BFEL optical cavity's 5-D precise remote-control adjuster

The design of the BFEL optical cavity's 5-D precise remote-control adjuster is described. This paper discusses the special chracteristic of the FEL ca vity, and introduces how to inplement the transfer of the cavity's displace ment and angle adjusting inside and outside the vacuum chamber. This optica l cavity adjuster is designed with 3-level control precision, its displacem ent's adjustment range is +/- 5mm, the resolution is gum, the angle's adjus tment range is +/- 3 degrees and the resolution is 0.5". This control syste m has been used in BFEL's experiments.