Drift- Chamber Gas System Controls Development for the
CEBAF Large Acceptance Spectrometer.*

M. F. Vineyard, T. J. Carroll, and M. N. Lack
Department of Physics. University of Richmond VA, 23173


A control system for the driftchamber gas system for the CEBAF Large Acceptance Spectrometer is being developed with EPICS. The system includes three RS- 232 instruments. The gas flow is controlled and monitored with the MKS 647A Multigas Controller. Pressures are measured with the MKS 146B Vacuum Gauge Measurement and Control System. The Panametrics Moisture Image Series 1 is used to monitor temperatures and the concentrations of oxygen, water, and ethane. Many parameters are also monitored with XYCOM XVME- 560 analog input cards. A discussion of the development of the RS- 232 device support software and the control system will be presented.

* Supported in part by the U.S. Department of Energy, Nuclear Physics Division, under contract DE- FG0588ER40459.