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Beam Synchronous Process Variables (PVs) are signals that are tied to the beam pulse that generated them. RTBSA uses this feature to build a pulse by pulse "picture" of the beam so that we can see correlations between signals that would otherwise be hidden.
How it Works
What is a PV?
It's kind of a short hand. We have a lot of devices on site, and those devices generate a lot of data. BPMs (beam position monitors), for example, constantly monitor where the beam is relative to the center of the beam pipe. One singular BPM, however, has a lot of signals that it reads out (chief among them x position, y position, and charge), and each one of those signals has a channel dedicated to reading it. Those channels are PVs.
What does it mean to be tagged to a pulse?
Say that we have a train of pulses with pulse IDs 1 through 4:Gliffy Diagram
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That BPM is going to send out data packets