Acceleration of polarized protons and deuterons in the ion collider ring of JLEIC

8th International Particle Accelerator Conference

Kondratenko, A.M.^1 ; Kondratenko, M.A.^1 ; Filatov, Yu.N.^2 ; Derbenev, Ya.S.^1 ; Lin, F.^3 ; Morozov, V.S.^3 ; Zhang, Y.^3

Science and Technique Laboratory Zaryad, Novosibirsk, Russia^1

Moscow Institute of Physics and Technology, Dolgoprudny, Moscow Region, Russia^2

Jefferson Lab, Newport News

VA, United States^3

关键词: Beam polarization;    Collider rings;    Interference peaks;    Jefferson Lab;    Polarized protons;    Resonance strengths;    Spin resonance;    Transition energy;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/874/1/012011/pdf
DOI  :  10.1088/1742-6596/874/1/012011

来源: IOP

【 摘 要 】

The figure-8-shaped ion collider ring of Jefferson Lab Electron-Ion Collider (JLEIC) is transparent to the spin. It allows one to preserve proton and deuteron polarizations using weak stabilizing solenoids when accelerating the beam up to 100 GeV/c. When the stabilizing solenoids are introduced into the collider's lattice, the particle spins precess about a spin field, which consists of the field induced by the stabilizing solenoids and the zero-integer spin resonance strength. During acceleration of the beam, the induced spin field is maintained constant while the resonance strength experiences significant changes in the regions of "interference peaks". The beam polarization depends on the field ramp rate of the arc magnets. Its component along the spin field is preserved if acceleration is adiabatic. We present the results of our theoretical analysis and numerical modeling of the spin dynamics during acceleration of protons and deuterons in the JLEIC ion collider ring. We demonstrate high stability of the deuteron polarization in figure-8 accelerators. We analyze a change in the beam polarization when crossing the transition energy.