Evaluation and compensation of detector solenoid effects in the JLEIC

G. H. Wei, V. S. Morozov, F. Lin, Y. Zhang, F. Pilat

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations

Abstract

The JLEIC detector solenoid has a strong 3 T field in the Interaction Region (IR) area with a big crossing angle of 50 mrad. 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 Interaction Point (IP). Additional effects include influence on the closed orbit and dispersion caused by the crossing angle between the solenoid axis and the ion beam orbit. Another important aspect of the solenoid is that 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 final focus quadrupoles together generate an effect equivalent to adjustable rotation angle to do the decoupling task. Details of all of the correction systems are presented.

Original languageEnglish
Title of host publicationIPAC 2016 - Proceedings of the 7th International Particle Accelerator Conference
PublisherJoint Accelerator Conferences Website (JACoW)
Pages2454-2456
Number of pages3
ISBN (Electronic)9783954501472
StatePublished - 2016
Externally publishedYes
Event7th International Particle Accelerator Conference, IPAC 2016 - Busan, Korea, Republic of
Duration: May 8 2016May 13 2016

Publication series

NameIPAC 2016 - Proceedings of the 7th International Particle Accelerator Conference

Conference

Conference7th International Particle Accelerator Conference, IPAC 2016
Country/TerritoryKorea, Republic of
CityBusan
Period05/8/1605/13/16

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