[Color_transp] [EXTERNAL] BCM4A weighted average

[John Matter]

I was using the number of reads. This elog entry uses the increment in the
raw scaler value for the weighting as you described.

https://hallcweb.jlab.org/elogs/Color+Transparency/34

- John


On Tue, Feb 4, 2020 at 7:14 PM Dipangkar Dutta <ddutta07 at gmail.com> wrote:

> Hi John,
> Are you using the number of  reads or the actual increment In the scaler
> value itself.
> It would be more correct to use the increment in the scaler reading.
> For example say during a beam trip there was 3 scaler read and the end of
> the 3rd read the reading of the scaler 1000 then the beam turns back on and
> it stayed on for 3 reads, the reading at the 6th read is 99000
> Then the weight for those 3 scaler reads when the beam was on should be
> 1/(99000-1000)
> And so on for the rest of the beam on reads.
> Cheers
> Dipangkar
>
>
> On Tue, Feb 4, 2020 at 5:14 PM John Matter <jcm6fv at virginia.edu> wrote:
>
>> Thank you for taking a look.
>>
>> For the weights, I was initially using each region's uncertainty but I
>> was calculating the uncertainty wrong. I fixed this, but these runs still
>> looked off.
>>
>> I changed the weighting to be the number of scaler reads in the region
>> when the beam is not tripped. I believe this is what we discussed in a
>> recent meeting.
>>
>> I updated the elog entry with the new values.
>>
>> https://hallcweb.jlab.org/elogs/Color+Transparency/33
>>
>> - John
>>
>>
>> On Mon, Feb 3, 2020 at 7:02 PM Dipangkar Dutta <ddutta07 at gmail.com>
>> wrote:
>>
>>> Hi John,
>>> I looked through your plots. Most of them make sense. But there are a
>>> few runs which seem to be lower than that one expects from visual
>>> inspection, sometime they are quite a bit lower.
>>> And the pattern seems to be that those runs where the blue point is
>>> larger than the red point they seem to have a problem (ie the av.
>>> weighted current seems too low).
>>> Specifically, look at runs 2279, 2283, 2429, 2430, 2431, 2432, 3188
>>> Cheers
>>> Dipangkar
>>>
>>> On Mon, Feb 3, 2020 at 3:14 PM John Matter <jcm6fv at virginia.edu> wrote:
>>> >
>>> > Hi all,
>>> >
>>> > I just posted some slides about the BCM averaging. If the averages
>>> look sensible to everyone, I will update the spreadsheet.
>>> >
>>> > https://hallcweb.jlab.org/elogs/Color+Transparency/33
>>> >
>>> > - John
>>> > _______________________________________________
>>> > Color_transp mailing list
>>> > Color_transp at jlab.org
>>> > https://mailman.jlab.org/mailman/listinfo/color_transp
>>>
>>
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