RIKEN Nishina Center, Wako, Japan
SHI Accelerator Service Ltd., Tokyo, Japan
RIKEN Nishina Center, Wako, Japan
SHI Accelerator Service Ltd., Tokyo, Japan
CNS, Saitama, Japan
THM1C01
RIKEN/RARF/CC, Saitama, Japan
RIKEN Nishina Center, Wako, Japan
| Paper | Title | Page |
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| MOPA09 | RIKEN Ring Cyclotron (RRC) | 54 |
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| The RIKEN Ring Cyclotron (RRC) has been in stable operation over 28 years, and has been used for supplying many types of heavy-ion beams for various experiments. Since 2007, it has also been used for supplying beams to the three Ring Cyclotrons at the Radioactive Isotope Beam Factory (RIBF). The RRC has three types of injectors: the AVF cyclotron for comparatively light ions, variable-frequency linac for heavy-ions (RILAC), and the RIKEN Heavy-ions Linac 2 (RILAC2) for using high-intensity very-heavy ions. The total operation time of the RRC is more than 4000 h/year. Recently, some problems caused by age-related deterioration have often been occurring in the RRC. Some main coils of sector magnets had a sign of layer short. Two Magnetic Deflection Channels and some electrodes of Electrostatic Deflection Channel were damaged by some beam-loss. Several leaks of vacuum have happened at a feed-through of trim coils in the E-sector, at a bellows between the Resonator No.2 and the S-sector magnet, and at some copper cooling water pipes in the Resonator No.1 and the Resonator No.2. These present statuses of the RRC are presented in this paper. | ||
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| WEPB01 | Status Report on the Operation of the RIBF Ring Cyclotrons | 191 |
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| Operational status of four ring cyclotrons (RRC, fRC, IRC, SRC) from August 2014 to July 2015 is reported. We are engaging in the improvements and adjustments for increasing beam intensities year after year, and maintenances for the stabilization of beam supply. In these contributions, we will report the past performances of accelerated beams, statistics of operational and tuning time on corresponding period, as well as failures and copings with them. | ||
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THM1C01 |
Further Improvement of Performance of RIKEN 28GHz SC-ECRIS and Search for the Optimum Structure of ECR Ion Sources | |
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| To search for the optimum structure of the ECR ion source, we studied the effect of the main parameters (magnetic field, etc) of RIKEN SC-ECRIS on the beam intensity for various heavy ions (Ar~U) with 18 and 28GHz. In the systematic studies, we observed that the beam intensity is strongly dependent on these parameters. For examples, optimum value of Bmin for maximizing the beam intensity was dependent on the microwave frequency (~0.8Becr (18GHz), 0.6~0.65Becr (28GHz)) and gas pressure. We found that the optimum value of Br to maximize then beam intensity is strongly dependent on Bmin in a certain condition. Based on these studies, even though we used the magnetic field lower than the ordinary "High-B mode", we obtained more than 200euA of U35+ at lower RF power. We could dramatically reduce the consumption rate of metal U form ~8.6 to ~2.8mg/h to produce 150euA of U35+. In this contribution, we present the effect of main parameters on the beam intensities for various heavy ions and mechanisms in detail. We show how to optimize the performance to obtain the intense U beam. Based on these studies, we also describe the optimum structure for higher microwave frequency. | ||
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Slides THM1C01 [2.407 MB] | |
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