Beam Trajectory Correction for SNS

Automated beam trajectory correction with dipole correctors is developed and tested during the Spallation Neutron Source (SNS) warm linac commissioning periods. The application is based on the XAL Java framework with newly developed optimization tools. Also, dipole trajectory corrector polarities and strengths, and beam position monitor (BPM) polarities were checked by an orbit difference program. The online model is used in both the orbit difference and the trajectory correction applications. Experimental data for both applications will be presented.