| Paper | Title | Page |
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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. | ||
| 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. | ||