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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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| MOPA12 | Status Report of the Operation of the RIKEN AVF Cyclotron | 65 |
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| The RIKEN AVF cyclotron was commissioned in 1989. Since then, it has been operated as an injector for the RIKEN ring cyclotron. The AVF cyclotron also provides low energy ion beams for the Radio-Isotope Beam separator (CRIB) of the Center for Nuclear Study (CNS), the University of Tokyo, as well as to produce RIs for commercial use. The operating time is more than 3,000 hours per year. We will report the operating status (nuclear species, energy, supply destination of accelerated ions), troubles, maintenance work, and the improvement of ion sources and diagnostics tools for the period from August 2014 to July 2015. | ||
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| MOPA24 | Performance of a Resonant Schottky Pick-up in the Commissioning of Rare-RI Ring | 98 |
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Rare-RI Ring *, ** is a storage ring dedicated for precise mass measurements of unstable nuclei to make clear the astrophysical r-process path. We employ the Isochronous mass spectrometry method in the order of 10-6. For precise tuning of the isochronous field, we developed a resonant Schottky pick-up which had a resonant cavity. We acquired the quantities by the offline test: shunt impedance, and unloaded quality factor. Using the quantities, we estimated the output signal power which is corresponding to a single ion with charge q on resonance ***. Comparing to thermal noise, present Schottky pick-up can detect a single ion with charge over 16. In June, we carried out the first commissioning of Rare-RI Ring using 78Kr38+ beam with the energy of 167 MeV/nucleon. By using the individual injection method with the fast kicker system, we succeeded in injecting, storing, and extracting 78Kr38+ ions. The Schottky pick-up successfully detected single 78Kr38+ ions. Also we confirmed that 78Kr38+ was stored for more than 2 seconds in a vacuum of 10-5 Pa. In this contribution, we will present recent status of the Schottky pick-up focusing on the results of the experiment.
* Y. Yamaguchi et al., Nucl. Instr. Meth. B 317 (2013) 629. ** A. Ozawa et al., Prog. Theor. Exp. Phys. 2012 (2012) 03C009. *** F. Nolden et al., Nucl. Instr. Meth. A 659 (2011) 69. |
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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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| WEPB17 | Status of Superconducting Quarter Wave Resonator Development at MHI | 231 |
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| MHI's activities for development of Superconducting Quarter Wave Resonator (QWR) are reported. MHI has experiences of developments and fabrications of several superconducting ellipse cavities. And now MHI is developing the superconducting QWR for heavy ion accelerators. | ||
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