Current Status for Ion Polarization Studies

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Presentation transcript:

Current Status for Ion Polarization Studies Old contract with Kondratenko’s group ended on 6/15/17 All remaining milestones have been achieved Spin tracking simulations using verified existing codes Evaluation and compensation of the spin effect of the detector solenoid  Analysis of the betatron oscillation coupling effect on the polarization control scheme in the collider  Study of 1st-order effects of non-linear fields and higher-order spin resonances  Draft report available and being finalized Plan to present detailed results at the next R&D meeting

Future Plans A new contract has recently been signed for the period of 6/16/2017 – 6/15/2018 Deliverables 1st and 2nd quarters Evaluation of crab crossing effect on ion and electron polarizations Investigate implementation of the Spin Response Function method for suppression of depolarization in the interaction region including the beam-beam influence on the ion and electron spins Development of Spin Matching design for increasing electron polarization lifetime 3rd and 4th quarters Design and optimization of an electron spin rotator with vertical bends to improve ion polarization performance and reduce ion collider ring circumference by keeping the ion ring flat Continue Spin Matching design for increasing electron polarization lifetime Proof-of-principle simulations

Status of Electron Polarization Studies Spin tracking simulation using ZGOUBI is in progress. In addition to Anatoly Kondratenko’s help (proposed in FOA FY18) Prof. Klaus Heinemann from University of New Mexico (UNM) submitted a pre-application, titled “Numerical Optimization for Spin Dynamics in Electron (Positron)”, for the Accelerator Stewardship Award. Particularly, his work will focus on performing the technique of “spin matching” to improve the electron polarization lifetime in the JLEIC. Prof. David Sagan from Cornell University submitted a pre-application, titled “Optimization of the Spin Polarization Lifetime in Storage Rings”, for the Accelerator Stewardship Award. Particularly, his work will focus on extending the Bmad and PTC simulation toolkits to enable “spin matching” optimization simulations.