IPAC'24 - 15th International Particle Accelerator Conference

Comprehensive modeling of Siberian Snakes in BNL’s AGS: symplectic tracking and optical compensation

MOPS03

20 May 2024, 16:00

2h

Blues (MCC Exhibit Hall A)

Poster Presentation MC5.D03 Calculations of EM fields Theory and Code Developments Monday Poster Session

Speaker

Eiad Hamwi (Cornell University (CLASSE))

Description

Meaningful prediction and enhancement of spin-polarization in the RHIC/EIC accelerator complex relies on accurate modeling of each sub-component. Here we describe a symplectic field approximations of both Siberian Snakes in the AGS, enabling practical long-term tracking calculations. Without such symplectic representations, particle motion destabilizes very quickly close to injection energy. This optical instability manifests in $O({10}^3)$ turns, and makes dynamic aperture smaller than realistic emittances. Combined with optimization using the Bmad toolkit, we implement steering and optical corrections of the snake effects at 80 distinct energies from injection to extraction, mimicking the measured lattice conditions at each energy. This process unveils unforeseen snake distortions of the vertical dispersion near injection energy, which are addressed. By interpolating between such optimized lattice configurations, Bmad's tracking capabilities allow advanced simulation of polarization transmission through the full AGS cycle.

Funding Agency

Work supported by Brookhaven Science Associates, LLC under Contract No. DE-SC0012704 with the U.S. Department of Energy, No. DE SC-0024287, and DE-SC0018008.