Abstract
At the Hadron Experimental Facility in J-PARC, we inject a 30-GeV proton beam into a gold target to produce secondary particle beams required for various particle and nuclear physics experiments. The gold target is placed in a hermetic chamber, and helium gas is circulated in the chamber to monitor the soundness of the target. The radioactivity in helium gas is continuously monitored by gamma-ray detectors such as a germanium detector and a NaI(Tl) detector. Beam operations with those target-monitoring systems were successfully performed from April to June and October to December 2015, and from May to June 2016. In this paper, the details of the helium gas circulation system and gamma-ray detectors and the analysis results of the obtained gamma-ray spectra are reported.
Highlights
The Hadron Experimental Facility (HEF) is one of the experimental facilities in Japan Proton Accelerator Research Complex (J-PARC) [1] located in Tokai, Ibaraki, Japan
The proton beam accelerated up to 30 GeV is slowly extracted from the Main Ring for 2 seconds within 6 or 5.52 seconds-accelerator cycles and injected into the gold target [3]
The gold target is bonded onto a watercooled copper base by the heat isostatic pressing (HIP) method
Summary
The Hadron Experimental Facility (HEF) is one of the experimental facilities in Japan Proton Accelerator Research Complex (J-PARC) [1] located in Tokai, Ibaraki, Japan. In the HEF, we inject the proton beam into a gold target to produce secondary particles such as kaons and pions and use them for various particle and nuclear experiments [2]. The proton beam accelerated up to 30 GeV is slowly extracted from the Main Ring for 2 seconds within 6 or 5.52 seconds-accelerator cycles and injected into the gold target [3]. The gold target is bonded onto a watercooled copper base by the heat isostatic pressing (HIP) method.
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