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User name R. Michaels
Log entry time 17:08:45 on March 8,2012
Entry number 364678
keyword=revival automated ABU (check it)
I've checked and adjusted the script that writes to
EPICS variables HLA:bta_bm_present and HLA:bta_daq_used.
This is for automated ABU. It should work with the new BTA GUI,
just as with the old.
The scheme is simple: we decide if beam is present and if the
DAQ is used. Then write a 0 or 1 to the above variables
corresponding to "no" or "yes". DAQ usage is the "or" of
Left and Right HRS. It looks at the scaler for L1A.
Based on these two variables, plus on info from MCC, the
BTA GUI decides how much ABU, BANU, BNA, etc.
Note, shift workers should always control the numbers in BTA !
I'm using hac_bcm_average (I might switch this later to
IBC1H00BCMAVG). I notice that with beam "off" these
are reading nonzero. I don't see any reason to prefer
one BCM over the other. E.g. hac_bcm_average reads nominally
0.056 with beam off. Units are microamps. Zhihong tells me
there is leakage of 50 nA beam from Hall C and the nominal running
point is 100 nA. So, I set our cut at 0.06 (previously it
was cut at 0.4). This produces results like below, which
I think indicates the script works now. But: stay vigilant !
Thu Mar 8 16:56:16 EST 2012 : Beam 0.0984203 bm_present = 1 daq_used = 1
Thu Mar 8 16:56:48 EST 2012 : Beam 0.0563629 bm_present = 0 daq_used = 1
Thu Mar 8 16:57:20 EST 2012 : Beam 0.0563937 bm_present = 0 daq_used = 1
Thu Mar 8 16:57:53 EST 2012 : Beam 0.108242 bm_present = 1 daq_used = 1
Thu Mar 8 16:58:25 EST 2012 : Beam 0.105772 bm_present = 1 daq_used = 1