Fast Feedback System for CEBAF

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A fast feedback system based on concepts of modern control theory has been implemented in the CEBAF Control System to stabilize various machine parameters. The continuous wave operation of CEBAF requires that parameters such as beam energy and position are stabilized against fast fluctuations. The beam energy must be stabilized against fast gradient and phase fluctuations in the RF accelerating system. This fast feedback system currently operates at 60 Hz rate and is integrated with EPICS. The mathematical model of the system for various feedback loops is expressed in state space formalism. The design of control law and simulation of ... continued below

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680 Kilobytes pages

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Chowdhary, M.P.; Krafft, G.A.; Shoaee, H. & III, W.A. Watson October 1, 1995.

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Description

A fast feedback system based on concepts of modern control theory has been implemented in the CEBAF Control System to stabilize various machine parameters. The continuous wave operation of CEBAF requires that parameters such as beam energy and position are stabilized against fast fluctuations. The beam energy must be stabilized against fast gradient and phase fluctuations in the RF accelerating system. This fast feedback system currently operates at 60 Hz rate and is integrated with EPICS. The mathematical model of the system for various feedback loops is expressed in state space formalism. The design of control law and simulation of closed-loop system response is performed using MatlabTM and SimulinkTM. This paper describes the process of designing control algorithms, implementation of the fast feedback system and operational experience with this system at CEBAF. The performance of this feedback system, while operating at much higher rates with high closed loop gain, can be enhanced by continually performing on-line identification of the system from the input and output data. System identification is the process of developing or improving an analytically derived mathematical representation of a physical system using experimental data. The current status of this feature is presented.

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680 Kilobytes pages

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  • ICALEPCS 95, Chicago, IL (US), 10/29/1995--11/03/1995

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  • Report No.: JLAB-ACC-95-001
  • Report No.: DOE/ER/40150-1835
  • Grant Number: AC05-84ER40150
  • Office of Scientific & Technical Information Report Number: 777762
  • Archival Resource Key: ark:/67531/metadc716530

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • October 1, 1995

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  • Sept. 29, 2015, 5:31 a.m.

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  • Feb. 5, 2016, 9:32 p.m.

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Chowdhary, M.P.; Krafft, G.A.; Shoaee, H. & III, W.A. Watson. Fast Feedback System for CEBAF, article, October 1, 1995; Newport News, Virginia. (digital.library.unt.edu/ark:/67531/metadc716530/: accessed December 10, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.