Evaluation and Compensation of Detector Solenoid Effects in the JLEIC

Conference · Sun May 01 00:00:00 EDT 2016

OSTI ID:1331985

Wei, Guohui ^[1]; Morozov, Vasiliy ^[1]; Zhang, Yuhong ^[1]; Pilat, Fulvia C. ^[1]

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1. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

The JLEIC detector solenoid has a strong 3 T field in the IR area, and its tails extend over a range of several meters. One of the main effects of the solenoid field is coupling of the horizontal and vertical betatron motions which must be corrected in order to preserve the dynamical stability and beam spot size match at the IP. Additional effects include influence on the orbit and dispersion caused by the angle between the solenoid axis and the beam orbit. Meanwhile it affects ion polarization breaking the figure-8 spin symmetry. Crab dynamics further complicates the picture. All of these effects have to be compensated or accounted for. The proposed correction system is equivalent to the Rotating Frame Method. However, it does not involve physical rotation of elements. It provides local compensation of the solenoid effects independently for each side of the IR. It includes skew quadrupoles, dipole correctors and anti-solenoids to cancel perturbations to the orbit and linear optics. The skew quadrupoles and FFQ together generate an effect equivalent to adjustable rotation angle to do the decoupling task. Details of all of the correction systems are presented.

• Research Organization: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Nuclear Physics (NP)
• DOE Contract Number: AC05-06OR23177; AC02-06CH11357; AC02-76SF00515
• OSTI ID: 1331985
• Report Number(s): JLAB-ACP-16-2264; DOE/OR/23177-3988
• Resource Relation: Conference: IPAC'16, 08-13 May 2016
• Country of Publication: United States
• Language: English