User:Mzan71/sandbox

PADReS (Photon Analysis, Delivery and REduction System) is the system devoted to the transport and diagnostics of the photon beam delivered by the FERMI free electron laser (FEL) lightsource, located at Elettra Sincrotrone Trieste, Trieste (Italy). The group in charge of managing the system is called PADReS as well.

PADReS is located after the undulators of both FEL lines, and before the final five endstations in the FERMI experimental hall. It gives informations about several parameters like intensity, spectral distribution, position, wavefront, coherence. Some of them are resolved pulse by pulse and are obtained in a non-invasive way (intensity, spectral distribution, position), while others (coherence, for instance) can be measured only invasively. A gas absorber, moreover, gives the user the possibility to reduce the photon beam intensity by up to four orders of magnitude. PADReS includes also split-delay (AC/DC - AutoCorrelator Delay Creator) and focusing systems (including KAOS - Kirpatrick-Baez Active Optics System).