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A dielectric-loaded linac powered by THz-pulses is one of the key parts ofthe "Attosecond X-ray Science: Imaging and Spectroscopy" (AXSIS) project atDESY, Hamburg. As in conventional accelerators, the AXSIS linac is designed tohave phase velocity equal to the speed of light which, in this case, isrealized by tuning the thickness of the dielectric layer and the radius of thevacuum channel. Therefore, structure fabrication errors will lead to a changein the beam dynamics and beam quality. Additionally, errors in the bunchinjection will also affect the acceleration process and can cause beam loss onthe linac wall. This paper numerically investigates the process of electronbeam acceleration in the AXSIS linac, taking into account the aforementionederrors. Particle tracking simulations were done using the code ECHO, which usesa low-dispersive algorithm for the field calculation and was specially adaptedfor the dielectric-loaded accelerating structures.

Beam Dynamics and Tolerance Studies of the THz-driven Electron Linac for the AXSIS Experiment