Paper  Title  Page 

MOPWO066  GPUaccelerated Spin Dynamics and Analysis for RHIC  1037 


Funding: This work supported in part by the US DOE Office No. DESC0004432. Graphics processing units (GPUs) have now become powerful tools for scientific computation. Here we present our work on using GPUs (singly or in parallel) to speed the tracking of both orbital and spin degrees of freedom in particle accelerators. This work includes the development of new spin integrators that are both fast and accurate. We have also developed an integrated set of tools for analysing the results. To demonstrate the utility of these new tools, we use them to study the spin dynamics of protons in the Relativistic Heavy Ion Collider at Brookhaven National Lab. 

MOPWO070  Higher Order Symplectic Integration of Collective Effects  1046 


Long time tracking simulations of intense beams requires a proper account for the collective effects. Many tracking codes allow the number of space charge kicks, for example, to be determined by the end user. This makes no guarantee that the integration is second order accurate in the step size. In this proceeding, we present results on the proper second and fourthorder symplectic integration of the Hamiltonian dynamics of particles under collective interactions using a model Hamiltonian with collective space charge forces to illustrate the underlying principles.  
THYB101  Suppressing Transverse Beam Halo with Nonlinear Magnetic Fields  3099 


Funding: This work was supported in part by the US Department of Energy's Office of Science, Office of High Energy Physics, under grant No. DESC0006247. Traditional space charge driven resonances, such as beam halo, arise due to the underlying linear nature of accelerator lattices. In this talk, we present initial results on a new class of intrinsically nonlinear lattices, which introduce a large tune spread naturally. The resulting nonlinear decoherence suppresses the onset of beam halo. 

Slides THYB101 [63.510 MB]  