低温液体中绝缘表面的电荷效应
Electric Charging Effects on Insulating Surfaces in Cryogenic Liquids
AI总结：
本文提出一种结合低温恒温器和电光克尔效应的新技术，研究低温液体中强电场下绝缘表面的离子吸附/解吸，并测量PMMA介电常数，探讨其对中子电偶极矩实验的影响。
摘要：
本文提出了一种新技术，用于研究在低温液体中强电场存在下，绝缘表面上离子和电子的吸附与解吸行为。实验设计由一个紧凑型低温恒温器与一个灵敏的电光克尔装置耦合而成，用于监测电场的稳定性。实验比较了氮离子和氦离子在聚甲基丙烯酸甲酯（PMMA）表面以及涂覆有氘代聚苯乙烯和氘代聚丁二烯混合物的PMMA表面上的行为。实验明确观察到了这些表面上的离子积累和去除过程。在数据精度范围内，两种表面对物理吸附离子的行为相似。该装置还用于测量PMMA在T=70 K时的（准）静态介电常数。最后，讨论了离子吸附对在低温环境中寻找中子永久电偶极矩实验（如nEDM@SNS实验）的影响。
英文摘要：
This paper presents a new technique to study the adsorption and desorption of ions and electrons on insulating surfaces in the presence of strong electric fields in cryoliquids. The experimental design consists of a compact cryostat coupled with a sensitive electro-optical Kerr device to monitor the stability of the electric fields. The behavior of nitrogen and helium ions on a poly(methyl methacrylate) (PMMA) surface was compared to a PMMA surface coated with a mixture of deuterated polystyrene and deuterated polybutadiene. Ion accumulation and removal on these surfaces were unambiguously observed. Within the precision of the data, both surfaces behave similarly for the physisorbed ions. The setup was also used to measure the (quasi-)static dielectric constant of PMMA at T = 70 K. The impact of the ion adsorption on the search for a neutron permanent electric dipole moment in a cryogenic environment, like the nEDM@SNS experiment, is discussed.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
