Low-energy high-brightness electron beam dynamics based on slice beam matrix method

摘要: Abstract Preserving the phase space quality has been of crucial importance to high-brightness electron beam transport. Any driving source performance limitations in such a transport system must be carefully examined order preserve quality. It is found that low energy, high bunch charge regime, effect on charged particle evolution can complicated. may insufficient analyze properties through envelope or lower moments for mere bulk beam. In this work we will study space-charge-dominated, low-energy, dynamics based slice matrix method. The method, extended from existing analysis, applicable an arbitrary longitudinal distribution and thus take nonlinear RF curvature into account. semi-analytical sliced model constructed assumes axisymmetric presence perfect conducting cylindrical pipe with circular cross section. We present paper theoretical formulation, starting single-particle dynamics, field calculation, followed by moment description collection particles, sigma decomposition. prove equivalence between method formalism effect, both transverse dimensions. Two examples are then demonstrated, one unit cell superconducting radio-frequency (RF) cavity other 1.5-cell gun system. results calculation discussed compared tracking simulation using ASTRA. expect analysis shall serve as efficient advanced tool further investigate low-energy dynamics.