A compact ultra-clean system for deploying radioactive sources inside the KamLAND detector
© 2014 Elsevier B.V. All rights reserved. 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-time visual monitoring of the cable's motion, and the system was controlled via a graphical user interface.
Banks, TI; Freedman, SJ; 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, BD; Yoshida, H; Yoshida, S; Kozlov, A; Grant, C; Keefer, G; Piepke, A; Bloxham, T; Fujikawa, BK; Han, K; Ichimura, K; Murayama, H; O'Donnell, T; Steiner, HM; Winslow, LA; Dwyer, DA; McKeown, RD; Zhang, C; Berger, BE; Lane, CE; Maricic, J; Miletic, T; Batygov, M; Learned, JG; Matsuno, S; Sakai, M; Horton-Smith, GA; Downum, KE; Gratta, G; Efremenko, Y; Perevozchikov, O; Karwowski, HJ; Markoff, DM; Tornow, W; Heeger, KM; Detwiler, JA; Enomoto, S; Decowski, MP
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