Impact of the Tilted Detector Solenoid on the Ion Polarization at JLEIC∗

A. M. Kondratenko, M. A. Kondratenko, Yu N. Filatov, Ya S. Derbenev, F. Lin, V. S. Morozov, Y. Zhang

Research output: Contribution to journalConference articlepeer-review

Abstract

Jefferson Lab Electron Ion Collider (JLEIC) is a figure-8 collider "transparent" to the spin. This allows one to control the ion polarization using a universal 3D spin rotator based on weak solenoids. Besides the 3D spin rotator, a coherent effect on the spin is produced by a detector solenoid together with the dipole correctors and anti-solenoids compensating betatron oscillation coupling. The 4 m long detector solenoid is positioned along a straight section of the electron ring and makes a 50 mrad horizontal angle with a straight section of the ion ring. Such a large crossing angle is needed for a quick separation of the two colliding beams near the interaction point to make sufficient space for placement of interaction region magnets and to avoid parasitic collisions of shortly-spaced 476 MHz electron and ion bunches. We present a numerical analysis of the detector solenoid effect on the proton and deuteron polarizations. We demonstrate that the effect of the detector solenoid on the proton and deuteron polarizations can be compensated globally using an additional 3D rotator located anywhere in the ring.

Original languageEnglish
Article number012021
JournalJournal of Physics: Conference Series
Volume938
Issue number1
DOIs
StatePublished - Jan 5 2018
Externally publishedYes
Event17th Workshop on High Energy Spin Physics, DSPIN 2017 - RUS, Russian Federation
Duration: Sep 11 2017Sep 15 2017

Funding

* This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics under contracts DE-AC05-06OR23177 and DE-AC02-06CH11357.

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