Hyperpolarized ³He Cell Development And Rb-Cs Mixed Polarization ¹²⁹Xe Simulation Calculation Study

Hyperpolarized gases can be widely used in various theoretical studies.Spin exchange optical pumping(SEOP)is an important method for hyperpolarization of noble gases.The results mainly contain two parts,the first part is the first completely localized high-pressure hyperpolarized ~3He optical pumping cavity(GE-180)for neutron polarization applications in China.The first part is the development of the first fully domestic high-pressure hyperpolarized ~3He optical pumping cavity(GE-180material)for neutron polarization applications and the completion of the polarization test work,and the second part is the model calculation of mixed alkali metal(rubidium-cesium)polarized xenon.In the first part of the study,based on the influence of various glass cavity materials on the polarization process,aluminosilicate(GE-180)glass was selected as the polarization cavity material,and the polarization cavity glass piping was designed,welded and fabricated,and based on the experimental requirements,~3He gas of not less than two standard air pressure densities was filled;the volume measurement and pressure calibration of the vacuum filling piping and the polarization cavity piping were carried out,and the final successful completion of the The hyperpolarized ~3He cavity was fabricated.The polarization of the developed cavity was tested,and the highest polarization of the high-pressure polarized ~3He cavity was measured to be47.6%,which reached the advanced level in China.The polarization degree of the cavity still has much room for improvement.Based on the advantages of some polarization parameters of alkali Cs compared with Rb,we have carried out theoretical calculations of Rb-Cs hybrid polarization,and found that the spin exchange rate of Xe polarized by alkali Cs is larger than that of Rb-Xe.The simulation is an attempt and breakthrough for the current domestic and foreign research on Rb-Cs mixed polarization,and the theoretical calculation results obtained fill the gap of domestic and foreign research on Rb-Cs mixed polarization,and also provide some reference value for the practical application of Rb-Cs mixed polarization.