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Development Of Digital Feedback Systems For Beam Position And Energy At The Thomas Jefferson National Accelerator Facility
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Book Synopsis Development of Digital Feedback Systems for Beam Position and Energy at the Thomas Jefferson National Accelerator Facility by :
Download or read book Development of Digital Feedback Systems for Beam Position and Energy at the Thomas Jefferson National Accelerator Facility written by and published by . This book was released on 1997 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: The development of beam-based digital feedback systems for the CEBAF accelerator has gone through several stages. As the accelerator moved from commissioning to operation for the nuclear physics program, the top priority was to stabilize the beam against slow energy and position drifts (
Book Synopsis Development of Digital Feedback Systems for Beam Position and Energy at the Thomas Jefferson National Accelerator Facility, May 1997 by : Jeff Karn
Download or read book Development of Digital Feedback Systems for Beam Position and Energy at the Thomas Jefferson National Accelerator Facility, May 1997 written by Jeff Karn and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Proceedings of the 1997 Particle Accelerator Conference by : Martin Comyn
Download or read book Proceedings of the 1997 Particle Accelerator Conference written by Martin Comyn and published by . This book was released on 1998 with total page 1382 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fast Feedback System for Energy and Beam Stabilization by :
Download or read book Fast Feedback System for Energy and Beam Stabilization written by and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The electron beams being delivered to targets of the Continuous Electron Beam Accelerator Facility (CEBAF) at Thomas Jefferson National Accelerator Facility (Jefferson Lab) are plagued with undesirable positional and energy fluctuations. These fluctuations primarily occur at harmonics of the power line frequency (60, 120, 180, etc. hertz), and their cause is rooted in electromagnetic fields generated by accelerator electronic equipment. It is possible to largely nullify these deviations by applying real time corrections to electromagnets and RF verniers along the beam line. This concept has been successfully applied at Jefferson Lab by extensively modifying the existing Beam Position Monitor (BPM) system with the integration of an algorithm that computes correction signals targeted at the power line harmonics. Many of the modifications required were due to the existing CEBAF BPM system not having the data acquisition bandwidth needed for this type of feedback system. This paper will describe the techniques required to transform the CEBAF standard BPM system into a high speed practical fast feedback system that coexists with the large scale control system--the Experimental Physics and Industrial Control System (EPICS)--that runs the CEBAF accelerator in daily operation.
Book Synopsis Fast Digital Feedback System for Energy and Beam Position Stabilization by : Valeri Lebedev
Download or read book Fast Digital Feedback System for Energy and Beam Position Stabilization written by Valeri Lebedev and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fast Feedback System for CEBAF. by :
Download or read book Fast Feedback System for CEBAF. written by and published by . This book was released on 1995 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Chemical Abstracts written by and published by . This book was released on 2002 with total page 2710 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Desideria Scholastica, oder, unvorgreifliche Gedanken über die gemeinesten Gebrechen der Lateinischen Schulen insgemein und derselben heilsame best-mögliche Abstellung by :
Download or read book Desideria Scholastica, oder, unvorgreifliche Gedanken über die gemeinesten Gebrechen der Lateinischen Schulen insgemein und derselben heilsame best-mögliche Abstellung written by and published by . This book was released on 1722 with total page 345 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Beam Dynamics Activities at the Thomas Jefferson National Accelerator Facility (Jefferson Lab). by :
Download or read book Beam Dynamics Activities at the Thomas Jefferson National Accelerator Facility (Jefferson Lab). written by and published by . This book was released on 1997 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Thomas Jefferson National Accelerator Facility (Jefferson Lab) has been funded by the US Navy to build an infra-red FEL driven by an energy-recovering compact SRF-based linear accelerator. The machine is to produce a 1 kW IR photon beam. The Jefferson Lab Accelerator Division is presently engaged in detailed design and beam dynamics studies for the driver accelerator. Principle beam dynamics and beam transport considerations include: (1) generation and transport of a high-quality, high-current, space-charge dominated beam; (2) the impact of coherent synchrotron radiation (CSR) during beam recirculation transport; (3) low-loss transport of a large momentum spread, high-current beam; (4) beam break up (BBU) instabilities in the recirculating accelerator; (5) impedance policing of transport system components; and (6) RF drive system control during energy recovery and FEL operation.
Book Synopsis A Distributed Feedback System for Rapid Stabilization of Arbitrary Process Variables by :
Download or read book A Distributed Feedback System for Rapid Stabilization of Arbitrary Process Variables written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In large process control systems it frequently becomes desirable to establish feedback relationships that were not anticipated during the design phase of the project. The ''Generic Lock'' architecture discussed in this paper makes it possible for system operators to implement new feedback loops between arbitrary process variables quickly and with no disturbance to the underlying control system. Any available process variables may be selected for the input and output of the loops so created, regardless of their physical or logical separation. The system allows multiple user interface points distributed through the control system while ensuring consistency among the feedback loops. This system can be used to quickly prototype and test new control philosophies or to control temporary hardware arrangements without any new software development. It is implemented at the Thomas Jefferson National Accelerator Facility using the Common Device (CDEV) framework on top of the Experimental Physics and Industrial Control System (EPICS). This paper discusses the architecture, implementation, and early usage of the system.
Book Synopsis Operational Experience with the CEBAF Control System by :
Download or read book Operational Experience with the CEBAF Control System written by and published by . This book was released on 1996 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: The CEBAF accelerator at Thomas Jefferson National Accelerator Facility (Jefferson Lab) successfully began its experimental nuclear physics program in November of 1995 and has since surpassed predicted machine availability. Part of this success can be attributed to using the EPICS (Experimental Physics and Industrial Control System) control system toolkit. The CEBAF control system is one of the largest accelerator control system now operating. It controls approximately 338 SRF cavities, 2,300 magnets, 500 beam position monitors and other accelerator devices, such as gun hardware and other beam monitoring devices. All told, the system must be able to access over 125,000 database records. The system has been well received by both operators and the hardware designers. The EPICS utilities have made the task of troubleshooting systems easier. The graphical and test-based creation tools have allowed operators to custom build control screens. In addition, the ability to integrate EPICS with other software packages, such as Tcl/Tk, has allowed physicists to quickly prototype high-level application programs, and to provide GUI front ends for command line driven tools. Specific examples of the control system applications are presented in the areas of energy and orbit control, cavity tuning and accelerator tune up diagnostics.
Book Synopsis Fast Digital Feedback System for Energy and Beam Position Stabilization by :
Download or read book Fast Digital Feedback System for Energy and Beam Position Stabilization written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A digital fast feedback system for beam energy and position stabilization at the target of the CEBAF accelerator is capable of suppressing beam motion in the frequency band from 0 to 80 Hz and also performs narrow band suppression at the first twelve power line harmonics. The system utilizes two VME computers and runs at a 2.4 kHz sampling rate. The numerical algorithm is based on a recursive digital filter with an additional feedforward loop for suppression of high power line harmonics. The system suppresses beam motion by a factor greater than ten, thus achieving the stabilization of relative beam energy fluctuations to better than 10[sup[minus]5] and stabilization of beam position on the target to better than 20[micro]m.
Book Synopsis On the Choice of Method to Cancel 60 Hz Disturbances in Beam Position and Energy by :
Download or read book On the Choice of Method to Cancel 60 Hz Disturbances in Beam Position and Energy written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Because the voltage applied to magnets in accelerators is likely to be rectified, there can be 60 Hz related fluctuations in beam position and energy. Correcting such errors as well as other less repeatable errors can be done with combinations of feedback, feedforward, real time repetitive control, and batch update repetitive control. This paper studies how to mix these approaches for optimized performance. It is shown that use of feedback control can be counterproductive because of the waterbed effect operating on errors such as BPM noise. Also, it is seen that iterative repetitive control updates can produce significantly better error levels than pure feedforward control. Making corrections of errors for harmonics of 60 Hz that are above the Nyquist frequency can be accomplished, and this can save the expense and integration effort to produce fast beam sampling.
Book Synopsis The Development and Implementation of a Beam Position Monitoring System for Use in the FONT Feedback System at ATF2 by : Robert Apsimon
Download or read book The Development and Implementation of a Beam Position Monitoring System for Use in the FONT Feedback System at ATF2 written by Robert Apsimon and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Feedback On Nanosecond Timescales (FONT) is a feedback system being developed to correct the beam position jitter in the extraction line and final focus system at the Accelerator Test Facility (ATF2), Tsukuba, Japan. FONT5 is currently being tested and is used to correct the intra-train jitter for a 3-bunch train; the bunch spacing is 154ns. This system measures the position of an electron bunch, using beam position monitors (BPMs). From this measurement, digital feedback electronics calculate the required correction, and sends a pulse to a feedback kicker. The feedback kicker then deflects the next bunch in the train in order to correct its position. Stripline BPMs are used at ATF2, and analogue processors manipulate the BPM signals before they are interpreted by the feedback electronics. The BPM system has been modelled and tested so that it can be parameterised and optimised. The BPMs are calibrated regularly, and the resolution of the system measured. Both of these properties have been analysed and modelled. This has allowed the resolution to be minimised. The resolution is an important factor which limits the achievable feedback correction. Several other factors have also been investigated; these include the feedback gain and the bunch-bunch correlation. To allow the feedback electronics to be controlled remotely, several data acquisition systems (DAQs) have been developed to allow data flow both to and from the digital board. The DAQs have been designed specifically for the firmware on the FONT digital board.
Book Synopsis Publicaciones del Instituto Geográfico Nacional by : Instituto Geográfico Nacional
Download or read book Publicaciones del Instituto Geográfico Nacional written by Instituto Geográfico Nacional and published by . This book was released on 1973 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Beam Position Feedback System for the Advanced Photon Source by :
Download or read book Beam Position Feedback System for the Advanced Photon Source written by and published by . This book was released on 1993 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Advanced Photon Source (APS) will implement both global and local beam position feedback systems to stabilize the particle and X-ray beams for the storage ring. The systems consist of 20 VME crates distributed around the ring, each running multiple digital signal processors (DSP) running at 4kHz sampling rate with a proportional, integral, and derivative (PID) control algorithm. The particle and X-ray beam position data is shared by the distributed processors through networked reflective memory. A theory of closed orbit correction using the technique of singular value decomposition (SVD) of the response matrix and simulation of its application to the APS storage ring will be discussed. This technique combines the global and local feedback systems and resolves the conflict among multiple local feedback systems due to local bump closure error. Maximum correction efficiency is achieved by feeding back the global orbit data to the local feedback systems. The effect of the eddy current induced in the relatively thick (1/2 inch) vacuum chamber by the AC corrector magnet field for local feedback systems is compensated by digital filters. Results of experiments conducted on the X-ray ring of the National Synchrotron Light Source and the SPEAR at Stanford Synchrotron Radiation Laboratory will also be presented.
Book Synopsis Electrical & Electronics Abstracts by :
Download or read book Electrical & Electronics Abstracts written by and published by . This book was released on 1997 with total page 2092 pages. Available in PDF, EPUB and Kindle. Book excerpt:
