A compact ultra-clean system for deploying radioactive sources inside the KamLAND detector

作者：Banks T I^*; Freedman S J; Wallig J; Ybarrolaza N; Gando A; Gando Y; Ikeda H; Inoue K; Kishimoto Y; Koga M; Mitsui T; Nakamura K; Shimizu I; Shirai J; Suzuki A; Takemoto Y; Tamae K; Ueshima K; Watanabe H; Xu B D; Yoshida H; Yoshida S; Kozlov A; Grant C; Keefer G; Piepke A; Bloxham T; Fujikawa B K; Han K; Ichimura K; Murayama H; O'Donnell T; Steiner H M; Winslow L A; Dwyer D A; McKeown R D; Zhang C; Berger B E

来源：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment , 2015, 769: 88-96.

DOI：10.1016/j.nima.2014.09.068

• Large detector systems for particle and astroparticle physics
• Detector alignment and calibration methods (lasers
• Sources, Particle-beams)
• Scintillators, Scintillation and light emission processes (solid, Gas and liquid scintillators)

We describe a compact, ultra-clean device used to deploy radioactive sources along the vertical axis of the KamLAND liquid-scintillator neutrino detector for purposes of calibration. The device worked by paying out and reeling in precise lengths of a hanging, small-gauge wire rope (cable); an assortment of interchangeable radioactive sources could be attached to a weight at the end of the cable. All components exposed to the radiopure liquid scintillator were made of chemically compatible UHV-cleaned materials, primarily stainless steel, in order to avoid contaminating or degrading the scintillator. To prevent radon intrusion, the apparatus was enclosed in a hermetically sealed housing inside a glove box, and both volumes were regularly flushed with purified nitrogen gas. An infrared camera attached to the side of the housing permitted real-Lime visual monitoring of the cable's motion, and the system was controlled via a graphical user interface.

• 出版日期2015-1-1