[Rgc] [EXTERNAL] check of runs in low-PF epochs

[Nilanga Wickramaarachchi]

Hi Sebastian,

Just for confirmation, are the equations for NH3 packing fraction and dilution factor (eqn. 11 and 13) also different in the new version of note (v 2.7) compared to previous versions?

Thank you,
Nilanga Wickramaarachchi
________________________________
From: Sebastian Kuhn via Rgc_analysis <rgc_analysis at jlab.org>
Sent: Saturday, February 7, 2026 10:29 AM
To: Hector Almanzor Chinchay Espino <HectorAlmanzor.ChinchayEspino at unh.edu>
Cc: rgc at jlab.org <rgc at jlab.org>; rgc_analysis at jlab.org <rgc_analysis at jlab.org>
Subject: Re: [Rgc_analysis] [EXTERNAL] [Rgc] check of runs in low-PF epochs

Thank you for pointing this out. I updated the file again (v. 2.7) - hopefully now it is correct. (You may have to reload the Wiki page https://clasweb.jlab.org/wiki/index.php/Run_Group_C_Group_Meetings to get the updated link).

- Sebastian

On Feb 7, 2026, at 02:42, Hector Almanzor Chinchay Espino <HectorAlmanzor.ChinchayEspino at unh.edu> wrote:

Hello Sebastian,

Thanks for the updates, I saw a possible typo in this updated tech note in the equation of PF for ND3  (equation 15), I guess n_A should not be in the denominator in this case. Please, could you confirm this? thank you

Best,

Hector
________________________________
From: Sebastian Kuhn via Rgc_analysis <rgc_analysis at jlab.org<mailto:rgc_analysis at jlab.org>>
Sent: Friday, February 6, 2026 16:15
To: Silvia Niccolai <silvia at jlab.org<mailto:silvia at jlab.org>>
Cc: rgc_analysis at jlab.org<mailto:rgc_analysis at jlab.org> <rgc_analysis at jlab.org<mailto:rgc_analysis at jlab.org>>; rgc at jlab.org<mailto:rgc at jlab.org> <rgc at jlab.org<mailto:rgc at jlab.org>>
Subject: Re: [Rgc_analysis] [Rgc] check of runs in low-PF epochs


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Dear RG-C analyzers,

I updated the tech note on dilution factor calculations based on data - see our Wiki page https://clasweb.jlab.org/wiki/index.php/Run_Group_C_Group_Meetings
I found a typo that affected the ND3 results, and I simplified all numerical expressions so they look more reasonable (and comparable to each other). Please check if you see any mistakes, and - if possible - re-calculate thePF and DF for your favorite channel and epoch using the PF method, preferably for both NH3 and ND3, but especially the latter.

Thanks, and happy weekend - Sebastian

On Jan 27, 2026, at 13:53, Silvia Niccolai via Rgc <rgc at jlab.org> wrote:

Dear all,
Following today's discussion, I contacted Chris to try and understand the ~10% differences that Hector observed in the PF for some ND3 epochs.
Chris suggested me to look at the raster distributions, so I went back to the Elog to retrieve the raster monitoring plots, and the results are in the attached slide. It seems like there is some vertical "sagging" of the material for the runs in the epochs having lower PF.
Best regards,
Silvia

<pf_differences_explanation.pdf>_______________________________________________
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