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Liquid nitrogen level meter for high-temperature superconductor (HTS) 被引量:1
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作者 PARK Heecheol JEONG Hwanjun +3 位作者 LEE Changyeung KIM Purn CHO Jangwon KIM Seokho 《Journal of Central South University》 SCIE EI CAS 2012年第11期3100-3104,共5页
Many kinds of high temperature superconductor (HTS) power machines such as HTS cable, HTS fault current limitcr and HTS magnet are cooled by liquid nitrogen. The level of liquid nitrogen should be monitored and cont... Many kinds of high temperature superconductor (HTS) power machines such as HTS cable, HTS fault current limitcr and HTS magnet are cooled by liquid nitrogen. The level of liquid nitrogen should be monitored and controlled to ensure the thermal stability and the dielectric strength as well. To measure the level, capacitance method and differential pressure method are usually used. However, each method has installation difficulties and measurement errors for unsteady state operation with varying system pressure. A new liquid level meter using a 2G HTS conductor is described, which has similar structure with the liquid helium level meter with NbTi filament. The level meter is fabricated with a parallel connected heater, which helps the separation of the superconducting region and normal region, considering the critical temperature, large heat capacity of conductor and cooling characteristics. The level of liquid nitrogen can be obtained from the measured voltage signal along the 2G HTS conductor. Design, fabrication and test results of the new liquid nitrogen level meter are presented. 展开更多
关键词 high temperature superconductivity liquid nitrogen level meter QUENCH
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Development of the liquid level meters for the PandaX dark matter detector
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作者 胡捷 龚昊伟 +6 位作者 林箐 倪凯旋 谈安迪 魏月环 肖梦蛟 肖翔 赵力 《Chinese Physics C》 SCIE CAS CSCD 2014年第5期53-57,共5页
The two-phase xenon detector is at the frontier of dark matter direct search. This kind of detector uses liquid xenon as the sensitive target and is operated in two-phase (liquid/gas) mode, where the liquid level ne... The two-phase xenon detector is at the frontier of dark matter direct search. This kind of detector uses liquid xenon as the sensitive target and is operated in two-phase (liquid/gas) mode, where the liquid level needs to be monitored and controlled in sub-millimeter precision. In this paper, we present a detailed design and study of two kinds of level meters for the PandaX dark matter detector. The long level meter is used to monitor the overall liquid level while short level meters are used to monitor the inclination of the detector. These level meters are cylindrical capacitors that are custom-made from two concentric metal tubes. Their capacitance values are read out by a universal transducer interface chip and are recorded by the PandaX slow control system. We present the developments that lead to level meters with long-term stability and sub-millimeter precision. Fluctuations (standard deviations) of less than 0.02 mm for the short level meters and less than 0.2 mm for the long level meter were achieved during a few days of test operation. 展开更多
关键词 liquid level meter XENON dark matter
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