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User name Ramesh Subedi
Log entry time 00:07:41 on September20,2009
Entry number 290592
keyword=Shift Summary
Both left and right HRS momentum setting = 3.14159 GeV/c.
Both left and right HRS angle = 14 degree.
Beam energy (3 pass) = 3483.1045 MeV.
Beam current = 98.2 uA.
In previous two hours (now 16:13), beam trip number =7,excellent!
Half wave plate: OUT
16:00: Shift starts with a smooth production with run number 12492.
17:35 Beam away for Hall B tuning.
17:47 Beam back
23:30: While trying to do spot++, we noticed that TS11 (left arm trigger supervisor ROC) was dead. We had to press reset a button on "Trigger Supervison" for the left HRS on the button for "Crate Resets" in Hall A Tools, since we could not telnet hatsv4 2007. While doing this, we could not wait for spot++, and took taking Happex data. Shift crew next shift will do spot++ after the current Happex run ends.
Run Summary:
Run Good Number of Pairs
12492 33.3k
12493 24.3k
12494 7.9k
12495 48.4k
12496 46.1k
12497 47k
12498 46.0k
12499 44.1k
When the beam is non-trippy, one can get about 46 to 48k in a run of one million events. Less number of pairs means either the beam was down for a longer period of time per trip or a frequently tripping beam.