An Automatic liquid-nitrogen filling system for multiple Ge detectors

Koizumi, Mitsuo ; Oshima, Masumi; Toh, Yosuke   ; Kimura, Atsushi   ; Kin, Tadahiro; Furutaka, Kazuyoshi  ; Murakami, Yukihiro*; Osa, Akihiko  ; Ando, Shingo*

In order to reduce time and effort of the daily task of refilling Dewar vessels of Ge detectors with LN, we have developed an automatic LN filling system equipped with an LN plant. With the system, our multiple Ge detector system became almost maintenance free. Such an LN filling system is useful for moderate-scale Ge detector arrays consisting of less than 20 Ge detectors.