| Title |
High Power Target Instrumentation at J-PARC for Neutron and Muon Sources |
| Authors |
- S.I. Meigo, A. Akutsu, K. Ikezaki, T.K. Kawasaki, H. Kinoshita, M. Nishikawa, M. Ooi
JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan
- H. Fujimori, S.F. Fukuta
KEK/JAEA, Ibaraki-Ken, Japan
|
| Abstract |
At the J-PARC, spallation neutron and muon sources are injected 3-GeV proton beam with power of 1 MW extracted from 25 Hz Rapid Cycling Synchrotron (RCS). Recently several shots of the beam with equivalent power of 1 MW were successfully delivered to the targets without significant beam loss. Since the pitting erosion on the mercury target vessel utilized for spallation neutron source is known to be proportional to the 4th power of the beam current density, peak current density at the target should be kept as low as possible so that we have developed beam-flattening system by nonlinear beam optics using octupole magnets. To carry out the beam tuning efficiently, beam-tuning tool had been developed by using SAD code system. It is found that the shape of the beam can be controlled as designed. By using anti-correlated painting at the injection of the RCS, the beam was found to be shaped more flat distribution. The peak current density at the target can be reduced by 30 % with the present nonlinear optics without significant beam loss around at octupole magnets, which mitigates 76 % of the damage at the target vessel.
|
| Funding |
This work is partly supported by the MEXT Grant-in-Aid for Scientific Research (C) Grant no. 26390114. |
| Paper |
download WEPM2X01.PDF [0.853 MB / 6 pages] |
| Slides |
download WEPM2X01_TALK.PDF [9.327 MB] |
| Conference |
HB2016, Malmö, Sweden |
| Series |
ICFA Advanced Beam Dynamics Workshop on High-Intensity and High-Brightness Hadron Beams (57th) |
| Proceedings |
Link to full HB2016 Proccedings |
| Session |
Working Group E - Session 1 |
| Date |
06-Jul-16 14:00–15:40 |
| Main Classification |
Beam Instruments and Interactions |
| Keywords |
target, octupole, proton, neutron, optics |
| Publisher |
JACoW, Geneva, Switzerland |
| Editors |
Mohammad Eshraqi (ESS, Lund, Sweden); Garry Trahern (ESS, Lund, Sweden); Volker RW Schaa (GSI, Darmstadt, Germany) |
| ISBN |
978-3-95450-185-4 |
| Published |
August 2016 |
| Copyright |
|
