LINAC2026 - 33rd Linear Accelerator Conference

Beam dynamics simulation and lattice optimization for the Siam Photon Source injector

Not scheduled

2h

Daejeon Convention Center

Poster Presentation MC1.A01: Beam Dynamics, beam simulations, beam transport Poster Session

Speaker

Dr Thakonwat Chanwattana (Synchrotron Light Research Institute)

Description

The Siam Photon Source (SPS) injector, comprising a pre-injector linac and a low-energy beam transport line (LBT), delivers a 40 MeV electron beam to a booster synchrotron for acceleration to 1.2 GeV. While this system has operated in its original configuration since commissioning, prior machine studies (in 2006 and 2016) revealed that overall beam transmission efficiency had degraded to below 30%. To address these losses without disrupting ongoing user beam services, start-to-end beam dynamics simulations were developed to serve as an optimization model. The model integrates space-charge tracking in the pre-injector (using ASTRA) with beam optics matching and multi-particle tracking through the LBT lattice (using ELEGANT). By benchmarking the simulated beam parameters against both the original conceptual design and recent measurements, several discrepancies were identified. This paper details the simulation methodology and proposes machine corrections—including the optimization of RF power and phase in the bunching components, and quadrupole tuning and polarity adjustments—to control the beam envelope and increase the transmission efficiency.