].
  • The second proton beam with small intensity which acts in parallel with a main beam opens up opportunity to increase the patient irradiation as high as 10 times [8].
  • An additional point to emphasise is that more higher energy of a proton beam in comparison with meson factories provides an opportunity research production K-mesons and h-mesons, as well as investigations on higher energy of pion beams, nonaccessible on meson factories.