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GeV PNPI synchrocyclotron 
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 .
- The electrostatic
focusing in a centre of
synchrocyclotron provides increasing the beam
intensity up to 1 m kA
- 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 .
- 30 % efficiency
non-linear regenerative extraction system has
been developed with record efficiency for
synchrocyclotrons with an open ion source central
- 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 .
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 .
- 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 .
- 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.