极低振动高温度稳定性氦气蓄冷系统

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• 英文论文题名：Helium Pot System with ultra low Vibration and High-precision Temperature Stablization
• 论文作者：何超峰 ; 卞荣耀 ; 李阳 ; 丁怀况 ; 丁先庚 ; 武义锋
• 英文论文作者：He Chaofeng ; Bian Rongyao ; Li Yang ; Ding Huaikuang ; Ding Xiangeng ; Wu Yifeng ; The 16th Research Institute of China Electronics Technology Group Corporation ; Anhui Vacree Technologies Co. ; Ltd
• 年：2016
• 作者机构：中国电子科技集团公司第十六研究所;安徽万瑞冷电科技有限公司;
• 论文关键词：制冷机停机 ; 氦气腔 ; 极低振动 ; 高温度稳定
• 英文论文关键词：cryocooler deactivation ; Helium Pot ; ultra low vibration ; high-precision Temperature Stablization
• 会议召开时间：2016-10-21
• 会议录名称：安徽省第四届（2016年）“卓凌杯”真空科技青年创新大赛暨学术研讨会论文集
• 语种：中文
• 分类号：TB657
• 学会代码：AHZK
• 会议名称：安徽省第四届（2016年）“卓凌杯”真空科技青年创新大赛暨学术研讨会
• 会议地点：中国安徽安庆
• 主办单位：安徽省真空学会
• 学会名称：安徽省真空学会
• 页数：12
• 文件大小：728k
• 原文格式：D
• 会议级别：地方

摘要

建立了一套在制冷机停机状态下仍能够维持样品温度低于10K的低温系统。该系统以4K GM低温制冷机为冷源,低温氦气腔安装在制冷机二级冷头上,样品安装座与低温氦气腔底部法兰连接,样品安装在样品安装座上,为提高样品的温度稳定性,样品和样品安装座之间设置热阻材料。制冷机停机后,冷源消失,低温氦气腔温度升高,样品控温功率逐渐减小,从而维持样品温度稳定性。采用这种在制冷机停机状态下利用低温氦气蓄冷取代低温液体或固体维持样品温度的方法,一方面隔绝了制冷机开机状态下振动对样品位置稳定性的影响,另一方面利用制冷机的循环工质氦气,大大减少了连接管路,简化了低温系统复杂性,从而提高了可靠性。低温氦气腔直径67mm,长度288mm,内部充入1.55MPa高纯氦气,在开机20min,停机13min循环进行中,热负荷为100m W的样品能够长时间维持在7K±2m K。在制冷机停机状态下,样品振幅<1um。
A system for maintaining a sample at constant temperature below 10 K after stopping the cooling source is demonstrated. In this system, the cooling source is a 4 K GM cryocooler that is joined with the sample through an extension that consists of a helium pot and a resistive medium. Upon deactivating the cryocooler, the power applied to a heater located on the sample side of the resistive medium is decreased gradually to maintain an appropriate temperature riseacross the resistive medium as the helium pot warms. The sample temperature is held constant in this manner without the use of solid or liquid cryogens and without mechanically disconnecting the sample from the cooler.Shutting off the cryocooler significantly reduces sample motion that results from vibration and expansion/contraction of the cold head housing. The reduction in motion permits certain procedures that are very sensitive to sample position stability, but are performed with limited duration.A proof-of-concept system was built with an extension 67 mm in diameter and 282 mm in length that includes a helium pot pressurized to the cryocooler's charge pressure. A sample with continuous heat dissipation of 100 m W is maintained at 7 K with a cryocooler duty cycle of 20 minutes on and 13 minutes off.

引文

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