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@inproceedings{dooling:ipac2021-mopab044,
author = {J.C. Dooling and A.R. Brill and J.R. Calvey},
title = {{Gas Bremsstrahlung Measurements in the Advanced Photon Source Storage Ring}},
booktitle = {Proc. IPAC'21},
pages = {193--196},
eid = {MOPAB044},
language = {english},
keywords = {photon, radiation, operation, detector, injection},
venue = {Campinas, SP, Brazil},
series = {International Particle Accelerator Conference},
number = {12},
publisher = {JACoW Publishing, Geneva, Switzerland},
month = {08},
year = {2021},
issn = {2673-5490},
isbn = {978-3-95450-214-1},
doi = {10.18429/JACoW-IPAC2021-MOPAB044},
url = {https://jacow.org/ipac2021/papers/mopab044.pdf},
note = {https://doi.org/10.18429/JACoW-IPAC2021-MOPAB044},
abstract = {{In the Advanced Photon Source Upgrade storage ring (SR), small-aperture vacuum chambers provide limited conductance for pumping. Non-evaporable getter (NEG) coatings will be used in the SR to support the vacuum. Ion pumps and cold-cathode gauges are typically located away from the vacuum chamber transporting the beam. Measuring gas bremsstrahlung (GB) photons in low-conductance chambers provides a method to determine the pressure at the beam location. We report on GB measurements made in the ID-25 beamline. A Pb:Glass calorimeter radiator generates Cherenkov radiation when high-energy photons cause pair-production within the glass. A photomultiplier tube converts the light pulses to electrical signals. Data was obtained during normal machine operations starting in January 2020. Data collection was facilitated using a 4-channel ITech Beam Loss Monitor FPGA that allows for control of thresholds and attenuation settings in both counting and pulse-height acquisition modes. Count rates and spectra were recorded for the three primary fill patterns typically used during SR operations as well as during gas injection experiments; results of these measurements will be presented.}},
}