Development of Polarized Internal Target

在一个极化目标的发展的第一阶段，我们将一个带有圆形极化激光束的蒸发碱金属进行极化。一个Pyrex玻璃的自旋交换细胞被包裹在一个从二氯-二甲基-硅烷的液体薄膜上，再加上水，使之远离极化。Rubidium原子在3，000高斯的磁场中被光学泵入，以减少氧化物线圈的辐射陷阱效应。Rubidium原子、Deuterium原子和Deuterons的极化需要对性能进行评估。我们构建了一个系统，以衡量使用法拉第旋转和评估它们在各种条件下的极化和气体厚度。系统可以在0.01的错误中决定旋转角度。A rotation angle of 0.56 degrees was observed for vacant threefold cells of total 1.4 cm thickness in 2 k gauss at the wavelengthy of 780.8 nm。Pyrex玻璃的Verdet常数是2*10^<-4> degrees/gauss·cm来自结果。对于Rubidium原子，我们的初步结果显示，在4*10^<13>原子/cm^2的气体密度上进行了0.4的极化。一个射频分离系统是为它而构建的。在一个质量光谱中，一个质量光谱仪测量了一个质量数的峰值，2个质量被观察到。这表明，分子在系统中被分离为原子。在短暂的时间后，峰值消失了，因为涂层被射频或激活的二元原子摧毁了。这是一个可以解决的问题之一，以解决polarized target的开发如何从这种破坏中受到保护。我们也正在开发一个Lamb-shift polarimeter来衡量Deuterium Nucleus （Deuteron）的极化化。

At the first stage of development of a polarized target, we polarized a vapored alkaline-metal with a circularly polarized laser beam. A spin-exchange cell of Pyrex glass was coated with a drifilm from dichloro-dimethyl-silane plus water to avoid depolarization. Rubidium atoms were optically-pumped in a magnetic field of 3,000 gauss in a solenoid coil to reduce the radiation trapping effect.Polarizations of rubidium atoms, deuterium atoms and deuterons are needed to be measured for assessment of the performance. We constructed a system to measure the polarization and gas-thickness using Faraday rotation and evaluated them under various conditions. The system can decide the rotation angle within an error of 0.01ﾟ. A rotation angle of 0.56 degrees was observed for vacant threefold cells of total 1.4 cm thickness in 2 k gauss at the wavelengthy of 780.8nm. The Verdet constant of Pyrex glass was obtained to be 2*10^<-4> degrees/gauss・cm from the result. For the rubidium atoms, our preliminary result showed a polarization of 0.4 at a gass thickness of 4*10^<13> atoms/cm^2.Deuterium molecules are dissociated into atoms at the first stage. An rf dissociation system was constructed for its sake. In a mass spectrum measured by a quadrupole mass spectrometer, a peak of a mass number of 2 was observed. It showed that the molecules were dissociated into atoms in the system. However the peak disappeared after a short time, because the coating was destroyed by rf or activated deuterium atoms. It is one of probelms to be solved for the development of the polarized target how the coating is protected from such a destruction.We are also developing a Lamb-shift polarimeter to measure the polarization of the deuterium nucleus (deuteron).