[Xrayops] Erroneous beam motion indications

[APS Experiment Hall X-ray Operations Problem List]

Over the past couple of days there have been a small number of short-lived beam motion indications. These were erroneous indications due to an erratic BPM which is not being used by orbit control (there was no effect on stored beam). Since the frequency of these erroneous beam motion indications increased recently, the faulty BPM was removed from the RMS calculation. This will eliminate the erroneous readings.
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