Fast Beam Based Bpm Calibration

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Fast Beam-Based BPM Calibration

Author :
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ISBN 13 :
Total Pages : 3 pages
Book Rating : 4.:/5 (16 download)

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Download or read book Fast Beam-Based BPM Calibration written by and published by . This book was released on 2012 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Alignment Diagnostic System (ADS) of the LCLS undulator system indicates that the 33 undulator quadrupoles have extremely high position stability over many weeks. However, beam trajectory straightness and lasing efficiency degrade more quickly than this. A lengthy Beam Based Alignment (BBA) procedure must be executed every two to four weeks to re-optimize the X-ray beam parameters. The undulator system includes RF cavity Beam Position Monitors (RFBPMs), several of which are utilized by an automatic feedback system to align the incoming electron-beam trajectory to the undulator axis. The beam trajectory straightness degradation has been traced to electronic drifts of the gain and offset of the BPMs used in the beam feedback system. To quickly recover the trajectory straightness, we have developed a fast beam-based procedure to recalibrate the BPMs. This procedure takes advantage of the high-precision monitoring capability of the ADS, which allows highly repeatable positioning of undulator quadrupoles. This report describes the ADS, the position stability of the LCLS undulator quadrupoles, and some results of the new recovery procedure.

Beam-based Calibrations of the BPM Offset at C-ADS Injector II*Supported by National Natural Science Foundation of China (91426303, 11525523).

Download Beam-based Calibrations of the BPM Offset at C-ADS Injector II*Supported by National Natural Science Foundation of China (91426303, 11525523). PDF Online Free

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ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (15 download)

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Book Synopsis Beam-based Calibrations of the BPM Offset at C-ADS Injector II*Supported by National Natural Science Foundation of China (91426303, 11525523). by :

Download or read book Beam-based Calibrations of the BPM Offset at C-ADS Injector II*Supported by National Natural Science Foundation of China (91426303, 11525523). written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: Beam-based BPM offset calibration was carried out for Injector II at the C-ADS demonstration facility at the Institute of Modern Physics (IMP), Chinese Academy of Science (CAS). By using the steering coils integrated in the quadrupoles, the beam orbit can be effectively adjusted and BPM positions recorded at the Medium Energy Beam Transport of the Injector II Linac. The studies were done with a 2 mA, 2.1 MeV proton beam in pulsed mode. During the studies, the "null comparison method" was applied for the calibration. This method is less sensitive to errors compared with the traditional transmission matrix method. In addition, the quadrupole magnet's center can also be calibrated with this method.

Beam-based Correction and Optimization for Accelerators

Author : Xiaobiao Huang
Publisher : CRC Press
ISBN 13 : 0429784732
Total Pages : 196 pages
Book Rating : 4.4/5 (297 download)

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Book Synopsis Beam-based Correction and Optimization for Accelerators by : Xiaobiao Huang

Download or read book Beam-based Correction and Optimization for Accelerators written by Xiaobiao Huang and published by CRC Press. This book was released on 2019-12-05 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides systematic coverage of the beam-based techniques that accelerator physicists use to improve the performance of large particle accelerators, including synchrotrons and linacs. It begins by discussing the basic principles of accelerators, before exploring the various error sources in accelerators and their impact on the machine's performances. The book then demonstrates the latest developments of beam-based correction techniques that can be used to address such errors and covers the new and expanding area of beam-based optimization. This book is an ideal, accessible reference book for physicists working on accelerator design and operation, and for postgraduate studying accelerator physics. Features: Entirely self-contained, exploring the theoretic background, including algorithm descriptions, and providing application guidance Accompanied by source codes of the main algorithms and sample codes online Uses real-life accelerator problems to illustrate principles, enabling readers to apply techniques to their own problems Xiaobiao Huang is an accelerator physicist at the SLAC National Accelerator Laboratory at Stanford University, USA. He graduated from Tsinghua University with a Bachelor of Science in Physics and a Bachelor of Engineering in Computer Science in 1999. He earned a PhD in Accelerator Physics from Indiana University, Bloomington, Indiana, USA, in 2005. He spent three years on thesis research work at Fermi National Accelerator Laboratory from 2003-2005. He has worked at SLAC as a staff scientist since 2006. He became Accelerator Physics Group Leader of the SPEAR3 Division, Accelerator Directorate in 2015. His research work in accelerator physics ranges from beam dynamics, accelerator design, and accelerator modelling and simulation to beam based measurements, accelerator control, and accelerator optimization. He has taught several courses at US Particle Accelerator School (USPAS), including Beam Based Diagnostics, Accelerator Physics, Advanced Accelerator Physics, and Special Topics in Accelerator Physics.

Sensitivity and Offset Calibration for the Beam Position Monitors at the Advanced Photon Source

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Publisher :
ISBN 13 :
Total Pages : 4 pages
Book Rating : 4.:/5 (871 download)

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Book Synopsis Sensitivity and Offset Calibration for the Beam Position Monitors at the Advanced Photon Source by :

Download or read book Sensitivity and Offset Calibration for the Beam Position Monitors at the Advanced Photon Source written by and published by . This book was released on 1995 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: The beam position monitors (BPMs) play a critically important role in commissioning and operation of accelerators. Accurate determination of the offsets relative to the magnetic axis and sensitivities of individual BPMs is thus needed. We will describe in this paper the schemes for calibrating all of the 360 BPMs for sensitivity and offset in the 7-GeV Advanced Photon Source (APS) storage ring and the results. For the sensitivity calibration, a 2-dimensional map of the BPM response in the aluminum vacuum chamber is obtained theoretically, which is combined with the measured nonlinear response of the BPM electronics. A set of 2-dimensional polynomial coefficients is then obtained to approximate the result analytically. The offset calibration of the BPMs is done relative to the magnetic axis of the quadrupoles using the beam. This avoids the problem arising from various mechanical sources as well as the offset in the processing electronics. The measurement results for the resolution and long-term drift of the BPM electronics shows 0.06-[mu]m/√Hz resolution and 2-[mu]m/hr drift over a period of 1.5 hrs.

Frontier Computing

Author : Jason C. Hung
Publisher : Springer
ISBN 13 : 9811336482
Total Pages : 2003 pages
Book Rating : 4.8/5 (113 download)

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Book Synopsis Frontier Computing by : Jason C. Hung

Download or read book Frontier Computing written by Jason C. Hung and published by Springer. This book was released on 2019-05-18 with total page 2003 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the proceedings of the 6th International Conference on Frontier Computing, held in Kuala Lumpur, Malaysia on July 3–6, 2018, and provides comprehensive coverage of the latest advances and trends in information technology, science and engineering. It addresses a number of broad themes, including communication networks, business intelligence and knowledge management, web intelligence, and related fields that inspire the development of information technology. The contributions cover a wide range of topics: database and data mining, networking and communications, web and internet of things, embedded systems, soft computing, social network analysis, security and privacy, optical communication, and ubiquitous/pervasive computing. Many of the papers outline promising future research directions. The book is a valuable resource for students, researchers and professionals, and also offers a useful reference guide for newcomers to the field.

Beam Position Monitor Calibration for the Advanced Photon Source

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ISBN 13 :
Total Pages : 3 pages
Book Rating : 4.:/5 (16 download)

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Book Synopsis Beam Position Monitor Calibration for the Advanced Photon Source by :

Download or read book Beam Position Monitor Calibration for the Advanced Photon Source written by and published by . This book was released on 1993 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper describes the sensitivity and offset calibration for the beam position monitors (BPMs) using button-type pickups in the injector synchrotron, storage ring, and insertion devices of the Advanced Photon Source (APS). In order to reduce the overall offset and to isolate the error (r"100?m) due to the low fabrication tolerance in the extruded storage ring vacuum chamber, the electrical offset is minimized by carefully sorting and matching the buttons and cables according to the button capacitance and the characteristic impedances of the cable and the button feedthrough. The wire method is used for the sensitivity calibration, position-to-signal mapping, and measurement of resolution and long-term drift (r"1 mV) of the processing electronics. The processing electrons was also tested at Stanford Synchrotron Radiation Laboratory (SSRL) using a real beam, with results indicating better than 25?m resolution for the APS storage ring. Conversion between the BPM signal and the actual beam position is done by using polynomial expansions fit to the mapping data with absolute accuracy better than 25?m within ±5 mm square. Measurement of the effect of button mispositioning and mechanical inaccuracy of the extruded storage ring vacuum chamber, including deformation under vacuum, will be also discussed.

Beam Instrumentation Workshop

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Publisher :
ISBN 13 :
Total Pages : 654 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Beam Instrumentation Workshop by :

Download or read book Beam Instrumentation Workshop written by and published by . This book was released on 1998 with total page 654 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Precise and Fast Beam Energy Measurement

Author : Michele Viti
Publisher : Sudwestdeutscher Verlag Fur Hochschulschriften AG
ISBN 13 : 9783838117416
Total Pages : 156 pages
Book Rating : 4.1/5 (174 download)

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Book Synopsis Precise and Fast Beam Energy Measurement by : Michele Viti

Download or read book Precise and Fast Beam Energy Measurement written by Michele Viti and published by Sudwestdeutscher Verlag Fur Hochschulschriften AG. This book was released on 2010-06 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt: For the physics program at the International Linear Collider (ILC), an excellent bunch-by-bunch control of the beam energy is mandatory. Energy spectrometers upstream and downstream of the electron/positron interaction point were proposed and the present default option for the upstream spectrometer is a beam position monitor based (BPM-based) spectrometer. In 2006/2007, a prototype of such a device was commissioned at the End Station A beam line at the Stanford Linear Accelerator Center (SLAC) in order to study performance and reliability. In addition, a novel method based on laser Compton backscattering has been proposed, since as proved at the Large Electron-Positron Collider (LEP) and the Stanford Linear Collider (SLC), complementary methods are necessary to cross-check the results of the BPM-based spectrometer. In this thesis, an overview of the experiment at End Station A is given, with emphasis on the performance of the magnets in the chicane and first energy resolution estimations. Also, the novel Compton backscattering method is discussed in details and found to be very promising. It has the potential to bring the beam energy resolution well below the requirement.

PA1317(L13)

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ISBN 13 :
Total Pages : 5 pages
Book Rating : 4.:/5 (873 download)

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Download or read book PA1317(L13) written by and published by . This book was released on 1993 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this program is to determine the centers of the high-energy linac (HEL) BPMs using beam information, and to compare this information with the existing surveying information. It measures directly and quantitatively the amount of quad steering in each of the HEL quads. It is hoped that this program is all that is needed to make this measurement This procedure is based on the observation of the beam position in a BPM downstream of a quad while changing the magnetic field in that quad. If the beam is centered in the quad, then this change will have no effect on the trajectory of the beam. However, if the beam is off center at the quad, changing the field will steer the beam. This measurement therefore can be used to measure the position of the beam in the quad under examination.

Handbook of Accelerator Physics and Engineering

Author : Alexander Wu Chao
Publisher : World Scientific
ISBN 13 : 9814415855
Total Pages : 849 pages
Book Rating : 4.8/5 (144 download)

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Book Synopsis Handbook of Accelerator Physics and Engineering by : Alexander Wu Chao

Download or read book Handbook of Accelerator Physics and Engineering written by Alexander Wu Chao and published by World Scientific. This book was released on 2013 with total page 849 pages. Available in PDF, EPUB and Kindle. Book excerpt: Edited by internationally recognized authorities in the field, this expanded and updated new edition of the bestselling Handbook, containing more than 100 new articles, is aimed at the design and operation of modern particle accelerators. It is intended as a vade mecum for professional engineers and physicists engaged in these subjects. With a collection of more than 2000 equations, 300 illustrations and 500 graphs and tables, here one will find, in addition to the common formulae of previous compilations, hard-to-find, specialized formulae, recipes and material data pooled from the lifetime experience of many of the world''s most able practitioners of the art and science of accelerators.The eight chapters include both theoretical and practical matters as well as an extensive glossary of accelerator types. Chapters on beam dynamics and electromagnetic and nuclear interactions deal with linear and nonlinear single particle and collective effects including spin motion, beam-environment, beam-beam, beam-electron, beam-ion and intrabeam interactions. The impedance concept and related calculations are dealt with at length as are the instabilities associated with the various interactions mentioned. A chapter on operational considerations includes discussions on the assessment and correction of orbit and optics errors, real-time feedbacks, generation of short photon pulses, bunch compression, tuning of normal and superconducting linacs, energy recovery linacs, free electron lasers, cooling, space-charge compensation, brightness of light sources, collider luminosity optimization and collision schemes. Chapters on mechanical and electrical considerations present material data and important aspects of component design including heat transfer and refrigeration. Hardware systems for particle sources, feedback systems, confinement and acceleration (both normal conducting and superconducting) receive detailed treatment in a subsystems chapter, beam measurement techniques and apparatus being treated therein as well. The closing chapter gives data and methods for radiation protection computations as well as much data on radiation damage to various materials and devices.A detailed name and subject index is provided together with reliable references to the literature where the most detailed information available on all subjects treated can be found.

UPGRADE TO INITIAL BPM ELECTRONICS MODULE AND BEAMLINE COMPONENTS FOR CALIBRATION OF THE LEDA BEAM POSITION MEASUREMENTS.

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Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (684 download)

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Book Synopsis UPGRADE TO INITIAL BPM ELECTRONICS MODULE AND BEAMLINE COMPONENTS FOR CALIBRATION OF THE LEDA BEAM POSITION MEASUREMENTS. by :

Download or read book UPGRADE TO INITIAL BPM ELECTRONICS MODULE AND BEAMLINE COMPONENTS FOR CALIBRATION OF THE LEDA BEAM POSITION MEASUREMENTS. written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The Low-Energy Demonstration Accelerator (LEDA), designed and built at the Los Alamos National Laboratory, is part of the Accelerator Production of Tritium (APT) program and provides a platform for measuring high-power proton beam-halo formation. Beam Position Monitors (BPMs) are placed along the FODO lattice and the HEBT. The BPM systems employing log-ratio processor electronics have recently been upgraded for all fifteen BPMs along the accelerator. Two types of calibration are now used. The first corrects for errors within the electronics module and the log-amp transfer function non-conformity. The second is a single-point routine used to correct for cable plant attenuation differences. This paper will also cover the new switching systems used for various system calibration modes as well as various results from LEDA beam runs. New switching algorithms were implemented in order to remove sensitive electronic switches from within the beam tunnel radiation environment. Attention will be paid to the calibration algorithms and switching system interactions, and how well they work in practice.

Lattice Calibration with Turn-By-Turn BPM Data

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Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (16 download)

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Book Synopsis Lattice Calibration with Turn-By-Turn BPM Data by :

Download or read book Lattice Calibration with Turn-By-Turn BPM Data written by and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Turn-by-turn beam position monitor (BPM) data from multiple BPMs are fitted with a tracking code to calibrate magnet strengths in a manner similar to the well known LOCO code. Simulation shows that this turn-by-turn method can be a quick and efficient way for optics calibration. The method is applicable to both linacs and ring accelerators. Experimental results for a section of the SPEAR3 ring is also shown.

Modeling, Programming and Simulations Using LabVIEWTM Software

Author : Riccardo de Asmundis
Publisher : BoD – Books on Demand
ISBN 13 : 953307521X
Total Pages : 322 pages
Book Rating : 4.5/5 (33 download)

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Book Synopsis Modeling, Programming and Simulations Using LabVIEWTM Software by : Riccardo de Asmundis

Download or read book Modeling, Programming and Simulations Using LabVIEWTM Software written by Riccardo de Asmundis and published by BoD – Books on Demand. This book was released on 2011-01-21 with total page 322 pages. Available in PDF, EPUB and Kindle. Book excerpt: Born originally as a software for instrumentation control, LabVIEW became quickly a very powerful programming language, having some peculiar characteristics which made it unique: the simplicity in creating very effective Users Interfaces and the G programming mode. While the former allows designing very professional controls panels and whole Applications, completed with features for distributing and installing them, the latter represents an innovative and enthusiastic way of programming: the Graphical representation of the code. The surprising aspect is that such a way of conceiving algorithms is absolutely similar to the SADT method (Structured Analysis and Design Technique) introduced by Douglas T. Ross and SofTech, Inc. (USA) in 1969 from an original idea of MIT, and extensively used by US Air Force for their projects. LabVIEW practically allows programming by implementing straightly the equivalent of an SADT "actigram". Beside this academical aspect, LabVIEW can be used in a variety of forms, creating projects that can spread over an enormous field of applications: from control and monitor software to data treatment and archiving; from modeling to instruments controls; from real time programming to advanced analysis tools with very powerful mathematical algorithms ready to use; from full integration with native hardware (by National Instruments) to an easy implementation of drivers for third party hardware. In this book a collection of different applications which cover a wide range of possibilities is presented. We go from simple or distributed control software to modeling done in LabVIEW; from very specific applications to usage in the educational environment.

Automatic Beamline Calibration Procedures

Author :
Publisher :
ISBN 13 :
Total Pages : 3 pages
Book Rating : 4.:/5 (727 download)

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Book Synopsis Automatic Beamline Calibration Procedures by :

Download or read book Automatic Beamline Calibration Procedures written by and published by . This book was released on 1992 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent experience with the SLC and SPEAR accelerators have led to a well-defined set of procedures for calibration of the beamline model using the orbit fitting program, RESOLVE. Difference orbit analysis is used to calibrate quadrupole strengths, BPM sensitivities, corrector strengths, focusing effects from insertion devices, and to determine the source of dispersion and coupling errors. Absolute orbit analysis is used to locate quadrupole misalignments, BPM offsets, or beam loss. For light source applications, the photon beam source coordinates can be found. The result is an accurate model of the accelerator which can be used for machine control. In this paper, automatable beamline calibration procedures are outlined and illustrated with recent examples. 5 refs.

Performance of a Nanometer Resolution BPM System

Author : D. Miller
Publisher :
ISBN 13 :
Total Pages : 24 pages
Book Rating : 4.:/5 (316 download)

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Book Synopsis Performance of a Nanometer Resolution BPM System by : D. Miller

Download or read book Performance of a Nanometer Resolution BPM System written by D. Miller and published by . This book was released on 2005 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: International Linear Collider (ILC) interaction region beam sizes and component position stability requirements will be as small as a few nanometers. it is important to the ongoing ILC design effort to demonstrate that these tolerances can be achieved--ideally using beam-based stability measurements. It has been estimated that an RF cavity BPM with modern waveform processing could provide a position measurement resolution of less than one nanometer. Such a system could form the basis of the desired beam-based stability measurement, as well as be used for other specialized purposes. They have developed a high resolution RF cavity BPM and associated electronics. A triplet comprised of these BPMs has been installed in the extraction line of the KEK Accelerator Test Facility (ATF) for testing with its ultra-low emittance beam. The three BPMs are rigidly mounted inside an alignment frame on six variable-length struts which can be used to move the BPMs in position and angle. they have developed novel methods for extracting the position and tilt information from the BPM signals including a robust calibration algorithm which is immune to beam jitter. To date, they have been able to demonstrate a resolution of approximately 20 nm over a dynamic range of {+-} 20 {micro}m. They report on the progress of these ongoing tests.

EPAC 92

Author : H. Henke
Publisher : Atlantica Séguier Frontières
ISBN 13 : 9782863321157
Total Pages : 942 pages
Book Rating : 4.3/5 (211 download)

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Book Synopsis EPAC 92 by : H. Henke

Download or read book EPAC 92 written by H. Henke and published by Atlantica Séguier Frontières. This book was released on 1992 with total page 942 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Beam Measurement

Author : S. I. Kurokawa
Publisher : World Scientific
ISBN 13 : 9789810238810
Total Pages : 742 pages
Book Rating : 4.2/5 (388 download)

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Book Synopsis Beam Measurement by : S. I. Kurokawa

Download or read book Beam Measurement written by S. I. Kurokawa and published by World Scientific. This book was released on 1999 with total page 742 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume comprises the proceedings of the 8th Joint School on accelerator physics. On this occasion, the US, CERN, Japan and Russia Particle Accelerator Schools collaborated to present the topic "Beam Measurements." The aim was to provide an introduction to the principles of beam dynamics and measurements in circular particle accelerators. This was achieved by a series of lectures under the heading of "single-particle dynamics," "beam measurements" and then "multi-particle dynamics," along with practical courses on feedback and data processing, maps and simulation, diagnostic and microwave measurements. The resulting proceedings represent a unique summary of the currently available knowledge on beam measurements applied to circular particle accelerators.