Proton Spin Tracking with Symplectic Integration of Orbit Motion

Symplectic integration for orbital motion had been adopted in SimTrack which has been extensively used for dynamic aperture calculation with beam-beam interaction for the Relativistic Heavy Ion Collider (RHIC). Recently spin tracking for protons has been implemented on top of the orbit motion in this code. In this article, we will explain the implementation of spin motion using Thomas-BMT equation, and benchmark with other spin tracking codes currently used for RHIC. Possibility and remedy for very-long term particle tracking, such as on the RHIC energy acceleration, is also explored.
Proceedings of the 6th Int. Particle Accelerator Conf., IPAC2015, Richmond, VA, USA