Tuning machine parameters of particle accelerators is a repetitive and time-consuming task that challenging to automate. While many off-the-shelf optimization algorithms are available, in practice their use limited because most methods do not account for safety-critical constraints each iteration, such as loss signals or step-size limitations. One notable exception safe Bayesian optimization, w...

The cyclotron resonance laser (CRL) accelerator is a novel concept of accelerating continuous charged-particle beams to moderately or highly relativistic energies. This paper discusses prospects and limitations of this concept. In particular, the nonlinear coupling of an intense traveling electromagnetic wave with an electron beam in a guide magnetic field is studied, and the effects of wave di...