核技术（英文版）
覈技術（英文版）
핵기술（영문판）
NUCLEAR SCIENCE AND TECHNIQUES
2015年
4期
040401-1-040401-6
,共1页
朱洪岩%董岚%门瓴玲%刘璨%李波
硃洪巖%董嵐%門瓴玲%劉璨%李波
주홍암%동람%문령령%류찬%리파
Wire position monitor%Alignment of cryostat%Wire position monitor calibration
Wire position monitor (WPM) is designed to monitor contraction of the cold masses during the cooling-down operation in an accelerator driven system. Because of material difference, machining error, assembly error, etc., each WPM has to be calibrated. The sensing voltage and wire position are of a nonlinear relationship, which is expressed by high order polynomial. Root mean square (RMS) of the polynomial fitting error were 3.8 μm and 7.4 μm at x and y directions, respectively. The alignment test was carried out on the beta cryostat. Optical instruments were used to verify the WPM measuring results. The differences between WPM measuring results and optical measurements were 0.044 and 0.05 mm in x and y direction, respectively. A significant asymmetric contraction was detected, and asymmetry of material was taken as the main reason through analysis.
