Download or read book Compensation for the Effect of Vacuum Chamber Eddy Current by Digital Signal Processing for Closed Orbit Feedback written by and published by . This book was released on 1993 with total page 3 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. The relatively thick (1/2 inch) aluminum storage ring vacuum chamber at corrector magnet locations for the local feedback systems will induce significant eddy current. This will reduce the correction bandwidth and could potentially destabilize the feedback systems. This paper describes measurement of the effect of the eddy current induced in the APS storage ring vacuum chamber by a horizontal/vertical corrector magnet and its compensation using digital signal processing at 4 kHz sampling frequency with proportional, integral, and derivative (PID) control algorithm for closed orbit feedback. A theory of digital feedback to obtain the linear system responses and the conditions for optimal control will also be presented. The magnet field in the vacuum chamber shows strong quadrupole and sextupole components varying with frequency, in addition to significant attenuation and phase shift with bandwidth ( -3 dB) of 20 Hz for horizontal and 4 Hz for vertical fields relative to the magnet current. Large changes in the magnet resistance and inductance were also observed, as the result of reduced total magnetic energy and increased Ohmic heat loss.
Download or read book Compensation for the Effect of Vacuum Chamber Eddy Current by Digital Signal Processing for Closed Orbit Feedback written by and published by . This book was released on 1993 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book European Particle Accelerator Conference Epac 94 In 3 Volumes written by Christine Petit-jean-genaz and published by World Scientific. This book was released on 1994-11-26 with total page 2968 pages. Available in PDF, EPUB and Kindle. Book excerpt: These proceedings aim to provide a comprehensive overview of research, technology and applications in the field of accelerators. Contributions from the entire field of accelerators are presented, including low and high energy machines, and medical and industrial accelerators.
Download or read book Synchrotron Radiation Sources A Primer written by Herman Winick and published by World Scientific. This book was released on 1995-02-28 with total page 529 pages. Available in PDF, EPUB and Kindle. Book excerpt: Specialists in the technical components of a synchrotron light source are usually well versed in their field and in the associated technical literature. However, with the rapid and continuing growth of synchrotron radiation research, and with new facilities coming online and being authorized for design and construction around the world, there is a need for a reference book that describes the various technical components of a synchrotron light source in a manner that will be useful to those who lack specialized technical background, but who have responsibility for some part of the design, construction, operation or development of such a facility. This would include technicians, engineers and physicists who have technical background in related fields but no specific experience with a synchrotron light source, and also project managers, laboratory directors, and government officials involved with synchrotron light facilities.College level scientific or engineering training or the equivalent experience is assumed and appropriate mathematics is used throughout. However, the basic concepts in each chapter are given in less technical language and a glossary of terms as well as an index will make the book useful for those with less technical training or experience.
Download or read book Effect of Vacuum Chamber Eddy Current and Compensation by Digital Feedback written by and published by . This book was released on 1992 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: Measurement of the effect of the eddy current induced in the APS storage ring vacuum chamber by the storage ring sextupole magnet and its compensation using digital feedback with proportional, integral, and derivative (PID) control algorithm are presented. The magnetic field in the vacuum chamber shows strong quadrupole and sextupole components varying with frequency, in addition to significant attenuation and phase shift. Large changes in the magnet resistance and inductance were also observed. Development of a theory of digital feedback to obtain system responses and the conditions for optimal control will be described, in conduction with design of a digital filter to compensate for the eddy current effect.
Download or read book Proceedings of the 1993 Particle Accelerator Conference written by and published by . This book was released on 1993 with total page 1080 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Energy Research Abstracts written by and published by . This book was released on 1993-10 with total page 578 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Open Loop Compensation for the Eddy Current Effect in the APS Storage Ring Vacuum Chamber written by and published by . This book was released on 1991 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the third generation synchrotron light sources, closed orbit stabilization against external vibrations is critical to ensure low emittance and high brightness. The Advanced Photon Source (APS) will use a large number (678) of correction magnets to create local bumps and to achieve global orbit stabilization. In this paper, we will present the result of the effort to counter the effect due to the finite inductance of the magnet and the eddy current in the 1/2 in.-thick aluminum storage ring vacuum chamber. The amplitude attenuation and the phase shift of the correction magnet field inside the APS storage ring vacuum chamber were measured. A circuit to compensate for this effect was then inserted between the signal source and the magnet power supply. The amplitude was restored with an error of less than 20% of the source signal amplitude and the phase shift was reduced from 80° to 12° at 10 Hz. Incorporation of this circuit in the closed loop feedback scheme and the resulting beneficial effect in the closed orbit stabilization will be discussed. 4 refs., 4 figs.
Download or read book Orbit Correction and Analysis in Circular Accelerators written by Eva S. Bozoki and published by AIP Conference Proceedings (Nu. This book was released on 1994 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt: Annotation Provides some approaches to keeping your electrons, protons, and heavy ions on track as they go around your accelerator. Eight invited presentations from a conference in Upton, New York, December 1993, are followed by 13 volunteer papers on orbit correction and analysis, stability, feedback, and coupling. No subject index. Reproduced from typescripts. Annotation c. by Book News, Inc., Portland, Or.
Download or read book Beam Instrumentation Workshop written by Robert E. Shafer and published by AIP Conference Proceedings (Nu. This book was released on 1994 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt: Annotation The 37 papers include discussions of signal generation in gas detectors, the status of fluorescent screens and image processing for the APS linac, and the measurement of multi-bunch transfer functions using time-domain data and Fourier analysis. Reproduced from typescripts. No subject index. Annotation c. by Book News, Inc., Portland, Or.
Download or read book Beam Instrumentation Workshop written by Robert E. Shafer and published by American Inst. of Physics. This book was released on 2000-04-14 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt: Annotation The 37 papers include discussions of signal generation in gas detectors, the status of fluorescent screens and image processing for the APS linac, and the measurement of multi-bunch transfer functions using time-domain data and Fourier analysis. Reproduced from typescripts. No subject index. Annotation c. by Book News, Inc., Portland, Or.
Download or read book INIS Atomindex written by and published by . This book was released on 1995 with total page 640 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proceedings of International Conference on Accelerators and Large Experimental Physics Control Systems written by Kō-enerugī Butsurigaku Kenkyūjo (Japan) and published by . This book was released on 1992 with total page 666 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Closed Orbit Feedback with Digital Signal Processing written by and published by . This book was released on 1994 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: The closed orbit feedback experiment conducted on the SPEAR using the singular value decomposition (SVD) technique and digital signal processing (DSP) is presented. The beam response matrix, defined as beam motion at beam position monitor (BPM) locations per unit kick by corrector magnets, was measured and then analyzed using SVD. Ten BPMs, sixteen correctors, and the eight largest SVD eigenvalues were used for closed orbit correction. The maximum sampling frequency for the closed loop feedback was measured at 37 Hz. Using the proportional and integral (PI) control algorithm with the gains Kp = 3 and K{sub I} = 0.05 and the open-loop bandwidth corresponding to 1% of the sampling frequency, a correction bandwidth ( -3 dB) of approximately 0.8 Hz was achieved. Time domain measurements showed that the response time of the closed loop feedback system for 1/e decay was approximately 0.25 second. This result implies (approximately) 100 Hz correction bandwidth for the planned beam position feedback system for the Advanced Photon Source storage ring with the projected 4-kHz sampling frequency.
Download or read book Open Loop Compensation for the Eddy Current Effect in the APS Storage Ring Vacuum Chamber written by and published by . This book was released on 1991 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Government Reports Announcements Index written by and published by . This book was released on 1996 with total page 818 pages. Available in PDF, EPUB and Kindle. Book excerpt:
