1. RIKEN Superconducting Ring Cyclotron (Presented by Dr. N. Fukunishi and Mr. J. Ohnishi)
The Superconducting Ring Cyclotron (SRC) accelerates various heavy-ions beams, from deuteron to uranium ions, up to 70% of the speed of light at the highest intensity of the world. The SRC, consisting of six superconducting sector magnets and five RF cavities, is entirely sealed by pure iron and weighs 8,300 tons. Such a structure not only enables us to achieve the world’s highest bending power of K=2600 MeV but also adds the capacity for self-shielding of magnetic field and leakage radiation during the operation. Moreover, the utilization of superconducting coils drastically reduces the concumed energy; the power consumption would have been 100 times more if all the coils were based on the conventional, normal conducting technology.
2. BigRIPS (Presented by Dr. K. Yoshida and Dr. K. Kusaka)
The Superconducting Radioactive Isotope Beam Separator (BigRIPS) consists of two sections; the first stage is to separate the RI beam and the second stage is to select particles and transfer them to experimental facilities.
3. SRF Facility for SRILAC (Presented by Dr. K. Suda and Dr. K. Ozeki)
An upgrade project of the RIKEN heavy-ion linac (RILAC) is under going, aiming to to provide more intense heavy-ion beams for synthesizing new super-heavy-element. Ions with a charge-to-mass ratio larger than 1:5 will be accelerated up to an energy of more than 6 MeV/u.
The RILAC consists of an electron-cyclotron-resonance ion source, a radio frequency quadrupole (RFQ), and 12 drift tube linac (DTL) tanks. Among them, the last four DTL tanks is going to be replaced by two cryomodules, each of which will host 4 QWRs with a frequency of 73 MHz. To perform cool down test of the QWRs and fabrication of cryomodules, VT test facility and Class 1 clean room were constructed in Wako campus of RIKEN.
4. RILAC (Presented by Dr. O. Kamigaito and Dr. N. Yamada)
RIKEN Heavy Ion LINAC (RILAC) is used as the starting point for producing the heavy ion beam used in many experiments. The heavy ions are linearly accelerated using a high-frequency electric field.
In July 2004, Dr. Morita and colleagues were the first to discover the new 113th element using this accelerator.
5. RIKEN SC-ECR (Presented by Dr. T. Nagatomo and Dr. Y. Higurashi)
To increase the intensity of heavy ion beam for synthesizing new super-heavy-element, we started to construct new SC-ECRIS for RILAC. The main features of the ion source are as follows; 1) the ion source has a large size of ECR surface, 2) field gradient and size of the ECR surface can be changed arbitrarily to study these effects on the ECR plasma. Combination of six solenoid coils and a hexapole coil are used for making the magnetic mirror field to confine the plasma. The maximum magnetic field of RF injection side (Binj), beam extraction side (Bext) and radial magnetic field at the plasma chamber surface (Br) are 3.8, 2.4 and 2.1 T, respectively. The 28-GHz microwave is generated by a 10-kW gyrotron. We plan to extract the first beam this summer.
6. SCRIT (Presented by SCRIT Group)
The self-confining RI target (SCRIT) electron scattering facility has been constructed at RIKEN RI Beam Factory. The commissioning experiment was performed, and the luminosity was achieved to around 1027 cm−2 s−1 with stable ions at a 250 mA electron beam current. For the electron scattering with short-lived unstable nuclei, the radioactive isotope production was started at electron-beam-driven RI separator for SCRIT.
