The 12th Symposium on Accelerator Science and Technology, Wako, Japan 1999

Proposal of Radioactive Isotope and Nuclear Structure Study Facility (RINSS)

MingwuFan
China Institute of Atomic Energy
INTRODUCTION
In order to promote peaceful use of nuclear technology,
fundamental and applied research of nuclear physics in thisforemost frontier, Radioactive Isotope and Nuclear Structure
Study Facility (RINSS) has been proposed by China 1n£;titute ofAtomic Energy (CIAE). The facility is an extension of theexisting HI-13 tandem accelerator that put into operation in1986. A high intensity 100 MeV proton cyclotron will be
adopted for the purpose of R & D of radioactive isotope
production, study of nuclear structure and radiation physics.
Also it will be used for the production of radioactive nuclei to be
isotopically separated by an on·line mass separator and injected
into the pre--existing HI-13 tandem accelerator. A
superconducting heavy ion linear accelerator (LINAC) will be
used for post-acceleration. Thus, high intensity and high energy
resolution RNBs of A-up to 140 can be obtained with energies
above the Coulomb barrier.

Proposed RINSS is a hybrid project consisting of three
accelerators: The pre-accelerator is a 100 MeV high beam
intensity proton compact cyclotron, then there is a existing
l3MV tandem and final post accelerator is a superoonducting
linac. The part of reason of choosing a cyclotron for the preaccelerator is CIAE has good experience for cyclotronrll.
The proposed proton cyclotron will provide lOOMeV,
200p.A proton beams, as shown in Fig. 2. It is a compact
machine accelerating negative hydrogen and 70 to 100 MeV
proton will be extracted by a stripper. The machine combines theadvantages of solid. pole and separate sector cyclotrons.
Accuracy positioning and high flutter to keep stronger focus.
There is no face coils needed since the energy of the extracted
proton is controlled by the position of stripper. Also theextraction of beam is aecomplished by change of the sign ofCharge State of accelerated particle.

Im'tlstigation has shown that the RINSS is
technologically feasible by China Institute of AtOmic Energy.
The RINSS is an advanced and competitive facility on the world.
It is a major tool for searching new radioactive isotopes and usedfor study of nuclear structure physics, nuclear astro-physics,
nuclear reaction mechanisms, atomic physics, material science,life science as well as other applications of nuclear physics. TheRINSS will be a facility belonging to a national laboratory
accessible for users in China as well as from foreign coWltries.
The RINSS will be built in a five-year construction period· afterfund.
TECHNICAL CONSIDERATIONS
The plan view ofRINSS is shown in Fig. I.

Fig. 2 lOOMeV, 200 ll A cyclotron

The loss of the beam will be negligible in this way when
the beam is extracted. The parameters of the machine are listed
Fig. 1 Layout of RINSSon table 1.

-152-The 12th Symposium on Accelerator Science and Technology, Wako, Japan 1999

mass resolution will be 1300. The other section is an isobar
separator with resolution 20000. The structure of the equipment
is shown as Fig. 3

Table 1, Parameters ofCYCIAEIOO
extracted----·- ... ----------------·-------··--.-.-----····----.......
accelerated
Extracted intensity
Exit port
energyMagnet structure
Field under hill
Field between valley
Radius of Pole
Weight of magnet
Magnet coilWeight of coil
Number of dee-·-···,~~- '"'"''.

J?f.()!~----------­minus hydrogen2001.1 A
275-100 MeV
4 sectors
1.45T
0.15
1920 mm
475 T
50000 AT
12 T
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95 i"o91""":: Annly~;;er~-"(~The extracted beam will be used either for theexperiments to do R&D study of isotope production or tobombard a thick targets for producing radioactive nuclei, thenisotopically separated by an on-line mass separator. Charged
ions of the selected isotopes \\'ill be produced by a target/source.
The ions become negatively charged after passing through an ion
exchange canal. The negative ions will be injected into the preexisting HI-13 tandem accelerator. A superconducting heavy ion
linear accelerator with energy increase of 17MeV/charge will be
used for post-acceleration. This device is calculated to be able todeliver radioactive nuclei of I 09-1 011 ions/sec. Both radioactive
nuclei and stable nuclei in the energy range from l4.5MeV/A( 12C) to 4.9MeV/A ( 133Cs) can be obtained with high resolution
and variable energies.
One of the purposes of the facility is used for theproduction of radioactive nuclei, which will then be isotopicallyseparated by an on-line mass separator and injected into the HI13 tandem accelerator. The isotope separation on line (ISOL)
technology has been developed in many laboratories in theworld. Successful experiences are expected to be used in thisequipment. ISOL system consists of target/ion source, charge
exchange canal, accelerator tubes, mass spectrometer andtransportation line. In order to reduce the loss of the radioactive
nuclei, except transportation time must be kept as short as
possible since the isotope lifetime is limited, good quality of thebeam is also expected. Good quality and enough intensity ofnegative ion injected into the tandem will ensure enoughamounts of the particles to -meet the needs of physics
experiments.
The target/source used in the facility must possess small
emmittance, high efficiency, variety of ions, remote assemblingand disassembling. The exotic radioactive nuclei are generated
by the reaction of high-energy proton beam from the cyclotron
and target material. To make the exotic radioactive atoms
diffuse easily from the target material, opposite physical andchemical properties of the exotic atoms to the target material areexpected. The temperature on the target/ion-source is about13oo·c-2ooo·c.

Fig. 3 The layout of ISOL

HI-13 tandem accelerator put into operation ten years
ago. 5 MeV/Amu beams up to around mass A<40 can beaccelerated. -ln order to extend the region of stable andradioactive ion species with energy high than relative coulomb
barrier, a superconducting linac after the tandem will be built asa booster with RF 108 MHz

FEATURES OF RINSS
RINSS is multi-purpose plan.
l) Used for RNBs
The energies of the exotic beams from the RlNSS
compares favorably with all of the existing and planned ISOLfacilities, except for the IsoSpin Lab (ISL) in the mass range ofA>40 and Japanese JHP in the mass range of A>70. Therefore,RINSS will be a very competitive world-class radioactive
nuclear beam facility.
2) Operation in five different modes.

a) Single cyclotron operation. In this mode 70-lOOMeV
high intensity proton beams will be available for the first time inChina. Fast neutrons can be produced with intensity up tolxl014 neutrons/sec.
b) Single tandem operation.
c) Combination of tandem and linear accelerator. Theof stable beams can be increased greatly.
range
energyThe mass spectrometer consists of two sections. One of themseparates useful nuclei from other foreign ion. This section
consists of a 90 o dipole bending magnet with radius 1. 3 m. Its-153-The 12th Symposium on Accelerator Science and Technology, Wako, Japan 1999d) Combination of cyclotron and tandem. Radioactive
nuclear beams with A<40 can be provided for nuclear physics
research.

beams, but also improve the performance of the stable nuclear
beams. Therefore, RlNSS will greatly extend the opportunities
available for the researches in nuclear structure, nuclear
reactions and application of nuclear technique.

e) Combination of three accelerators. The mass range ofthe accelerated radioactive beams with energy above theCoulomb barrier can be increased from 40 to 140.
REFERENCE
Fig.4 shows the main research areas that can be reachedwith the different operation modes. The facility will not only
make the world -class capability of the radioactive nuclear

Mingwu Fan, Initial operation of CYCIAE 30, Proc. of ChinaJapan accelerator symposium, 1996

I Ionlsource II.lStable nucleiICyclotron~

Thick targetandI sotope separator

70 MeV proton irradiation
Material science
Irradiation resistively
Fast neutron source with 1014nls
Nuclear data measurement
Fast neutron cancer therapy
Radioisotope production~ Radioactive nuclei

I+Tandem

Low energy nuclear physics (A<40)
Nuclear data measurement
Nuclear astrophysics
Highly ionized atomic physics
Material science
Irradiation resistively .
Life scienceFig.4 Main research areas ofRlNSS.

-154-Super conducting LINAC ..

J

Low energy heavy ion physics(A<40)

Highly ionized atomic physics
Material science

Irradiation resistively
Life science