Optical beamlines for the KEKB-factory synchrotron radiation monitors

We have designed and constructed two optical beamlines for the KEK B-factory synchrotron radiation monitors, one for each ring. Each beamline transports the SR beam 30-40 meters to an external optics hutch along two parallel paths. One path is used for direct imaging with adaptive optics, the other is used for transverse beam size measurements via SR interferometer and longitudinal profile measurements via streak camera. We designed and installed relay lens systems for the adaptive optics paths. We also provide remote alignment control for components which are inaccessible during beam operation (14 mirrors and 2 pairs of lenses total), with monitoring provided by a set of remote-controlled optical screen monitors. We describe the design of the relay lens and alignment systems along with performance results.