Speaker
Description
Precise measurement and reconstruction of the beam sigma matrix is essential for accurate transport line modeling and injection optimization at modern accelerators. We demonstrate that the differentiable simulation framework Cheetah enables end-to-end gradient-based reconstruction of the 5×5 transverse sigma matrix (excluding the time coordinate) at the Booster-to-Storage Ring (BTS) transport line of the Advanced Photon Source (APS), using quadrupole scans and a downstream profile monitor. We present a generalized formulation that incorporates multi-screen measurements, enhancing the stability of the reconstruction in realistic lattice configurations. The differentiable tracking workflow provides physically consistent solutions while retaining computational scalability for routine use. These developments offer a scalable framework for sigma-matrix measurement in complex transport lines. They lay the foundation for future real-time model calibration and adaptive tuning during accelerator operation.
| Working group | WG5 |
|---|