[Hallc_running] [New Logentry] Friday RC update

brads at jlab.org brads at jlab.org
Fri Jun 28 12:25:03 EDT 2019

Logentry Text:
Spotty beam with significant downtimes last night, but some progress was made.  Pion-rates seem to be about 50% of what was expected, but there are some questions about the pion-yield script.  Experts are digging into it -- if we're lucky, we are undercounting.

Q2=0.375, W=2.20 is complete
Q2=0.425, W=2.20 is in progress.

As of now, we have 3--4 beam-hours of data taking to go before we will take a controlled access to move the SHMS out to a larger angle.  The expectation is that this will happen late-day shift, early-swing.

After that we must complete the 3-pass run plan and move to 4-pass.  The earliest the 4-pass change could happen at this point is Sunday.

Still on the todo-list for 3-pass:
- H elastic singles: p=-2,3, -1,96, -1.85
- heep check coin run
- Arc energy measurement (TBD?)


This is a plain text email for clients that cannot display HTML.  The full logentry can be found online at https://logbooks.jlab.org/entry/3695971
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