Lattice design and start-to-end simulations for the ARES linac

The SINBAD (Short INnovative Bunches and Accelerators at DESY) project is a dedicated, long-term accelerator research and development facility currently under construction at the DESY Hamburg campus, aiming to provide an infrastructure for developing ultrafast science and several types of novel high-gradient accelerators. We present the design of the magnetic lattice as well as the start-to-end simulation results for ultrashort electron bunch generation at the ARES (Accelerator Research Experiment at SINBAD) linac, which is one of the twoexperiments at the SINBAD facility. In order to meet the requirements for external injection into high-gradient accelerators, the ARES linac was optimized to provide ∼100 MeV, low charge (0.5 to 30 picocoulombs) and ultrashort electron bunches (sub-femtosecond to dozens of femtoseconds) with ultrasmall spot sizes (less than a few micrometers) and excellent timing stability (rms bunch arrival-time jitter