Beams Document 5010-v1

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Muon production target at J-PARC

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Fernanda G Garcia
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Fernanda G Garcia
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19 Nov 2015, 13:33
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19 Nov 2015, 13:33
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19 Nov 2015, 13:33
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A pulsed muon beam will be generated by a 3-GeV 333-microA proton beam on a muon target made of 20-mm thick isotropic graphite at J-PARC, muon facility. The first muon beam was successfully generated in September of 2008. Gradually upgrading the beam intensity, continuous 300-kW proton beam has been operated by a fixed target method without replacements till June of 2014. However, the lifetime of the fixed target will be less than 1 year by the proton-irradiation damage of the graphite in case of 1-MW proton beam operation. To extend the lifetime, the muon rotating target, in which the radiation damage is distributed to a wider area, had been developped. In the rotating target, the lifetime of bearing will have a dominant influence on the lifetime of the muon target. The disulfide tungsten are introduced as solid lubricant of the bearings. The muon rotating target was installed in September of 2014 and has been stabley utilized up to 500-kW proton beam operation. Simultaneou!
sly, we have developping a non-destructive measuring device to measure the radiation damage to thermal conductivity. To measure the thermal diffusivities we adopted a laser spot heating method. In summer of 2011, the 3-GeV proton irradiation effect on the thermal diffusivity of graphite was measured for the used target. In this seminar, I will introduce the muon production target at J-PARC and the non-destructive measurement of the thermal conductivity.
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