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

Volume

3

fYear

2001

fDate

2001

Firstpage

2329

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 2001. PAC 2001. Proceedings of the 2001

Conference_Location

Chicago, IL

Print_ISBN

0-7803-7191-7

Type

conf

DOI

10.1109/PAC.2001.987368

Filename

987368