Abstracts |
S.Ramamoorthy, B.Kushner, B.Podobedov, Y.N.Tang, E.Zitvogel (BNL)
A fast digital feedback system has been installed in the UV ring at the National Synchrotron Light Source Facility and is in operation. A similar system is being developed for the X-ray ring. The micro subsystem is VME-based and uses fast ADC boards to sample the orbit. Corrections are computed and the resulting kick values are sent to the correctors (trim magnets) at 5 kHz through DACs. The system uses the standard real-time Control Monitor developed at NSLS and can accept commands from the high-level programs. However, during the feedback operations, there is minimal intervention from the rest of the control system. The system provides a bandwidth ~200 Hz(@DC gain 100) and reduces the vertical drift to a small fraction of the beam size. This paper focuses on the architecture of the system and the software strategies employed to achieve the 5 kHz rate. For diagnostic purposes, the software stores the orbit and kick values in the CPU memory in a ring Buffer. This data can be retrieved, analyzed and displayed in time and frequency domains.
{*} Work performed under the U.S. Department of Energy Contract No: DE-AC02-98CH10886
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C011127
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ICALEPCS 2001
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