The polarized deuteron target at COMPASS in 2022

被引：0

作者：

Doshita, N. ^{[1
]}

Ito, Y. ^{[1
]}

Iwata, T. ^{[1
]}

Kohri, H. ^{[1
]}

Kondo, K. ^{[1
]}

Miyachi, Y. ^{[1
]}

Nukazuka, G. ^{[1
]}

Takanashi, Y. ^{[1
]}

Meyer, W. ^{[2
]}

Reicherz, G. ^{[2
]}

Finger, M. ^{[3
]}

Pesek, M. ^{[3
]}

Horikawa, N. ^{[4
]}

Suzuki, H. ^{[4
]}

Koivuniemi, J. ^{[5
]}

Pires, C. ^{[6
]}

Matsuda, T. ^{[7
]}

Levorato, S. ^{[8
]}

Triloki, T. ^{[8
]}

机构：

[1] Yamagata Univ, Yamagata, Japan

[2] Ruhr Univ Bochum, Bochum, Germany

[3] Charles Univ Prague, Prague, Czech Republic

[4] Chubu Univ, Kasugai, Aichi, Japan

[5] Univ Illinois, Chicago, IL USA

[6] LIP, Lisbon, Portugal

[7] Univ Miyazaki, Miyazaki, Japan

[8] INFN Trieste, Trieste, Italy

来源：

19TH WORKSHOP ON POLARIZED SOURCES, TARGETS AND POLARIMETRY | 2023年

关键词：

D O I：

暂无

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

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 refrigerator 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.

引用

页数：5

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