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A proposed orbit and vertical dispersion correction system for PEP

Description: The proposed arrangement of position monitors and dipole magnets for the closed orbit correction system in PEP is described. The computer code ALIGN, which simulates and corrects closed orbit displacements, has been used to study the most effective layout of monitors and correctors. The vertical dispersion function has been computed before and after closed orbit correction. The results indicate that the residual vertical dispersion after the orbit is corrected could exceed the tolerable values.… more
Date: July 1, 1978
Creator: Close, E.; Cornacchia, M.; King, A. S. & Lee, M. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Modification of the code BEAMCORR, and some simulation results of the magnet and achromat misalignments for the SLC South Arc

Description: An important decision has been made regarding the correction scheme for the arcs leading to the adoption of the so called scheme I. In this scheme the beam position data are collected from single-plane x and y Beam Position Monitors (BPMs), which are placed in the drift spaces adjacent to the downstream D- and F-magnets correspondingly. Similarly, single-plane x and y correctors are used for moving the upstream end of the corresponding magnets. In the present simulation this scheme is used excl… more
Date: July 11, 1984
Creator: Shoaee, H. & Kheifets, S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Description of the FCUP code used to compute currents due to recoil protons from CH/sub 2/ foils

Description: A computer code, FCUP, was developed at EG and G during the period from 1973 to the present to compute proton currents produced by a time- and energy-dependent neutron flux striking a CH/sub 2/ foil and knocking protons into a detector placed at an angle with respect to the target foil and the neutron beam. This report describes the methods of calculation used and the physical assumptions and limitations involved and suggests possibilities for improving the calculations.
Date: July 1, 1982
Creator: Stelts, M. L.; Glasgow, D. W.; Wood, B. E. & Craft, A. D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Limits to the resolution of beam size measurement from fluorescent screens due to the thickness of the phosphor

Description: This paper discusses the use of fluorescent screens for the measurement of beam profiles on non-circulating particle beams. An expression for the intensity of the beam profile as a function of phosphor thickness is given. 3 refs., 8 figs.
Date: July 20, 1988
Creator: Johnson, C. D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Temperature rise in iron beam position monitors

Description: This note presents the results of EGS calculations for the temperature rise in an iron beam position monitor strip in the SLC arcs for a 50 GeV incident electron beam. Temperature rises of about 830/sup 0/C per pulse are possible for 50..mu.. (Gaussian sigma) beams of 5 x 10/sup 10/ electrons per pulse if the angle of incidence is great (i.e., around 30 mradians).
Date: July 24, 1984
Creator: Nelson, W. R. & Jenkins, T. M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Fast ion chambers for SLC

Description: Beam diagnostic ion chambers are used throughout the SLC to perform a variety of tasks including locating beam losses along the beam direction, determining localized losses from individual bunches in a multibunch beam, and detecting scattered particles from beam profile wire scanners where backgrounds are too high to use photomultiplier tubes. Construction and instrumentation of very fast ion chambers with pulse duration of less than 60ns are detailed. Long ion chambers referred to as PLIC (Pan… more
Date: July 1, 1993
Creator: McCormick, D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Particle diffusion from resonance islands in Aladdin at SRC

Description: The dynamics of the beam in the resonance islands was studied on the electron storage ring Aladdin at the Synchrotron Radiation Center (SRC). The authors especially studied the horizontal third- and fourth-integral resonances driven by sextupole fields in the first and second order. A fast kicker was fired to kick the beam into one of the outboard stable islands. The beam took on a quasi-Gaussian distribution and slowly diffused out of the island. The diffusion rate and its dependence on the st… more
Date: July 1, 1993
Creator: Liu, J.; Crosbie, E.; Teng, L.; Bridges, J.; Ciarlette, D.; Kustom, R. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Status and test report on the LANL-Boeing APLE/HPO flying-wire beam-profile monitor. Status report

Description: The High-Power Oscillator (HPO) demonstration of the Average Power Laser Experiment (APLE) is a collaboration by Los Alamos National Laboratory and Boeing to demonstrate a 10 kW average power, 10 {mu}m free electron laser (FEL). As part of the collaboration, Los Alamos National Laboratory (LANL) is responsible for many of the electron beam diagnostics in the linac, transport, and laser sections. Because of the high duty factor and power of the electron beam, special diagnostics are required. Th… more
Date: July 1, 1994
Creator: Wilke, M.; Barlow, D.; Fortgang, C.; Gilpatrick, J.; Meyer, R.; Rendon, A. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Dynamic range extension of BPM at the NSLS

Description: In order to overcome range limitations, the existing Beam Position Monitor (BPM) receiver was modified, extending the dynamic range from 35 dB to 60 dB. The modifications include the insertion of an RF PIN attenuator, RF amplifier, and control circuitry in line with the RF link to add an extra 25dB to the existing AGC loop. This stand alone 25dB RF gain control stage is integrated into the present system without any change to the existing receiver.
Date: July 1, 1993
Creator: Bordoley, M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Beam position monitor calibration for the Advanced Photon Source

Description: 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 ({approx_lt} 100 {mu}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… more
Date: July 1, 1993
Creator: Chung, Y.; Decker, G.; Kahana, E.; Lenkszus, F.; Lumpkin, A. & Sellyey, W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Measurement of beta-function and phase using the response matrix

Description: A new method for extracting the beta-function and phase for the beam position monitors (BPMs) and the corrector magnets from the measured response matrix is presented. The response matrix relates beam motion at the BPM locations to changes in corrector magnet strengths. Using the model beta and phase as the initial values, new values are obtained by iteration. The accuracy of beta and phase thus calculated is limited by the accuracy of response matrix measurement and calibration of BPMs and cor… more
Date: July 1, 1993
Creator: Chung, Y.; Decker, G. & Evans, K., Jr.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Self triggered single pulse beam position monitor

Description: A self triggered beam position monitor (BPM) has been developed for the NSLS injection system to provide single pulse orbit measurements in the booster synchrotron, linac, and transport lines. The BPM integrates the negative going portion of 3 nS wide bipolar pickup electrode signals. The gated, self triggering feature confines critical timing components to the front end, relaxing external timing specifications. The system features a low noise high speed FET sampler, a fiber optic gate for bunc… more
Date: July 1, 1993
Creator: Rothman, J. L. & Blum, E. B.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Results of prototype particle-beam diagnostics tests for the Advanced Photon Source (APS)

Description: The Advanced Photon Source (APS) will be a third-generation synchrotron radiation source (hard x-rays) based on 7-GeV positrons circulating in a 1,104-m circumference storage ring. In the past year a number of the diagnostic prototypes for the measurement of the charged-particle beam parameters throughout the subsystems of the facility (ranging from 450-MeV to 7-GeV positrons and with different pulse formats) have been built and tested. Results are summarized for the beam position monitor (BPM)… more
Date: July 1, 1993
Creator: Lumpkin, A. H.; Chung, Y.; Kahana, E.; Patterson, D.; Sellyey, W.; Votaw, A. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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A fifth harmonic rf bunch monitor for the ANL-APS electron linac

Description: The function of a fifth harmonic (14.28 GHz) bunch monitor is to provide a signal which is proportional to the electron beam bunch size. The monitoring of the rf power signal at 14.28 GHz enables the operator to optimize the rf bunching of the beam at the end of the first accelerating section where the full bunching has been formed and remains mainly constant in size throughout the rest of the electron linac. A modified version of the SLAC original bunch monitor has been fabricated and its rf p… more
Date: July 1, 1993
Creator: Nassiri, A. & Grelick, A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Optimization method for orbit correction in accelerators

Description: The authors present a method to minimize the corrector strengths required to reduce the rms beam orbit. Any least square correction method will usually lead to undesirably strong corrector settings. The method, they are presenting, minimizes the total kick vector by finding the eigensolutions of the equation {rvec X} = A{theta}, where {rvec X} is the orbit change vector {theta} is the kick vector and A is the response matrix. Since A is not necessarily a symmetric or even square matrix they sym… more
Date: July 1, 1993
Creator: Bozoki, E. & Friedman, A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Tune measurement in the APS ring

Description: The APS system will contain three rings. The first is a positron accumulator ring (PAR). Its function is to coalesce 24, 30-ns-long positron bunches into one 290-ps bunch. The second is the injector synchrotron (IS). It accelerates the 450-MeV positron bunches to 7 Gev for injection into the storage ring (SR). Betatron and synchrotron motion frequently occurs in circular machines, without any deliberate excitation. However, the amplitudes of this motion cannot be predicted. Therefore, it is des… more
Date: July 1, 1993
Creator: Sellyey, W.; Kahana, E. & Wang, X.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Compensation for the effect of vacuum chamber eddy current by digital signal processing for closed orbit feedback

Description: 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 sto… more
Date: July 1, 1993
Creator: Chung, Y.; Emery, L. & Kirchman, J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Performance of photon position monitors and stability of undulator beams at the Advanced Light Source

Description: Position monitors are implemented in three undulator beamlines at the ALS. Their performance has been studied carefully on one of these lines and is reviewed. The monitors work as expected and show the ALS to be an exceptionally stable source of synchrotron radiation.
Date: July 15, 1994
Creator: Warwick, T.; Andresen, N.; Portmann, G. & Jackson, A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Performance of the advanced photon source (APS) linac beam position monitors (BPMs) with logarithmic amplifier electronics

Description: This paper discusses the performance of the logarithmic amplifier electronics system used with stripline BPMs to measure electron and positron beam positions at the APS linac. The 2856-MHz, S-band linac accelerates 30-nsec pulses of 1.7 A of electrons to 200 MeV, and focuses them onto a positron conversion target. The resulting 8 mA of positrons are further accelerated to 450 MeV by the positron linac. Beam position resolutions of 50 {mu}m are easily obtainable in both the electron and positron… more
Date: July 1, 1995
Creator: Fuja, R. E. & White, M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Digital signal processing for the APS transverse and longitudinal damping system

Description: The Advanced Photon Source (APS) at Argonne National Laboratory will be a 7-GeV machine. It is anticipated that for beam operations beyond the baseline design of 100 mA stored beam current, a transverse and longitudinal damping system is needed to damp instabilities. A key part of this digital damping system is digital signal processing. This digital system will be used to process samples taken from the beam and determine appropriate correction values to be applied to the beam. The processing w… more
Date: July 1, 1995
Creator: Barr, D. & Sellyey, W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Operational aspects of experimental accelerator physics

Description: During the normal course of high energy storage ring operations, it is customary for blocks of time to be allotted to something called ``machine studies,`` or more simply, just ``studies.`` It is during these periods of time that observations and measurement of accelerator behavior are actually performed. Almost invariably these studies are performed in support of normal machine operations. The machine physicist is either attempting to improve machine performance, or more often trying to recove… more
Date: July 1, 1995
Creator: Decker, G.A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The APS booster synchrotron: Commissioning and operational experience

Description: The Advanced Photon Source (APS) at Argonne National Laboratory (ANL) was constructed to provide a large user community with intense and high brightness synchrotron radiation at x-ray wavelengths. A 7-GeV positron beam is used to generate this light. Acceleration of the beam from 450 MeV to 7 GeV is accomplished at a 2-Hz repetition rate by the booster synchrotron. Commissioning of the booster began in the second quarter of 1994 and continued on into early 1995. The booster is now routinely use… more
Date: July 1, 1995
Creator: Milton, S. V.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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The development of beam current monitors in the APS

Description: The Advanced Photon Source (APS) is a third-generation 7-GeV synchrotron radiation source. The precision measurement of beam current is a challenging task in high energy accelerators, such as the APS, with a wide range of beam parameters and complicated noise, radiation, and thermal environments. The beam pulses in the APS injector and storage ring have charge ranging from 50pC to 25nC with pulse durations varying from 30ps to 30ns. A total of nine non- intercepting beam current monitors have b… more
Date: July 1, 1995
Creator: Wang, X.; Lenkszus, F. & Rotela, E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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A low-cost non-intercepting beam current and phase monitor for heavy ions

Description: A low cost ion beam measurement system has been developed for use at ATLAS. The system provides nondestructive phase and intensity measurement of passing ion beam bunches by sensing their electric fields. Bunches traverse a short tubular electrode thereby inducing displacement currents. These currents are brought outside the vacuum jacket where a lumped inductance resonates electrode capacitance at one of the bunching harmonic frequencies. This configuration yields a basic sensitivity of a few … more
Date: July 1, 1995
Creator: Bogaty, J. M. & Clifft, B. E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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