[Halld-cal] [EXTERNAL] Re: CPP/NPP BCAL calibration status

Tue Jun 13 03:08:54 EDT 2023

Thank you, Stjepan. Zisis & CAL experts what are your inputs?

tks ig.
________________________________
From: soy062 <soy062 at uregina.ca>
Sent: Monday, June 12, 2023 1:38 PM
To: Igal Jaegle <ijaegle at jlab.org>
Cc: Karthik Suresh <ksv656 at uregina.ca>; Mark Macrae Dalton <dalton at jlab.org>; Rory Miskimen <miskimen at physics.umass.edu>; Zisis Papandreou <zisis at uregina.ca>
Subject: Re: [EXTERNAL] Re: CPP/NPP BCAL calibration status

Hello Igal,

I looked at the layer 3 plots, and indeed, they don't seem to be
converging. Even the fits in the 2y reconstructed mass look very weird
and don't seem to improve per iteration. This is probably very closely
related to the aforementioned issues with Layer 3. Usually I've never
seen this behaviour for the background and total fits, as things looked
rather clean for other experiments (see attached Be target from PrimEx).

Also, looking at the coefficient of variation vs. iteration plot, there
is a big drop in the last iteration, which doesn't really reflect in the
other plots (it's essentially zero), so I'm not sure why that happened.
Currently, I'm not sure what advice to give for layer 3, since it seems
to be a complexity related to the CPP/NPP experiment conditions. Maybe
someone can give additional comments on this.

Best regards,
Stjepan

On 2023-06-10 10:47, Igal Jaegle wrote:
> Thank you, Karthik, for your input. Ok, the 12th iteration finished
> this morning, layer 1 and 2 did converge although their bands seems
> larger than what you are usually showing. The 3rd layer is all over
> the place because no pi0 resonance is seen, look at
> l3_gain_checking_1.py. What is your advice in this case?
>
>  tks ig.
>
> -------------------------
>
> From: Karthik Suresh <ksv656 at uregina.ca>
> Sent: Friday, June 9, 2023 11:45 PM
> To: Igal Jaegle <ijaegle at jlab.org>
> Cc: soy062 <soy062 at uregina.ca>; Mark Macrae Dalton <dalton at jlab.org>;
> Rory Miskimen <miskimen at physics.umass.edu>; Zisis Papandreou
> <zisis at uregina.ca>
> Subject: Re: [EXTERNAL] Re: CPP/NPP BCAL calibration status
>
> Good evening Igal,
>
> The current procedure is such that the convergence could be slow (due
> the the iterative nature). Also, I doubt if  the third layer can be
> calibrated within 1% precision with this method. But I think we could
> conclude that after a few more iterations.
>
> Thank you
> Karthik Suresh
>
> On 2023-06-09 21:26, Igal Jaegle wrote:
>> Thank you, Stjepan, for your answer and help. It seems very slowly
>> converging, see the latest report 8. The first values were not so
> bad,
>> then I did a mistake in the new gain calculation, correct it, then
> it
>> seems to slowly recover but very slowly.  Could it be due to the 3rd
>> layer seeing no pi0s? What should be done to the 3rd layer, put
>> default values or the values of the run period precede it or succeed
>> it? What is your suggestion for the 3rd layer?
>>
>>  tks ig.
>>
>> -------------------------
>>
>> From: soy062 <soy062 at uregina.ca>
>> Sent: Friday, June 9, 2023 10:56 PM
>> To: Igal Jaegle <ijaegle at jlab.org>
>> Cc: Mark Macrae Dalton <dalton at jlab.org>; Rory Miskimen
>> <miskimen at physics.umass.edu>; Zisis Papandreou <zisis at uregina.ca>;
>> Karthik Suresh <ksv656 at uregina.ca>
>> Subject: [EXTERNAL] Re: CPP/NPP BCAL calibration status
>>
>> Hi Igal,
>>
>> Sorry for the delayed response. The histograms in the "fit" ROOT
> file
>> are arranged in a cyclical way. For example, starting from 1 to 4
>> (channel number) would be layer 1, 5 to 8 would be layer 2, 9 to 12
>> would be layer 3, 13 to 16 would be layer 4 and then for 17 to 20 we
>> go
>> back to layer 1. The final one is 763.
>>
>> Looking at the plots (pi0gainmatrix.pdf), there seems to be
> something
>> missing in the pipeline. Basically for each iteration the pi0 mass
> is
>> not converging, which means that somewhere along the way the local
>> ccdb
>> gain constants are not getting updated after each iteration or the
>> local
>> ccdb is not getting copied to the right location. This can be seen
> for
>>
>> example in the sigma/mean vs iteration plot, it is constant, which
> it
>> should not be.
>>
>> Best regards,
>> Stjepan
>>
>> On 2023-06-09 16:45, Igal Jaegle wrote:
>>> Bump!
>>>
>>> -------------------------
>>>
>>> From: Igal Jaegle
>>> Sent: Thursday, June 8, 2023 9:20 PM
>>> To: Mark Macrae Dalton <dalton at jlab.org>; Rory Miskimen
>>> <miskimen at physics.umass.edu>; Zisis Papandreou <zisis at uregina.ca>;
>>> Karthik Suresh <ksv656 at uregina.ca>; Stjepan Orešić
>>> <soy062 at uregina.ca>
>>> Subject: CPP/NPP BCAL calibration status
>>>
>>>  All,
>>>
>>>  I am testing the upgrades of the BCAL gain calibration procedure.
>> The
>>> upgrades free the calibrator of all interventions between each
>>> iteration making the calibration fully automized. I made a wiki
>> which
>>> can be accessed from
>>> https://halldweb.jlab.org/wiki/index.php/Main_Page [1] go to,
> Barrel
>>> Carolimter, pi0 gain calibration, and CPP/NPP (2022-05) BCAL pi0
>>> calibration [2]
>>>
>>>  The report and individual fit can be found here:
>>> https://halldweb.jlab.org/primexd/bcal-cal/2022-05/1/ [3]
>>>
>>>  Stjepan/Karthik, how the layer ordering is working? 1 to 512 first
>>> layer, 513 to 1024 2nd layer, and 1025 to 1534 3rd layer? The 3rd
>> sees
>>> nothing is that an issue? How to solve it? Or leave with it?
>>>
>>>  tks ig
>>>
>>>
>>>
>>> Links:
>>> ------
>>> [1] https://halldweb.jlab.org/wiki/index.php/Main_Page
>>> [2]
>>>
>>
> https://halldweb.jlab.org/wiki/index.php/CPP/NPP_(2022-05)_BCAL_pi0_calibration
> [1]
>> [1]
>>> [3] https://halldweb.jlab.org/primexd/bcal-cal/2022-05/1/
>>
>>
>> Links:
>> ------
>> [1]
>>
> https://halldweb.jlab.org/wiki/index.php/CPP/NPP_(2022-05)_BCAL_pi0_calibration
> [1]
>
> --
> Karthik Suresh
>
>
> Links:
> ------
> [1]
> https://halldweb.jlab.org/wiki/index.php/CPP/NPP_(2022-05)_BCAL_pi0_calibration
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