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Thermal and structural analysis of high precision beamline position monitors for synchrotron x-ray beams

Description: The photon beam position monitors (PBPM) on the front end of the 7-GeV Advanced Photon Source (APS) synchrotron facility under construction at Argonne National Laboratory (ANL) are precision devices that measure spatial as well as angular positions of the x-ray beams. There exist two such devices on each APS front end, and they are set approximately 4 m apart. The required spatial resolution of these devices is of the order of a few microns; the required angular resolution is less than a micro-… more
Date: January 1, 1992
Creator: Wang, Z.; Shu, D.; Khounsary, A.M. & Kuzay, T.
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Partner: UNT Libraries Government Documents Department
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A technique for aligning sextupole systems using beam optics

Description: A technique for beam based alignment of sextupole system is developed exploiting the enhancement effect of orbit differences by the sextupoles. This technique can in principle be applied to sextupole or sextupole strings with controlled orbit pattern and BPM configurations. This paper will discuss the theoretical basis, special optimization considerations and expected accuracy. Application to the SLC final focus is also discussed.
Date: March 1, 1992
Creator: Chao, Yu-Chiu.
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Partner: UNT Libraries Government Documents Department
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Longitudinal bunch profile measurements with striplines

Description: Striplines beam position monitors are normally considered low frequency devices with at best an octave bandwidth. Some attempts to make them very high frequency and broadband have led to long and complicated tapered construction. However, conventional uniform coupling striplines can provide very high frequency and broadband response, if the downstream induced signal is gated out electronically. In this case, the leading edge beam signal can provide bunch length and even current profile informat… more
Date: January 1, 1992
Creator: Kramer, S. L.
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Partner: UNT Libraries Government Documents Department
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Transverse wakefields at high dispersion

Description: In high energy linear colliders the transverse beam emittance has to be preserved in order to achieve small interaction spots. If the beam is off-center in an accelerating cavity, it excites transverse wakefields, mainly the dipole mode, which deflects the tail of the beam leading to an emittance growth. In a high dispersive region, even a well centered beam can excite wakefields of higher order modes since the energy spread of the beam causes a transverse beam size which is comparable with the… more
Date: March 1, 1992
Creator: Decker, F.J.
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Partner: UNT Libraries Government Documents Department
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Automatic beamline calibration procedures

Description: 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 so… more
Date: March 1, 1992
Creator: Corbett, W.J. (Stanford Univ., CA (United States). Stanford Synchrotron Radiation Lab.); Lee, M.J. (Stanford Linear Accelerator Center, Menlo Park, CA (United States)) & Zambre, Y. (SRI International, Menlo Park, CA (United States))
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Partner: UNT Libraries Government Documents Department
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Beam based alignment of sector-1 of the SLC linac

Description: A technique is described which uses the beam to simultaneously measure quadrupole magnet and beam position monitor (BPM) transverse misalignments. The technique is applied to sector-1 of the SLC linac where simultaneous acceleration of electron and positron beams with minimal steering elements and BPMs makes quadrupole alignment critical for high transmission of the large transverse emittance positron beam. Simulation results as well as measurements are presented.
Date: March 1, 1992
Creator: Emma, P.
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Partner: UNT Libraries Government Documents Department
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Design and performance of the Booster Beam Position Monitor system

Description: Instrumentation has bean built to measure heavy ion and proton beam orbits over an intensity range of 2 [times] 10[sup 10] to 1.5 [times] 10[sup l3] particles per pulse. Twenty-two horizontal and 24 vertical pairs of electrostatic Pickup Electrodes (PUEs), each with a built-in test port, are interfaced with wideband, gain selectable front end electronics. The resulting real-time signals are linearly related (both in amplitude and temporal response) to the sum and difference of the charge induce… more
Date: January 1, 1992
Creator: Ciardullo, D. J.; Abola, A.; Beadle, E.; Brennan, J. M.; Smith, G. A.; Thomas, R. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Design studies on the RHIC position monitor system

Description: The Relativistic Heavy Ion Collider (RHIC) under construction at Brookhaven National Laboratory will consist of two superconducting storage rings 3.8 km in circumference sharing one tunnel in a side by side configuration. After injection from the existing AGS, the collider will accelerate and store a range of ion species extending from protons through gold to energies of 250 GeV for protons and 100 GeV/nucleon for fully stripped gold ions. Storage times should exceed 10 hours. As in most modem … more
Date: September 1, 1992
Creator: Shea, T.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The APS linac beam position monitors and electronics

Description: Beam position monitors using stripline pickups for 30 ns long electron and positron beam bunches have been built and responses were measured in the vertical and horizontal directions. Log amplifiers used for signal processing have a dynamic range of 40 dB and are scaled for 50 mV/dB sensitivity. In this paper we describe the design of the detectors, the signal processing electronics, and the results of the position-to-signal mapping using a wire. Beam position measurements using a prototype det… more
Date: January 1, 1992
Creator: Fuja, R. & Chung, Youngjoo.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Beam position and total current monitor for heavy ion fusion beams

Description: Heavy Ion Fusion requires moderate currents, 1-10A, for a duration of about 1 [mu]s. For accurate beam transport, the center of charge must be located to within [plus minus] 100 [mu]m. Beam position and intensity may be excited at frequencies approaching 10 MHz, and the monitoring system must have adequate bandwidth to respond at these frequencies. We have modified the Rogowski technique by using distributed reactance multiturn magnetic loops so that it is suitable for measuring current positio… more
Date: October 1, 1992
Creator: Berners, D. & Reginato, L.L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Preliminary design of the BPM electronics memory scanner/dual boxcar averager for the Advanced Photon Source

Description: The memory scanner/dual boxcar averager are VXI modules that are part of the Advanced Photon Source (APS) beam position monitor (BPM) data acquisition system. Each pair of modules is designed to gather and process digital data from up to nine digital channels transmitting the BPM data from the storage ring (360 locations) and the synchrotron (80 locations). They store beam history in a buffer, store the latest scan of all channels, and provide boxcar averaged X and Y position data for the globa… more
Date: January 1, 1992
Creator: Votaw, A.J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Preliminary design of the beam loss monitor system for the Advanced Photon Source

Description: The preliminary design of the beam loss monitor for the ANL Advanced Photon Source is based on the use of an air dielectric coaxial cable as a long ionization chamber. Each coaxial cable section uses a high sensitivity DC current-to-voltage converter with both linear and integrating ranges. Pulse timing circuits determine the positions of individual losses by measuring the time at which the resulting voltage pulses arrive at the beginning of the coaxial ionization chamber. A possible timing amb… more
Date: December 1, 1992
Creator: Patterson, D. R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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The APS linac beam position monitors and electronics

Description: Beam position monitors using stripline pickups for 30 ns long electron and positron beam bunches have been built and responses were measured in the vertical and horizontal directions. Log amplifiers used for signal processing have a dynamic range of 40 dB and are scaled for 50 mV/dB sensitivity. In this paper we describe the design of the detectors, the signal processing electronics, and the results of the position-to-signal mapping using a wire. Beam position measurements using a prototype det… more
Date: December 1, 1992
Creator: Fuja, R. & Chung, Youngjoo
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Fluorescent screens and image processing for the APS linac test stand

Description: A fluorescent screen was used to monitor relative beam position and spot size of a 56-MeV electron beam in the linac test stand. A chromium doped alumina ceramic screen inserted into the beam was monitored by a video camera. The resulting image was captured using a frame grabber and stored into memory. Reconstruction and analysis of the stored image was performed using PV-WAVE. This paper will discuss the hardware and software implementation of the fluorescent screen and imaging system. Propose… more
Date: December 1, 1992
Creator: Berg, W. & Ko, K.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Preliminary design of the BPM electronics memory scanner/dual boxcar averager for the Advanced Photon Source

Description: The memory scanner/dual boxcar averager are VXI modules that are part of the Advanced Photon Source (APS) beam position monitor (BPM) data acquisition system. Each pair of modules is designed to gather and process digital data from up to nine digital channels transmitting the BPM data from the storage ring (360 locations) and the synchrotron (80 locations). They store beam history in a buffer, store the latest scan of all channels, and provide boxcar averaged X and Y position data for the globa… more
Date: December 31, 1992
Creator: Votaw, A. J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Longitudinal Bunch Profile Measurements With Striplines

Description: Striplines beam position monitors are normally considered low frequency devices with at best an octave bandwidth. Some attempts to make them very high frequency and broadband have led to long and complicated tapered construction. However, conventional uniform coupling striplines can provide very high frequency and broadband response, if the downstream induced signal is gated out electronically. In this case, the leading edge beam signal can provide bunch length and even current profile informat… more
Date: May 1992
Creator: Kramer, S. L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Beam position and total current monitor for heavy ion fusion beams

Description: Heavy Ion Fusion requires moderate currents, 1-10A, for a duration of about 1 {mu}s. For accurate beam transport, the center of charge must be located to within {plus_minus} 100 {mu}m. Beam position and intensity may be excited at frequencies approaching 10 MHz, and the monitoring system must have adequate bandwidth to respond at these frequencies. We have modified the Rogowski technique by using distributed reactance multiturn magnetic loops so that it is suitable for measuring current positio… more
Date: October 1, 1992
Creator: Berners, D. & Reginato, L. L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Localized control of the orbit in the RHIC insertions

Description: It is proposed here that, for RHIC92 insertions, we remove the corrector from Ql and the beam position monitor (BPM) from Q2 in order to alleviate difficulties associated with the physical layout of the quadrupole triplet (Ql-Q2-Q3). Furthermore, it is suggested that there should be both (horizontal and vertical) types of BPMs at each end of the free space between Q3 and Q4 and between Q7 and Q8 so that one can measure the direction of the closed orbit. With this model, a localized control of t… more
Date: August 1, 1992
Creator: Ohnuma, S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Beam position monitoring system for the proposed asymmetric B Factory at SLAC

Description: The beam position monitor system of the B Factory is drastically different from the actual PEP system. We present a description of the new configuration and list the features which have been adopted to make this system a highly reliable diagnostic tool. An electrode geometry is suggested, based on the maximum-acceptable power extracted from the beam, and the measurement resolution is estimated by assuming some practical bandwidth and the noise level. Finally, an estimate of the system precision… more
Date: October 1, 1992
Creator: Pellegrin, Jean-Louis
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Laser beam control and diagnostic systems for the copper-pumped dye laser system at Lawrence Livermore National Laboratory

Description: The laser system described in the previous paper is used for experiments in which success requires tight tolerances on beam position, direction, and wavefront. Indeed, the optimum performance of the laser itself depends on careful delivery of copper laser light to the dye amplifiers, precise propagation of dye laser beams through restricted amplifier apertures, and accurate monitoring of laser power at key locations. This paper describes the alignment systems, wavefront correction systems, and … more
Date: November 1, 1992
Creator: Bliss, E. S.; Peterson, R. L.; Salmon, J. T. & Thomas, R. A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Advanced Light Source instrumentation overview

Description: The accelerator instrumentation played a vital role in commissioning the ALS injector accelerator. It helped us to see whether electron dynamics agreed with our theoretical predictions and important beam parameters met the design specifications. It helped us to see where beam losses occurred and why. In this paper we will start with a brief description of the ALS accelerator complex and the expected performance of it. Then we will describe each diagnostics instrument by its construction, operat… more
Date: October 1, 1992
Creator: Kim, C. H. & Hinkson, J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Design studies on the RHIC position monitor system

Description: The Relativistic Heavy Ion Collider (RHIC) under construction at Brookhaven National Laboratory will consist of two superconducting storage rings 3.8 km in circumference sharing one tunnel in a side by side configuration. After injection from the existing AGS, the collider will accelerate and store a range of ion species extending from protons through gold to energies of 250 GeV for protons and 100 GeV/nucleon for fully stripped gold ions. Storage times should exceed 10 hours. As in most modem … more
Date: September 1, 1992
Creator: Shea, T.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Design and performance of the Booster Beam Position Monitor system

Description: Instrumentation has bean built to measure heavy ion and proton beam orbits over an intensity range of 2 {times} 10{sup 10} to 1.5 {times} 10{sup l3} particles per pulse. Twenty-two horizontal and 24 vertical pairs of electrostatic Pickup Electrodes (PUEs), each with a built-in test port, are interfaced with wideband, gain selectable front end electronics. The resulting real-time signals are linearly related (both in amplitude and temporal response) to the sum and difference of the charge induce… more
Date: October 1, 1992
Creator: Ciardullo, D. J.; Abola, A.; Beadle, E.; Brennan, J. M.; Smith, G. A.; Thomas, R. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Measurement of wakefields generated in accelerator test structures using the SLC

Description: Research is underway at SLAC to develop accelerator structures for the next generation linear collider. An important feature of the design is a detuning of the dipole modes of the cells to suppress the long-range transverse wakefield by two orders of magnitude. This paper describes a facility, called ASSET, that will be incorporated into the SLAC Linear Collider (SLC) to test the long-range wakefield suppression and also to measure the other components of the wakefields generated in accelerator… more
Date: October 1, 1992
Creator: Adolphsen, C.; Bane, K.; Loew, G.; Ruth, R.; Thompson, K. & Wang, J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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