skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Progress on the development of the next generation x-ray beam position monitors at the advanced photon source

Abstract

Accurate and stable x-ray beam position monitors (XBPMs) are key elements in obtaining the desired user beam stability in the Advanced Photon Source (APS). The next generation XBPMs for high heat load front ends (HHL FEs) have been designed to meet these requirements by utilizing Cu K-edge x-ray fluorescence (XRF) from a pair of copper absorbers and have been installed at the front ends (FEs) of the APS. Commissioning data showed a significant performance improvement over the existing photoemission-based XBPMs. While a similar design concept can be applied for the canted undulator front ends, where two undulator beams are separated by 1.0-mrad, the lower beam power (< 10 kW) per undulator allows us to explore lower-cost solutions based on Compton scattering from the diamond blades placed edge-on to the x-ray beam. A prototype of the Compton scattering XBPM system was installed at 24-ID-A in May 2015. In this report, the design and test results for XRF-based XBPM and Compton scattering based XBPM are presented. Ongoing research related to the development of the next generation XBPMs on thermal contact resistance of a joint between two solid bodies is also discussed.

Authors:
; ; ; ;  [1]
  1. Advanced Photon Source, Argonne National Laboratory, Argonne, IL 60439 (United States)
Publication Date:
OSTI Identifier:
22608324
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1741; Journal Issue: 1; Conference: SRI2015: 12. international conference on synchrotron radiation instrumentation, New York, NY (United States), 6-10 Jul 2015; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; ADVANCED PHOTON SOURCE; BEAM POSITION; BEAMS; COMMISSIONING; COMPTON EFFECT; COPPER; DIAMONDS; FLUORESCENCE; IRON SULFIDES; MONITORS; PHOTOEMISSION; PHOTONS; SOLIDS; STABILITY; WIGGLER MAGNETS; X RADIATION; X-RAY FLUORESCENCE ANALYSIS; FUNDAMENTAL INTERACTIONS

Citation Formats

Lee, S. H., E-mail: shlee@aps.anl.gov, Yang, B. X., E-mail: bxyang@aps.anl.gov, Decker, G., E-mail: decker@aps.anl.gov, Sereno, N., E-mail: sereno@aps.anl.gov, and Ramanathan, M., E-mail: mohan@aps.anl.gov. Progress on the development of the next generation x-ray beam position monitors at the advanced photon source. United States: N. p., 2016. Web. doi:10.1063/1.4952810.
Lee, S. H., E-mail: shlee@aps.anl.gov, Yang, B. X., E-mail: bxyang@aps.anl.gov, Decker, G., E-mail: decker@aps.anl.gov, Sereno, N., E-mail: sereno@aps.anl.gov, & Ramanathan, M., E-mail: mohan@aps.anl.gov. Progress on the development of the next generation x-ray beam position monitors at the advanced photon source. United States. doi:10.1063/1.4952810.
Lee, S. H., E-mail: shlee@aps.anl.gov, Yang, B. X., E-mail: bxyang@aps.anl.gov, Decker, G., E-mail: decker@aps.anl.gov, Sereno, N., E-mail: sereno@aps.anl.gov, and Ramanathan, M., E-mail: mohan@aps.anl.gov. 2016. "Progress on the development of the next generation x-ray beam position monitors at the advanced photon source". United States. doi:10.1063/1.4952810.
@article{osti_22608324,
title = {Progress on the development of the next generation x-ray beam position monitors at the advanced photon source},
author = {Lee, S. H., E-mail: shlee@aps.anl.gov and Yang, B. X., E-mail: bxyang@aps.anl.gov and Decker, G., E-mail: decker@aps.anl.gov and Sereno, N., E-mail: sereno@aps.anl.gov and Ramanathan, M., E-mail: mohan@aps.anl.gov},
abstractNote = {Accurate and stable x-ray beam position monitors (XBPMs) are key elements in obtaining the desired user beam stability in the Advanced Photon Source (APS). The next generation XBPMs for high heat load front ends (HHL FEs) have been designed to meet these requirements by utilizing Cu K-edge x-ray fluorescence (XRF) from a pair of copper absorbers and have been installed at the front ends (FEs) of the APS. Commissioning data showed a significant performance improvement over the existing photoemission-based XBPMs. While a similar design concept can be applied for the canted undulator front ends, where two undulator beams are separated by 1.0-mrad, the lower beam power (< 10 kW) per undulator allows us to explore lower-cost solutions based on Compton scattering from the diamond blades placed edge-on to the x-ray beam. A prototype of the Compton scattering XBPM system was installed at 24-ID-A in May 2015. In this report, the design and test results for XRF-based XBPM and Compton scattering based XBPM are presented. Ongoing research related to the development of the next generation XBPMs on thermal contact resistance of a joint between two solid bodies is also discussed.},
doi = {10.1063/1.4952810},
journal = {AIP Conference Proceedings},
number = 1,
volume = 1741,
place = {United States},
year = 2016,
month = 7
}
  • Accurate and stable x-ray beam position monitors (XBPMs) are ke y elements in obtaining the desired user beam stability in the Advanced Photon Source (APS). The next generat ion XBPMs for high heat load front ends (HHL FEs) have been designed to meet these requirements by utilizing Cu K-edge x-ray fluorescence (XRF) from a pair of copper absorbers and have been installed at the front ends (FEs) of the APS. Com missioning data showed a significant performance improvement over the existing photoemission-based XBPMs. While a similar design concept can be applied for the canted undulator front ends, where two undulatormore » beams are separated by 1.0-mrad, the lower beam power (< 10 kW) per undulator allows us to explore lower-cost solutions based on Compton scat tering from the diamond blades placed edge-on to the x- ray beam. A prototype of the Compton scattering XBPM system was i nstalled at 24-ID-A in May 2015. In this report, the design and test results for XRF-based XBPM and Compton scattering based XBPM are presented. Ongoing research related to the development of the next generation XBPMs on thermal contac t resistance of a joint between two solid bodies is also discussed« less
  • 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.
  • No abstract prepared.
  • Design criteria are described, and test results are presented, for prototype undulator beam position monitors at the Advanced Light Source (ALS). The design is based on monitors presently in use at the National Synchrotron Light Source, Brookhaven National Laboratory, with modifications to account for the widely varying and large {ital K} values of the undulators to be installed at the ALS. In particular, we have modified the design to simplify the thermal engineering and we have explored techniques to suppress the response of the monitors to soft photons, below 100 eV, so that the beam position can be determined bymore » measuring the higher energy photons which are better collimated.« less
  • The Advanced Photon Source (APS) linac beam position monitors can be used to monitor the position of a beam containing both positrons and electrons. To accomplish this task, both the signal at the bunching frequency of 2856 MHz and the signal at 2{times}2856MHz are acquired and processed for each stripline. The positron beam position is obtained by forming a linear combination of both 2856 and 5712 MHz signals for each stripline and then performing the standard difference over sum computation. The required linear combination of the 2856 and 5712 MHz signals depends on the electrical calibration of each stripline/cable combination.more » In this paper, the calibration constants for both 2856 MHz and 5712 MHz signals for each stripline are determined using a pure beam of electrons. The calibration constants are obtained by measuring the 2856 and 5712 MHz stripline signals at various electron beam currents and positions. Finally, the calibration constants measured using electrons are used to determine positron beam position for the mixed beam case. {copyright} {ital 1998 American Institute of Physics.}« less