A. M. Baldin specialized seminar

Relativistic nuclear physics and polarisation phenomena #803

Date and Time: Wednesday, 23 November 2022, at 11:00 AM

Venue: VBLHEP Conference Hall (building 215), the Veksler and Baldin Laboratory of High Energy Physics, online on Volna

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Seminar topic: “Proton polarization control in spin transparency mode of the NICA collider at integer spin resonances”

Speaker: Yu. N. Filatov

Abstract:

To fulfil the spin physics program at the NICA complex the unique method of controlling the lightest nuclei spin in the collider called the Spin Transparency mode (ST mode) is being developed at JINR. The ST mode allows one to provide the polarized proton beams with longitudinal and transverse polarization and to realize multiple spin flips with the spin reversal in less than one second. At the first stage the ST mode in the NICA collider with continuous scanning of proton beam momentum up to ~3.2 GeV/c will be provided by two solenoidal snakes based on four one-meter solenoids with a maximum field of 6 T which planned to be install in each collider ring. For protons with momenta greater than 3.2 GeV/c the ST mode can be organized only at the integer spin resonance which follow in energy steps of ~0.5 GeV.

The report presents a scheme to control the proton polarization at integer spin resonances. The spin orientation is controlled by a spin navigator which is realized using two weak solenoids with a maximum field integral of ~ 0.5 T m. The results of numerical simulations of adiabatic capture of polarization by the navigator when the proton beam approaches the region of integer spin resonance are presented. The results of calculations of spin dynamics at stabilization by the navigator of the longitudinal and radial proton beam polarization in the SPD detector at integer spin resonances taking into account synchrotron oscillations are presented.

(The work was performed according to the JINR-Science and Technique Laboratory “Zaryad” agreement)