helicity monitoring

[baltzell]

Would be good to add timelines of:

• beam charge asymmetry from both SLM and FCUP (from REC::scaler)
• fraction of events with -1/0/+1 in REC::Event.helicity (which is after delay correction)

See the corresponding issue.

[c-dilks]

We at least have a QA monitor of the fraction of events where REC::Event.helicity is -1 or +1, but that's downstream of these timelines. I agree it would be good to have such quantities monitored in this repository's timelines, since these timelines are run much more often than the QA ones.

If you're curious about the QA timelines, see for for example RGA Fall2018 inbending timelines, and choose "defined helicity fraction" in the drop-down. QA timelines for other run periods are accessible here (change rga to rgb or rgk in the URL for even more)

[baltzell]

I'm referring to the upstream ones that are run much more frequently.