A Prototype Fast Feedback System for Energy Lock at CEBAF, 1995
Author: Mahesh Chowdhary
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Published: 1995
Total Pages:
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Author: Mahesh Chowdhary
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Published: 1995
Total Pages:
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Published: 1995
Total Pages: 4
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DOWNLOAD EBOOKThe beam energy at CEBAF must be controlled accurately against phase and gradient fluctuations in RF cavities in order to achieve a 2.5 x 10−5 relative energy spread. A prototype fast feedback system based on the concepts of Modern Control Theory has been implemented in the CEBAF control system to function as an energy lock. Measurements performed during the pulsed mode operations indicate presence of noise components at 4 Hz and 12 Hz on beam energy. This fast feedback prototype operates at 60 Hz rate and is integrated with EPICS. This paper describes the implementation of the fast feedback prototype, and operational experience with this system at CEBAF. 5 refs., 3 figs.
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Published: 1995
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DOWNLOAD EBOOKA 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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Published: 1996
Total Pages: 794
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DOWNLOAD EBOOKAuthor: C. Hill
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Published: 1996
Total Pages: 518
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DOWNLOAD EBOOKAuthor: Institute of Electrical and Electronics Engineers
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Published: 1996
Total Pages: 1208
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Author: Richard W. Dickson
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Published: 1999
Total Pages: 3
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DOWNLOAD EBOOKAuthor: Martin Comyn
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Published: 1998
Total Pages: 1382
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