Investigation of polarized proton target for high intensity hadron

欧洲核子研究中心的COMPASS合作项目有一个未来计划，即利用高强度强子束进行极化Drell-Yan实验，以研究核子自旋结构。研究了一种可用于强流强子束下的固体极化质子靶。通过优化抽运系统、优化微波功率和调整动态核极化所需的顺磁中心值等方法，使NH3靶材料达到了SMC实验中的最大极化，极化弛豫时间延长了10倍。

The COMPASS collaboration at CERN has a future program of polarized Drell-Yan experiment with a high intensity of hadron beam to study the nucleon spin structure. I investigated a solid polarized proton target, which can be used under the high intensity hadron beam. After some of tests, the NH3 target material reached the maximum polarization as much as in the SMC experiment and had a 10 times longer relaxation time of the polarization by the new pump system, by optimizing the microwave power and by adjusting the value of paramagnetic centers, which needs for dynamic nuclear polarization.