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[Tonko Ljubicic <tonko AT bnl.gov>]

I looked at this (again) but I need some concrete help e.g. I don't
know what a "group" is.
So how about you send me an algorithm in C/C++ assuming
that the ADC data of some APV is in an array:

apv[i][ch][tb]

where i=event (0..N), ch=channel(0..127), tb=timebin(0..8)



On Mon, Aug 23, 2021 at 9:20 PM Xu Sun <sunxuhit AT gmail.com> wrote:
>
> Hi Flemming,
>
> Sorry for the very late reply. I somehow missed this email.
>
> Please find my reply below:
> > a) For the CMN calculation you take a sum in a group over non hit 
> > channels?
> > What is the decision for not having a hit? I assume it is adc value of 
> > pedestal+some range ofCMN noise.
> A: Yes, we take a sum in a group with no hits.
> For the decision of hit channel:
> 1. Loop over all the channels in the group and calculate the mean and RMS 
> for each channel.
> 2. Select the channel with adc < mean + 3.0*RMS and use those channels to 
> calculate the CMN of this group.
>
> > b) There should be a description how many times bins are considered in 
> > calculation, and if pedestal e.g depends on bin or not
> A: for the current DAQ test, we have 9 time bins and the pedestal/CMN 
> should be calculated for each time bin.
>
> > c) How many time bins should be kept?
> A: for IST, there were 4 time bins kept. My guess is the same 4 time bins 
> should be also sufficient for FST.
>
> Best,
>
> Xu
>
>
>
> On Tue, Aug 3, 2021 at 4:40 PM videbaek <videbaek AT bnl.gov> wrote:
>>
>> Hi Xu,
>>
>> I have two questions/comments where you should clarify the algoritm or
>> conditions
>> based on work earlier.
>>
>> a) For the CMN calculation you take a sum in a group over non hit
>> channels?
>> What is the decision for not having a hit? I assume it is adc value of
>> pedestal+some range ofCMN noise.
>>
>> b) There should be a description how many times bins are considered in
>> calculation, and if pedestal e.g depends on bin or not.
>>
>> c) How many time bins should be kept?
>>
>>
>> bet Flemming
>>
>> On 2021-08-03 09:43, Xu Sun wrote:
>> > Hi Tonko,
>> >
>> > We have prepared a document about how to calculate/subtract the common
>> > mode noise in the online ZS DAQ.
>> > Please find it in the following link:
>> > https://drive.google.com/file/d/1qsd1Uy71ARPRlVVw9GImlvAac9rTlxv9/view?usp=sharing
>> > [1]
>> >
>> > Comments and suggestions are welcome.
>> > Please let us know what we could help to implement this to the DAQ
>> > software.
>> >
>> > Best,
>> >
>> > Xu
>> >
>> > Links:
>> > ------
>> > [1]
>> > https://urldefense.com/v3/__https://drive.google.com/file/d/1qsd1Uy71ARPRlVVw9GImlvAac9rTlxv9/view?usp=sharing__;!!P4SdNyxKAPE!SYbPJlMfRzEwwZGlh3SGXO7K5XqueHjMtgCJEi1gh7QjADFyYN-XL6sEjRaU7wrUPtV0C7c$
>> > _______________________________________________
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>>
>> --
>> Flemming Videbaek
>> senior scientist
>> videbaek @ bnl.gov
>> Brookhaven National Lab
>> Physics Department
>> Bldg 510D
>> Upton, NY 11973
>>
>> phone: 631-344-4106
>> cell     :  631-681-1596