Speaker
Description
Real-time characterization of the longitudinal phase-space distribution during beam transfer along the transfer channel into the SIS18 synchrotron (GSI Darmstadt, Germany) is essential for low-loss, high-intensity operation. The reconstruction problem is formulated as an optimization task: finding the phase-space distribution that best reproduces the observed beam profiles. Gradient-based optimization methods have proven effective for this purpose, but require a fully differentiable beam dynamics model. We consider space-charge forces of an elongating bunch, where effects of interaction with vacuum chamber depend on bunch length.
We present two approaches to incorporate space-charge interactions: a particle-particle space-charge solver based on Green's functions in cylindrical geometry, and an adaptive generalized g-factor model. Both models are differentiable and enable optimization of lattice parameters.
A reconstruction scheme using profile measurements at two positions along the transfer channel has been developed and tested on synthetic measurements with noise.