Speaker
Description
In 2018 the COMPASS experiment at CERN applied a transversely solid polarized proton target with a negative pion beam to measure the Sivers asymmetry using Drell-Yan process. The target system consists of a 50 mK dilution refrigerator, a 2.5 T solenoid magnet, two sets of 70 GHz microwave system. Solid NH
I will present the results of the proton polarization, the relaxation time during the data taking and the radiation damage of the target material.
In 2021 the experiment will exchange the NH
I will also present the status of the preparation.