Title :
A DSP-based beam current monitoring system for machine protection using adaptive filtering
Author :
Musson, J. ; Dong, H. ; Flood, R. ; Hovater, C. ; Hereford, J.
Author_Institution :
Thomas Jefferson Nat. Accelerator Facility, Newport News, VA, USA
Abstract :
The CEBAF accelerator at Jefferson Lab is currently using an analog beam current monitoring (BCM) system for its machine protection system (MPS), which has a loss accuracy of 2 μA. Recent burn-through simulations predict catastrophic beam line component failures below 1 μA of loss, resulting in a blind spot for the MPS. The revised MPS requirements target an ultimate beam loss accuracy of 250 nA. A new beam current monitoring system has been developed which utilizes modern digital receiver technology and digital signal processing concepts. The receiver employs a direct-digital down converter integrated circuit, mated with a Jefferson Lab digital signal processor VME card. Adaptive filtering is used to take advantage of current-dependent burn through rates. Benefits of such a system include elimination of DC offsets, generic algorithm development, extensive filter options, and interfaces to UNIX-based control systems
Keywords :
Unix; accelerator cavities; accelerator control systems; adaptive filters; digital integrated circuits; digital signal processing chips; electron accelerators; electron beams; high energy physics instrumentation computing; linear accelerators; nuclear electronics; particle beam diagnostics; particle beam stability; safety; signal processing; system buses; 1 muA; BCM; CEBAF accelerator; DC offset elimination; DSP-based beam current monitoring system; Jefferson Laboratory; UNIX-based control systems; VME card; adaptive filtering; beam cavity signal; burn-through simulations; catastrophic beam line component failures; digital receiver technology; digital signal processing; direct-digital down converter integrated circuit; extensive filter options; generic algorithm development; loss accuracy; machine protection system; ultimate beam loss accuracy; Adaptive filters; Condition monitoring; Digital integrated circuits; Digital signal processing; Digital signal processors; Integrated circuit technology; Particle beams; Predictive models; Protection; Signal processing algorithms;
Conference_Titel :
Particle Accelerator Conference, 2001. PAC 2001. Proceedings of the 2001
Conference_Location :
Chicago, IL
Print_ISBN :
0-7803-7191-7
DOI :
10.1109/PAC.2001.987368
