| Paper | Title | Page |
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| MOPP112 | Beam Dynamics of Multi Charge State Ions in RFQ Linac | 317 |
| SUPG015 | use link to see paper's listing under its alternate paper code | |
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| Laser ion source with DPIS (Direct Plasma Injection Scheme) is a promising candidate for a pre-injector of the high-intensity accelerator. Eliminating LEBT (Low Energy Beam Transport) where the space charge effect is severe, DPIS provides high current ion beam from laser plasma at the entrance of a RFQ linac and ion beams are injected directly into the RFQ linac. However, the injected beam consists of multi charge state ions and their behavior in RFQ linac has not been well understood. In this research, we study the beam dynamics of multi charge state ions in a RFQ. Using the result of computer simulation, a set of 100MHz 4-rod RFQ vanes, which accelerates Al 12+ ion among various charge states of aluminum ions from 8.9 keV/u to 200 keV/u, is newly designed and fabricated to be tested with beams. The result of beam acceleration test using the vane will be reported. | ||
TUPP074 |
Study on Fabrication of Superconducting RF 9-cell Cavity for ILC at KEK. | |
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| We had constructed the Cavity Fabrication Facility (CFF) for the fabrication of superconducting RF cavity at KEK from 2009 to 2011. In the facility, we installed a deep-drawing machine, a half-cup trimming machine, an electron-beam welding machine, and a chemical etching room in one place. We started the study on the fabrication of 9-cell cavity for International Linear Collier (ILC) from 2009 using this facility. The study is focusing on the cost reduction with keeping high performance of cavity, and the goal is the establishment of mass-production procedure for ILC. We finished the fabrication of two 9-cell cavities by using tools, machines, and equipment of this facility. This article reports the current status of the studies on fabrication of cavity, including the results of vertical tests for the 9-cell cavities which were fabricated in this facillity. | ||
TUPP102 |
Compact Accelerator-driven Neutron Sources in Japan | |
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| In Japan compact accelerator-driven neutron sources were built under activity of JCANS (Japan Collaboration on Accelerator-driven Neutron Sources). Now, there are 4 accelerator-driven neutron sources used for neutron science; HUNS (Hokkaido University Neutron Source), KUANS (Kyoto University Accelerator-driven Neutron Source), RANS (RIKEN Accelerator-driven Neutron Source), and NUANS (Nagoya University Accelerator-driven Neutron Source). HUNS has been used for neutron science for a long time and still actively used for imaging, small angle scattering, device development and so on. KUANS has been proved to be useful for imaging and new development is underway for reflectometry. RANS is mainly devoted to industrial ap plications and used for imaging now. NUANS is now under construction for test facility for cancer therapy (BNCT). These activity is also supported by UCANS (Union of Compact Accelerator-driven Neutron Sources). Here, we present our overall activity of JCANS. | ||
| THPP075 | Development of Superconducting Spoke Cavity for Electron Accelerators | 1030 |
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Funding: This work was supported by Photon and Quantum Basic Research Coordinated Development Program from the Ministry of Education, Culture, Sports, Science and Technology, Japan. We have launched a development program of a superconducting spoke cavity for electron acceleration, in order to realize a compact industrial-use X-ray source with the laser-Compton scattering. Efforts for optimizing a cavity design by the electromagnetic field simulation, tracking of multipactor electrons and mechanical property calculations have been continued so far. The optimization processes reached the final stage, and studies toward fabrication processes started. In this presentation, we will show results and processes of the optimization. Attempts to fabricate the spoke cavity, which have just begun, will also be presented. |
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| THPP092 | Development of Slow Neutron Accelerator for Rebunching Pulsed Neutrons | 1062 |
| SUPG019 | use link to see paper's listing under its alternate paper code | |
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| Low energy neutrons can be accelerated or decelerated by the technique of AFP-NMR with RF and gradient magnetic fields. The neutrons have magnetic moments, hence their potential energy are not cancelled before and after passage of magnetic fields and their kinetic energy change finally when their spins are flipped in the fields. Nowadays most measurements of the neutron electric dipole moment (nEDM) are carried out with ultra cold neutrons (UCN), whose kinetic energies are lower than about 300 neV, and with a small storage bottle to reduce the systematic errors. In such experiments highly dense UCNs are desired. The spallation neutron sources generate high-density neutrons, however, the pulsed neutrons with several velocities are diffused in guide tubes under long beam intervals. It is necessary to focus and rebunch UCN temporally upon the bottle by controlling their velocities in nEDM experiments at those facilities. We demonstrated such rebuncher and have been developed the advanced apparatus which makes it possible to handle broader energy range UCN. The design, measured characteristics, the experimental setup and the obtained results at J-PARC will be described. | ||
| THPP093 | Combined System of Optical Inspection and Local Grinder | 1065 |
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| Optical inspections on superconducting accelerating tubes have been playing an important role on improving their accelerating gradients. Instead of treatments on whole cavity inner surfaces to eliminate the found defects on the surfaces, the local grinding method succeeds to remove them efficiently. A combined system of the optical inspection and the local Grinding machines are fabricated. The overview of the system will be presented. | ||