[Hps-analysis] Drastic difference between 7487 and 7807.

[Sho Uemura]

I think this is from a change in conditions DB constants (SVT phase 
offset) for the SVT. This is a number that can change depending on the 
run, and has to be filled in after the run by looking at the data. The 
value for run 7487 has been correct since 2/25. I set the value for 7807 
on Wednesday (and I changed the default value to something that matches 
most of the runs we have taken).

Maybe your 7807 DQM was run after the change, and the 7487 DQM was run 
before. Rerunning recon and DQM will fix it.

On Fri, 11 Mar 2016, Valery Kubarovsky wrote:

> Hi All:
> Please take a look to runs 7807 (3/7/2016) and 7487 (2/21/2016).
> The trigger is almost the same, the current 200 nA.
> It looks like the number of reconstructed tracks is almost factor of 5 higher the last weekend than two weeks ago. Can somebody tell me what is the reason?
> Thanks,
> Valery
>
>
> ----- Original Message -----
>> From: "Bradley T Yale" <btu29 at wildcats.unh.edu>
>> To: "hps-software at SLAC.STANFORD.EDU" <hps-software at slac.stanford.edu>, "hps-analysis at jlab.org" <hps-analysis at JLAB.ORG>,
>> "Sebouh Paul" <sebouh.paul at gmail.com>
>> Sent: Thursday, March 10, 2016 7:06:17 PM
>> Subject: Too few Pass6 Moller events in MC
>
>> I know this was supposed to be the "final pass",
>>
>> but it looks like there are far too few Moller events being readout in Pass 6
>> Monte Carlo.
>>
>>
>> Looking further into this, it is because the >3-hit clusters in Pass 6 are
>> getting decimated BEFORE the trigger for some reason (see attached plots), and
>> so they no longer pass the cluster hit count threshold. These were made using
>> exactly the same filtered SLIC events, and the same steering file with the same
>> apparent thresholds in the GTP clusterer and trigger.
>>
>> The difference must be elsewhere in the drivers themselves.
>>
>>
>> These plots compare
>>
>> hps-distribution-3.5-20151218.205540-15-bin.jar
>>
>> with
>>
>> hps-distribution-3.6-bin.jar
>>
>>
>> both using the 'EngineeringRun2015TrigSingles1_Pass2.lcsim' steering file.
>>
>>
>> A more recent 3.5 jar (1/25/2016) gives a similar number of events as Pass 4,
>> and so the key difference must be with 3.6.
>>
>>
>> -Brad
>>
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