3He极化与储运的关键理论与技术研究

由于3He极化气体在材料、生物、医疗、国防等多个领域有着潜在的应用价值，因此越来越受到世界各国科技界的重视。我国在3He极化方面起步较晚，在国家层面上（主要科学院系统）推进也只是近几年的事情。目前，提高极化效率和极化度，降低极化腔壁和气体储运器皿壁的退极化仍然是需要解决的重要问题。我们拟在已建成的3He极化平台上，开展碱金属Rb、K与3He之间角动量交换的过程研究，确定角动量交换的碰撞截面，为进一步提高极化度提供理论依据；开展3He极化气体与材料表面的相互作用研究，弄清不同材质对3He极化气体的退极化机理，寻找适宜于3He极化的国产玻璃材料，以取代用于极化腔的GE180玻璃；开展储运材料和磁场梯度均匀度对退极化的研究，设计简便、廉价的极化气体储运装置，使3He极化气体的应用尽快成为可能。

There has been growing interest in the field of 3He polarized gas due to its potential application in materials, biology, medical treatment, national defense, and other fields. The scientific community in China(Mainly the academy of sciences) has engaged in the field relatively late and there are still critical challenges that prevent the translation of this technology into application. One of the key areas is to improve the efficiency and degree of polarization, while reducing the depolarization on the wall of polarization chambers and the gas storage/transportation vessels. We aim to study the angular momentum exchange process between the alkali metals (e.g., Rb and K) and 3He on the built 3He polarization target platform. The cross section of the angular momentum exchange during collision will be determined, which will provide theoretical basis for further improving the polarizability of 3He gas. Moreover, we will investigate the mechanism of depolarization using different materials with the goal of replacing GE180 glass polarization chamber with domestic materials that are suitable for 3He polarization. Additionally, we will study the impact of storage and transportation materials and gradient uniformity of magnetic field on depolarization. Results from this project will inform the design of polarized gas storage and transportation devices that are economical and easy to deploy, thereby, greatly accelerate the translation of 3He polarization technology in the medical field and beyond.