PoS - Proceedings of Science
Volume 433 - 19th Workshop on Polarized Sources, Targets and Polarimetry (PSTP2022) - Session 14
The polarized deuteron target at COMPASS in 2022
N. Doshita*, Y. Ito, T. Iwata, H. Kohri†, K. Kondo, Y. Miyachi, G. Nukazuka, Y. Takanashi, W. Meyer, G. Reicherz, M. Finger, M. Pešek, N. Horikawa, H. Suzuki, J. Koivuniemi, C. Pires, T. Matsuda, S. Levorato and T. Trilok
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Pre-published on: March 26, 2023
Published on: August 04, 2023
The COMPASS experiment at CERN used a upgraded transversely polarized deuteron target with a muon beam of 160 GeV/c for SIDIS measurements in 2022. The deuteron target material of 6LiD installed in 3 cells was polarized by the DNP method with a 2.5 T magnet, a dilution refrig- erator and three 70 GHz microwave oscillators. During the data-taking the target operates in a transversely oriented magnetic dipole field at 0.6 T. This frozen spin operation mode without DNP process leads to a slow depolarization. Nevertheless, it was important to reach 40 % polarization that is sufficient for spin asymmetry measurement. The newly installed 3 microwave oscillators played a significant role to increase the polarization. We obtained deuteron polarizations of more than 40 % in each cell for two days. The relaxation time of the deuteron polarizations during the data taking period was measured to be about 5000 h at 0.6 T and below 100 mK.
DOI: https://doi.org/10.22323/1.433.0037
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