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User name R. Michaels
Log entry time 17:27:18 on June29,2010
Entry number 329158
This entry is a followup to: 329056
keyword=Several BCMs unplugged and related checks
I found that the input to the V2F in the middle counting room
was unplugged for the following BCM signals: U10, U3, Unser,
D3, and D1. I guess it's a casualty of PREX or HAPPEX.
Meanwhile, D10 and U1 were plugged in. Looking at halog 329056,
a short (2 min) run at 30 uA, the charge of 3.5 mC is about right
in the halog for D10 and D1. So, at least two signals exist.
To fix it, I plugged in the cables. I'm not 100% sure about
Unser though; however, we probably don't care. Note, HAPPEX
DAQ does not have several of these signals now. Also don't care.
Fig 1 shows a selection of scaler channels during run 1336
(30 uA on Pb). The T1 rate was 7 MHz. The canvas shows which
BCMs work (see beam trip near event 250K) and some that do not.
Good news: scalers are fine in the datastream and at least two
current monitors work.
On a related note, Stepan and I verified by plugging and unplugging
cables that the scaler.map file is correct. So the students did
this part correctly. I also verified, but using "fake" data,
that the halla_scaler_process.tcl, which produces the halog end-run
entries, is correct: it finds the right data and uses a correct
scaler.map file. (These tests did NOT modify the halog.)