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Description
Intrabeam stripping (IBSt) is a critical beam-loss mechanism in high-intensity H- linacs and presents a significant limitation to increasing beam power. This work presents a computational framework to evaluate IBSt-induced beam losses along the Spallation Neutron Source (SNS) linac for arbitrary bunch distributions. The calculation is based on evaluating the IBSt loss integral using a probability density function (PDF) trained on discrete-particle bunch distribution with normalizing flows. The input distribution is transformed to scaled normal-form coordinates, which improved both normalizing-flow training and Monte Carlo (MC) sampling. The method is benchmarked against simplified analytically solvable Gaussian bunches and then applied to canonical-angular-momentum-dominated (CAM-dominated) beam distributions, which contain strong inter-plane correlations. We found that using CAM beams there is a reduction in the IBSt losses.