Polarized target at COMPASS

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 obse...

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Detalles Bibliográficos
Autores principales: Doshita, Norihiro, Iwata, Takahiro, Kondo, Kaori, Miyachi, Yoshiyuki, Nukazuka, Genki, Reicherz, Gerhard, Meyer, Werner, Finger, Miroslav, Pesek, Michael, Horikawa, Naoaki, Suzuki, Hajime, Koivuniemi, Jaakko Henrik, Kisselev, Yuri, Ishimoto, Shigeru, Pires, Christophe, Matsuda, Tatsuro
Lenguaje:eng
Publicado: SISSA 2020
Materias:
Accelerators and Storage Rings
Acceso en línea:https://dx.doi.org/10.22323/1.379.0049
http://cds.cern.ch/record/2799881
Descripción
Sumario: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.

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