Self-amplified spontaneous emission free electron laser devices and nonidealudelectron beam transport

摘要

We have developed, at the SPARC test facility, a procedure for a real time self-amplified spontaneousudemission free electron laser (FEL) device performance control. We describe an actual FEL, includingudelectron and optical beam transport, through a set of analytical formulas, allowing a fast and reliable on-lineud“simulation” of the experiment. The system is designed in such a way that the characteristics of theudtransport elements and the laser intensity are measured and adjusted, via a real time computation, during theudexperimental run, to obtain an on-line feedback of the laser performances. The detail of the procedure andudthe relevant experimental results are discussed.