ETOW Gains - using "sums" to identify outliers

Goal:  Use Alice B's analysis of endcap tower spectra, calculating sums of counts over a fixed range in (adc - ped), to search for "outliers," and in particular to check that any tower that was 'touched' during the shutdown is still giving results consistent with the average from similar towers.

Method:

1. Sums were extracted over the adc range 20-100 (above pedestal) for all 720 endcap towers, for a series of runs used in timing scans.  Details of the runs selected, and the timing delays used for each, can be found at Alice's blog
2. Based on the above analysis, Will decided on the optimal TCD delay settings.  A summary of these can be found in Will's blog
3. To test for problematic channels, I used Alice's results for the scan with 60 ns delay (run 10065037) to examine all towers in crates 1 and 2, and used the scan with 40 ns delay (run 10065035) for all towers in crates 3-6.  An ascii file giving the crate #, channel #, adc sum, and sum error for each tower, for each of these two delay settings, is available here
4. Because these times are not exactly at their optimal values (60 is ~4 ns too late, while 40 is ~2-3 ns too early), the "averages" and "sigmas" I compare to are over all towers in the same eta ring, but only those in crates from the same timing scan, e.g., for a tower like 02TC10, which is in crate 2, I would compare its adc sum to the average of the 20 towers found in crates 1 and 2 at etabin = 10.
5. Anything listed as "not analyzed" means that Alice found too few counts in the adc range to learn anything useful - usually indicates a dead or low gain channel.

Results:  These fall into four main categories

Known bad channels
1. 06TA03 (cr 4 ch 18):   reported to be still bad and masked in fee cr4 bd1 JP4
   =>  not analyzed
2. 07TC05 (cr 4 ch 117):   reported to be still bad and masked in fee cr4 bd4 JP3
   =>  still bad:  sum = 26 ± 6    avg = 155, sig = 30
3. 12TC05 (cr 1 ch 97):   reported to be still bad and masked in fee cr1 bd4 JP1
   => known to have very high ped, not analyzed

Needed to be checked
1. 02TC06 (cr 2 ch 98):   seems ok right now, but still marked in Pplots as bad
   =>  looks fine:  sum = 187 ± 16    avg = 192, sig = 42
2. 04TD10 (cr 3 ch 45):   seems ok now, not masked
   =>  looks fine:  sum = 223 ± 18    avg = 187, sig = 35

Fixed before run
1. 09TA05 (cr 5 ch 105):   base replaced, looks ok
   =>  looks fine now:  sum = 177 ± 16    avg = 155, sig = 30
2. 11TA01 (cr 6 ch 56):   base replaced, looks ok
   =>  looks fine now:  sum = 128 ± 13    avg = 120, sig = 26
3. 12TD01 (cr 1 ch 40):   HV recently lowered by 125 V, current gain now looks too low
   => PROBLEM!    gain very low now:  not analyzed, average of peers = 140
4. 03TC09 (cr 2 ch 76):   cable replaced, now looks ok
   => PROBLEM!    gain too low now:  sum = 42 ± 8    avg = 173, sig = 40
5. 05TA03 (cr 3 ch 58):   cable replaced, now looks ok
   =>  looks fine:  sum = 144 ± 14    avg = 161, sig = 40
6. 08TC05 (cr 5 ch 101):   cable replaced, now looks ok
   =>  looks fine:  sum = 150 ± 14    avg = 155, sig = 30

Extreme outliers
• 07TD10 (cr 5 ch 5) and 11TB08 (cr 6 ch 67) had sums that were very high
  =>  need to monitor these to see if they are flagged as "hot".