PoS - Proceedings of Science
Volume 379 - The 18th International Workshop on Polarized Sources, Targets, and Polarimetry (PSTP2019) - Solid Polarized Targets
Polarized target at COMPASS
N. Doshita,* T. Iwata, K. Kondo, Y. Miyachi, G. Nukazuka, G. Reicherz, W. Meyer, M. Finger, M. Pesek, N. Horikawa, H. Suzuki, J.H. Koivuniemi, Y. Kisselev, S. Ishimoto, C. Pires, T. Matsuda
*corresponding author
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Published on: September 23, 2020
Abstract
The transversely polarized solid proton target was used in 2015 and 2018 for the polarized Drell- Yan experiment at the first in the world with a 10$^8$ /s intensity of 190 GeV pion beam at COM- PASS. Because of the radiation damage, the deterioration of the proton relaxation time of NH$_3$ was observed over more than 6 months data taking period. The radiation also affected the cryogenics control system in 2015. The radiation shield was improved and any incidents on the ra- diation was not observed in 2018. The transversely polarized deuteron target will be applied in 2021 with a muon beam of 160 GeV for Transversity and Sivers parton distribution functions measurements. A cooling test of the polarized target system will be performed in 2020.
DOI: https://doi.org/10.22323/1.379.0049
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