Progress on the development of APS beam position monitoring system

The authors describe the development status of the beam position monitoring system for the Advanced Photon Source (APS). The accelerator complex will consist of an electron linac, a positron linac, a positron accumulator ring (PAR), an injector synchrotron, and a storage ring. For beam position measurement, striplines will be used on the injector synchrotron and the storage ring. A test stand with a prototype injector synchrotron beam position monitor (BPM) unit has been built, and the results of position calibration measurements using a wire are presented here. The results are compared with theoretical calculations. The current effort on similar storage ring BPM system measurements is also discussed. Calibration of the APS injector synchrotron BPM pickups is complete, and results agree well with theory.<>