论文标题
连续流动液氦磁显微镜低温恒温器作为封闭循环系统的操作
Operation of a Continuous Flow Liquid Helium Magnetic Microscopy Cryostat as a Closed Cycle System
论文作者
论文摘要
我们证明了使用模块化的冷冻冷却系统（Coldedge Technologies，Stinger）在封闭循环操作中的连续流动液氦磁性低温恒温器（牛津仪器，Microstat MO）的成功操作。对于系统操作，我们已经开发了一种定制的气体处理歧管，我们表明，尽管冷冻冷却能力要求的冷却能力较低，但磁性低温恒温器仍可以稳定的方式操作。我们提供了气体处理歧管的设计，以及在样品处的冷却时间，磁场升值速率和振动方面对系统性能进行详细分析。可以在10小时内达到基本温度，而超导磁铁可以以0.5 t/min的坡道速度通电。振动是用均值测量的，并显示均方根的幅度在5 nm的阶，允许将系统用于敏感的磁显微镜实验。
We demonstrate successful operation of a continuous flow liquid helium magnetic cryostat (Oxford Instruments, Microstat MO) in closed cycle operation using a modular cryocooling system (ColdEdge Technologies, Stinger). For the system operation, we have developed a custom gas handling manifold and we show that despite the lower cooling power of the cryocooler with respect to the nominal cryostat cooling power requirements, the magnetic cryostat can be operated in a stable manner. We provide the design of the gas handling manifold, and a detailed analysis of the system performance in terms of cooling times, magnetic field ramping rates and vibrations at the sample. Base temperature can be reached within 10 hours while the superconducting magnet can be energized at a ramping rate of 0.5 T/min. Vibrations are measured interferometrically and show amplitudes with a root mean square on the order of 5 nm permitting the use of the system for sensitive magnetic microscopy experiments.
