Progress on the Development of the Next Generation X-ray Beam Position Monitors at the Advanced Photon Source

Conference · Wed Jul 27 00:00:00 EDT 2016

DOI:https://doi.org/10.1063/1.4952810· OSTI ID:1336953

Lee, S. H.; Yang, B. X.; Decker, G.; Sereno, N.; Ramanathan, M.

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 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 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

• Research Organization: Argonne National Lab. (ANL), Argonne, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: AC02-06CH11357
• OSTI ID: 1336953
• Resource Relation: Conference: 12th International Conference on Synchrotron Radiation Instrumentation , 07/06/15 - 07/10/15, New York, NY
• Country of Publication: United States
• Language: English