Experience with Commissioning of the LCLS Undulator System

by Heinz-Dieter Nuhn, SLAC / LCLS

Tuesday 15 Jun 2010, 14:30 → 15:30 Europe/Berlin

AER 19, R. 3.11 (European XFEL)

The LCLS x-ray FEL has achieved its 1.5-Angstrom lasing and saturation goals upon first trial. This was achieved with an extensive effort of pre-beam checkout, both traditional and beam-based component alignment techniques, and a high electron beam brightness. The very tight tolerances on the straightness of the electron beam trajectory (<5 µm) demanded by the x-ray FEL process have been met through a beam-based alignment (BBA) method, which is implemented using large electron energy variations and sub-micron cavity beam position monitors (BPM). Magnet damage is minimize by keeping radiation levels at very low levels through a complex interlock system (MPS). The talk will present some of the results of the undulator commissioning process.