The Development of the Polarized Target of COMPASS Spectrometer for the Measurement of Drell-Yan Reaction

为了揭示夸克-胶子角动量对核子自旋的贡献，我们在欧洲核子研究中心进行了Drell-yan实验的初步实验。初步实验由两部分组成。其一是检测束流加热对目标极化的影响。另一种方法是用π束流检查背景事件。这两个测试都确保了Drell-yan实验在不降低目标极化的情况下，使用较短的目标和强子吸收体的较短长度的背景较少。我们制作了将用于Drell-yan实验的靶架。看着这些初步结果，欧洲核子研究中心决定在2013-2015年间共享罗盘的测量时间，用于Drell-yan实验。

We performed the preliminary experiments at CERN for the Drell-Yan experiment to reveal the contribution of the quark-gluon angular momentum to the nucleon spin. The preliminary experiments consist of two parts. One is to check the decrease of the target polarization by heat caused by beam. Another is to check the background events using pion beam. Both tests assured the Drell-Yan experiment without decreasing the target polarization and with less background using the shorter length of the target and hadron absorber. We made the target holder which will be used for the Drell-Yan experiment. Looking those preliminary results, CERN decided to share the measuring time to COMPASS for Drell-Yan experiment during2013-2015.