Download or read book Transverse Feedback Systems for the PEP II B factory written by and published by . This book was released on 1995 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: Growth rates of coherent beam oscillations are faster than the natural damping mechanisms for the parameters of the PEP-II B-factory storage rings at nominal currents, even with damping of cavity higher order modes (HOM's). With 165 8 bunches separated by 4.2 ns, and a large current of up to 3A (2.14 A nominal in the low energy ring), many coupled-bunch modes are excited by the resistive wall impedance and cavity higher order mode impedance. Fastest growth times of transverse rigid-bunch modes of approximately 300 ps are expected, two orders of magnitude faster than the radiation damping time. We will provide broadband, bunch-by-bunch feedback to suppress this coherent motion of the beam. Experience gained with a prototype system, installed and successfully operating at the LBNL Advanced Light Source (ALS), has been used extensively in developing the design of the PEP-II systems.
Download or read book Feedback Systems for PEP II written by and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Feedback systems have been commissioned for the PEP-II B factory to control orbit drifts from thermal and other transients, and to optimize the transverse overlap of the stored beams at the interaction point. BPM-based feedback loops correct the orbit at several points around both the low- and the high-energy ring. The beams are kept centered in collision by an optimization feedback that dithers the transverse position of one of the beams at the interaction point to maximize the readout of a radiative-Bhabha luminosity monitor. Luminosity-optimization dithering is also used to stabilize the relative vertical angle of the two beams, and to keep the positron beam aimed at the luminosity monitor. The current implementation acts on the beams at a rate of up to 2 Hz, and can compensate for changes within 10 seconds or less. This paper outlines the implementation of the feedback loops, and highlights the main improvements inspired by the first year of physics running at PEP-II.
Download or read book PEP II Transverse Feedback Electronics Upgrade written by J. Weber and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The PEP-II B Factory at the Stanford Linear Accelerator Center (SLAC) requires an upgrade of the transverse feedback system electronics. The new electronics require 12-bit resolution and a minimum sampling rate of 238 Msps. A Field Programmable Gate Array (FPGA) is used to implement the feedback algorithm. The FPGA also contains an embedded PowerPC 405 (PPC-405) processor to run control system interface software for data retrieval, diagnostics, and system monitoring. The design of this system is based on the Xilinx(R) ML300 Development Platform, a circuit board set containing an FPGA with an embedded processor, a large memory bank, and other peripherals. This paper discusses the design of a digital feedback system based on an FPGA with an embedded processor. Discussion will include specifications, component selection, and integration with the ML300 design.
Download or read book PEP II Transverse Feedback Electronics Upgrade written by J. M. Weber and published by . This book was released on 2006 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt: The PEP-II B Factory at the Stanford Linear Accelerator Center (SLAC) requires an upgrade of the transverse feedback system electronics. The new electronics require 12-bit resolution and a minimum sampling rate of 238 Msps. A Field Programmable Gate Array (FPGA) is used to implement the feedback algorithm. The FPGA also contains an embedded PowerPC 405 (PPC-405) processor to run control system interface software for data retrieval, diagnostics, and system monitoring. The design of this system is based on the Xilinx{reg_sign} ML300 Development Platform, a circuit board set containing an FPGA with an embedded processor, a large memory bank, and other peripherals. This paper discusses the design of a digital feedback system based on an FPGA with an embedded processor. Discussion will include specifications, component selection, and integration with the ML300 design.
Download or read book B Physics Physics Beyond The Standard Model At The B Factory Proceedings Of The 1994 International Workshop written by S Suzuki and published by World Scientific. This book was released on 1995-07-14 with total page 494 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume reviews the recent progress of B physics, and discusses theoretical and experimental aspects of the physics which will be explored at the B factory. CP violation and new physics beyond the Standard Model are the main issues of the discussion.
Download or read book INITIAL COMMISSIONING RESULTS FROM THE PEP II TRANSVERSE COUPLED BUNCH FEEDBACK SYSTEMS written by and published by . This book was released on 2003 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt: Initial commissioning results from the PEP-II transverse coupled-bunch feedback systems are discussed. In particular, the performance of key hardware and coupled-bunch damping results are described in some detail. Beam dynamics related measurements presented include beam transfer functions and selected modal growth and damping rates.
Download or read book Feedback Implementation Options and Issues for B Factory Accelerators written by and published by . This book was released on 1992 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: The proposed B factory accelerator facilities will require active feedback systems to control multibunch instabilities. These feedback systems must operate in machines with thousands of circulating bunches and with short (2--4 ns) interbunch intervals. The functional requirements for transverse (betatron) and longitudinal (synchrotron) feedback systems are presented. Several possible implementation options are discussed and system requirements developed. Conceptual designs are presented for the PEP II transverse and longitudinal feedback systems.
Download or read book Damping Higher Order Modes in the PEP II B factory Storage Ring Collider written by Stephen Weathersby and published by . This book was released on 2007 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proceedings written by and published by . This book was released on 1995 with total page 788 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bunch by bunch Longitudinal Feedback System for PEP II written by and published by . This book was released on 1994 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper describes the implementation of the bunch-by-bunch longitudinal feedback system for the PEP-II B Factory. Bunch spacing down to 2 ns is achieved using 500 Megasamples per second A/D and D/A converters, and AT & T 1610 Digital Signal Processors are integrated to run a downsampled feedback algorithm for each bunch in parallel. This general purpose programmable system, packaged in VXI and VME, is modular and scalable to offer portability to other accelerator rings. The control and monitoring hardware and software architecture have been developed to provide ease of operation as well as diagnostic tools for machine physics.
Download or read book Supercolliders And Superdetectors Proceedings Of The 19th And 25th Workshops Of The Infn Eloisatron Project written by William A Barletta and published by World Scientific. This book was released on 1994-01-27 with total page 406 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume describes the critical issues involved in scaling the technology of proton synchrotrons to operate at energies much larger than those of existing accelerators. Luminosity limitions and interdependence of machine characteristics are analyzed. The second section presents analyses of the detector technologies needed to utilize a hadron super collider at the highest energies and luminosities.
Download or read book Proceedings of B Factories written by David Hitlin and published by . This book was released on 1992 with total page 688 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Frontiers of Particle Beams Factories with e e Rings written by M. Dienes and published by Springer. This book was released on 2014-04-24 with total page 422 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is presently the best available source on design and optimization of particle factories using e e - circular accelerators at the same time givingthe physical background for their construction. It addresses scientists and graduate students which is clearly reflected in its pedagogical style. The book aims at summarizing all the currently available knowledge on the motivation to construct particle factories, the design considerations of each of the different machine options including their lattices and interaction regions, practical details of the major systems constituting the machines, as well as a wide view of possible factories worldwide. It is the most up-to-date and unique collection of information of particle factories presently available.
Download or read book Energy Research Abstracts written by and published by . This book was released on 1995 with total page 782 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 Bunch by bunch Feedback for PEP II written by and published by . This book was released on 1993 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: The proposed PEP II B factory at SLAC requires a feedback to damp out longitudinal synchrotron oscillations. A time domain, downsampled, bunch-by-bunch feedback system in which each bunch is treated as an oscillator being driven by disturbances from other bunches is presented as we review the evolution of the system design. Results from a synchrotron oscillation damping experiment conducted at the SLAC/SSRL/SPEAR ring are also presented in this paper.
Download or read book Downsampled Bunch by bunch Feedback for PEP II written by and published by . This book was released on 1992 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: The PEP II B Factory requires a feedback system to damp out longitudinal synchrotron oscillations. A time-domain bunch-by-bunch feedback system has been proposed in which each bunch is treated as an oscillator being driven by disturbances from the other bunches. The phase is detected, filtered, and the feedback correction signal is applied by the kicker. Since we are damping energy oscillations using measurements of phase, the required feedback signal must be proportional to the amplitude of the phase oscillations but phase shifted by 90 degrees. This signal must be calculated for each of the 1658 bunches, in parallel. In the original proposal, it was estimated that a farm of approximately 480 digital signal processors (DIPS) would be required to implement the feedback system. However, using the technique of downsampling, this number can be reduced to about 50 DIPS. In what follows, we will briefly explain the basic idea of downsampling and its implementation.
