Linac Coherent Light Source (LCLS) Undulator Line Control System*
J.Z.Xu*, N.D.Arnold, R.Laird, S.E.Shoaf, S.J.Stein, W.E.Norum, X.S.Xu (ANL)
The 132-meter-long Linac Coherent Light Source (LCLS) undulator line consists of 33 identical undulator segments situated in a co-linear fashion. An EPICS-based turn-key control system has been designed and delivered to the LCLS project by the Advanced Photon Source (APS). The control system is responsible for a myriad of motion and feedback channels for each segment including two linear and five nonlinear motions with micron-level accuracy, numerous absolute position readbacks, and multiple temperature sensors. With the large distance covered in the undulator line tunnel, it was decided to distribute the controls duty to multiple instances of control hardware located at each segment within the tunnel itself. A detailed description of the control system and performance results is reported.
*Work at Argonne was supported by the U. S. Department of Energy, Office of Science, Office of Basic Energy Sciences under Contract No DE-AC02-06CH11357.