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@unpublished{portmann:ibic2020-frao03,
author = {G.J. Portmann and M.J. Chin and W.E. Norum and J.M. Weber},
title = {{BPM Electronics With Self-Calibration at the ALS}},
booktitle = {Proc. IBIC'20},
language = {english},
intype = {presented at the},
series = {International Beam Instrumentation Conference},
number = {9},
venue = {Santos, Brazil},
publisher = {JACoW Publishing, Geneva, Switzerland},
month = {oct},
year = {2020},
note = {presented at IBIC2020 in Santos, Brazil, unpublished},
abstract = {As light source electron beam sizes shrink, orbit stability demands increase. There are many factors that contribute to orbit stability. This paper will focus on beam position monitor (BPM) electronics and describe a self-calibration technique implemented at the ALS. The ALS commissioned new BPM electronics about 3 years ago. The electronic design is similar to that of the NSLS-II BPMs. For instance, the digital front end is the same as the NSLS-II design. The ALS team changed the analog front end (although conceptually similar) and the FPGA firmware to further the pilot tone calibration method begun at NSLS-II. The choice of bandpass filters is critical to the success of a pilot tone calibration scheme, as is the digital processing applied to the beam signal and pilot tones. The initial goal was to accurately track and calibrate slow thermally induced position errors. This capability has been expanded to track and remove differences between the BPM channels up to the system bandwidth of about 5kHz.},
}