Speaker
Dr
Masatoshi Arai
(J-PARC Center JAEA)
Description
J-PARC MLF was designed to be a 1 MW spallation neutron source. Presently the power of the proton accelerator is 300 kW with a very stable operation at 94%, a world-class stability, after recovering in January 2012 from the damages by the devastating disaster happened in March 2011.
In order to increase the proton power over 300KW, we need an improvement on the target to mitigate the pitting on the Hg-target container. Now we have been injecting helium micro bubbles in the target. The Laser Doppler vibrometory from the container showed us that vibration on the proton bombardment has obviously reduced by the injection.
20 instruments have been already funded. 16 of them are operated for user program and four instruments are under either commissioning or construction. Operational time for user program in JFY2012 was about 180 days, and we have received more than 550 experimental proposals from users.
We have introduced innovative instrument design, such as multi-Ei measurement, pulse-shaping chopper at beam ports viewing the coupled moderator, intensive background suppression design, event-recording data acquisition etc. Instruments perform quite well at world class and users are very much enjoying experiments.
World-class scientific outputs have been already created in various scientific fields, ranging from Li-battery science to bio-molecular science. Since J-PARC is internationally open for users, we have got experimental proposals from abroad more than 10% of the whole proposals. More than 30% of proposals have come from industries, such as Toyota, Nissan, Honda, Panasonic and other big industries. This fact has revealed a new horizon has come in the neutron scattering science in the 21 century. We are expecting the number of proposals and users will be improved more than three times at 1MW in three years’ time.
Primary author
Dr
Masatoshi Arai
(J-PARC Center JAEA)
