PLAN OF CYCLOTRON RESEARCH CENTER, HIROSHIMA UNIVERSITY
Y. Yoshizawa, H. Inoue, T. Horiguchi, M. Nishi*
Y. Kiso*, H. Hasai*, K. Iwatani*
H. Nishiyama* and H. Kurnarnaru**
Faculty of Science, * Faculty of Engineering
and ** Faculty of Integrated Arts and Sciences
Abstract: Plan of the center in Hiroshima University isdescribed. The accelerator is an injector AVF cyclotronof k=lOO MeV and a separate sector cyclotron of k=300 MeV.
The cyclotrons which accelerate mainly light ions will beused to study many fields of science.
Purpose of the Cyclotron Research Center is to study various
fields of physics, chemistry, biology, engineering, agriculture
and medicine, and also to supply short-lived radioisotopes. Thecenter will be placed at new campus of Hiroshima University.
The accelerator consists of the first and the second cyclotrons. The first one is an AVF cyclotron of k=lOO MeV, which iscommercially available. The second one is a separate sector
cyclotron of k=300 MeV (4 sector) as shown in Fig. 1. The
specifications of the cyclotrons are shown in Table 1.
The first cyclotron accelerates protons, light ions andlight heavy i.ons. The accelerated beam is split into two parts,
one of which is injected to the second cyclotron and the otheris led to experimental area. The second cyclotron accelerates
mainly the proton beam, but it is also designed for other lightions. The beam from the second cyclotron is again split into twoparts, which are led to experimental ro.orns and a medical irradiation room. Then three irradiations can be performed at the sametime. Plan view of the cyclotron building is shown in Fig. 2.
Main apparatus for experiments are an on-line mass spectrometer, radioisotope production systems, a vertical irradiation
system for medicine and a deta handling computer system.
Users of this accelerators are expected to be in various
fields of science at Hiroshima University and also otherTable 1.

Specifications of the cyclotrons

TypeParticle energy
ProtonsAlphas
MagnetNumber of sector
WeightExtraction radius
Main power
Oscillator
Number of oscillator
Frequency
PowerFirst cyclotron

Second cyclotron

Ordinary AVF

Separate sector

8'V 80 MeV
15'Vl00 MeV
4200 ton
93 ern300 kW
2ll'V22 MHz240 kW-123-

140~V250 MeV
130'V300 MeV

4220 x 4 ton
300 ern
120 X 4 kW
2ll'V22 MHz
150 X 2 kW

universities . The proton energy of 250 MeV fits studies of very
neutron-def icient nuclei and ~-meson produced nuclear reactions,and the medical tomography.
Following characteris tic experiments are expected, and otherexperiments are also acceptable.
a) Study of very short-lived nuclides. Atomic masses ofshort-lived nuclides are determined with the on-line mass spectrometer. Nuclear spectroscopy and Laser spectroscopy are performed
with the on-line mass spectromete r and a He jet system. Shortlived nuclides are also chemically separated by means of theelectrophor esis.
b) Solid state physics and chemistry. Lattice defect andcolour center are investigated by using the channeling effect andthe ion implantation . Radiation damage for semiconduct or andM~ssbauer effect of chemical compounds are also studied.
c) Trace analysis of environment al samples. The particle
induced X-ray emission method is applied to analysis of air andwater pollution samples by using beams accelerated with the firstcyclotron. The activation analysis is also adopted for trace
analysis of elements c, N, 0, Mo, Pb and Bi.
d) Medical study and treatment. The 150 MeV proton be.am andthe 300 MeV alpha beam are used for radiotherapy of cancer. The
proton tomography will be deyeloped by using the 250 MeV protonbeam. Many kinds of radioisotope s for the nuclear medicine areproduced with the first cyclotron,

Data takinq

1.
2.
3.

4,s.

Maqnet yoke
Maqnet pole
Vacuum chamber
Dee
Oscillator

6,

7.
8,

9.

Control room

Injection beam
Injection magnet
Extraction beam
Extraction maqnetFig. 1 Layout of theseparate sector cyclotron

L-.J__.J0

Fig. 2 Plan view of thecyclotron building-124-'""'