Speaker
Description
In many modern accelerators, intrabeam scattering (IBS) leads to measurable changes in a beam’s dimensions during operation. For a Gaussian beam, there are many well-known methods to calculate the growth rates. However, while growth rates are very useful, they generally do not provide insight into how IBS interacts with effects beyond linear dynamics. To avoid this limitation, we apply IBS kicks, with both damping and diffusion components, to macroparticles during element-by-element tracking. These kicks are derived from first principles and are chosen to give the same growth rates as traditional methods for a Gaussian beam, with no special form assumed for the covariance matrix of the distribution. The beam generally becomes non-Gaussian during tracking, but the kick is nevertheless approximated by that of a Gaussian beam with the same covariance matrix. This method of IBS simulation has been implemented in SciBmad, allowing for analysis of IBS effects in beams with nonlinear spin-orbit dynamics, synchrotron radiation, beam-beam interactions, and more. Furthermore, tracking with IBS kicks is parallelized on both the CPU and the GPU.
| Paper status | Resubmitted proceeding files received and assigned to an editor. Accepted. |
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