TY - JOUR

T1 - Free Spin Precession as an Alternative to the Resonant Depolarization Method in Future Electron-Positron Colliders

AU - Koop, I. A.

AU - Bedarev, E. V.

AU - Otboev, A. V.

AU - Shatunov, Yu M.

PY - 2024/6

Y1 - 2024/6

N2 - Abstract: In future electron-positron colliders, such as FC-ee and CEPC, it is planned to accurately measure the beam energy by resonance depolarization. In this paper, we propose an alternative approach based on the rapid resonant rotation of the spins into the horizontal plane of the ring and their subsequent free rotation around the equilibrium vertical direction. The frequency of free coherent spin precession is proposed to be measured by the beats of the number of scattering events of electrons interacting with circularly polarized laser light. Fourier analysis of the number of electrons dropped out of the ring aperture to determine the frequency of free precession. In this paper, spin dynamics is simulated at all stages of the process, taking into account synchrotron oscillations and energy diffusion, and statistical estimates of the accuracy of determining the frequency of spin precession for beam parameters in FCC-ee are made.

AB - Abstract: In future electron-positron colliders, such as FC-ee and CEPC, it is planned to accurately measure the beam energy by resonance depolarization. In this paper, we propose an alternative approach based on the rapid resonant rotation of the spins into the horizontal plane of the ring and their subsequent free rotation around the equilibrium vertical direction. The frequency of free coherent spin precession is proposed to be measured by the beats of the number of scattering events of electrons interacting with circularly polarized laser light. Fourier analysis of the number of electrons dropped out of the ring aperture to determine the frequency of free precession. In this paper, spin dynamics is simulated at all stages of the process, taking into account synchrotron oscillations and energy diffusion, and statistical estimates of the accuracy of determining the frequency of spin precession for beam parameters in FCC-ee are made.

UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85195654910&origin=inward&txGid=90de9af824c3bfa28717bff06a04bd9c

UR - https://www.mendeley.com/catalogue/9317444c-d022-3471-b23a-5a17c485c1a9/

U2 - 10.1134/S154747712470016X

DO - 10.1134/S154747712470016X

M3 - Article

VL - 21

SP - 305

EP - 309

JO - Physics of Particles and Nuclei Letters

JF - Physics of Particles and Nuclei Letters

SN - 1547-4771

IS - 3

ER -