[Sbs_gems] [EXTERNAL] Question on pedestal plots

[Sean Jeffas]

Hi Kondo,

I'm not sure if you found this, but I made a log post with the GEM study,
which will be most useful to you.

https://logbooks.jlab.org/entry/3975518

Best,
Sean

On Sun, Jan 23, 2022 at 11:34 AM Gnanvo, Kondo (kg6cq) <kg6cq at virginia.edu>
wrote:

> Hi again Andrew,
>
>
>
> I just quickly looked at the GEM studies with beam current from yesterday
> and it seems that the sag is indeed correlated to the beam current. I will
> try to get some preliminary plots on that shortly
>
>
>
> Best regards
>
> Kondo
>
>
>
> *From:* Andrew Puckett <puckett at jlab.org>
> *Sent:* Saturday, January 22, 2022 7:28 PM
> *To:* Gnanvo, Kondo (kg6cq) <kg6cq at virginia.edu>
> *Cc:* Sbs_gems at jlab.org
> *Subject:* Re: [EXTERNAL] Question on pedestal plots
>
>
>
> Hi Kondo, We’ve seen this phenomenon since the beginning of the
> experiment, it was worse for high Q2 kinematics. The negative sag of the
> common mode for either method  is attributable to the wrong polarity
> fluctuations. The difference between Danning and sorting method
> calculations is something we’ve also seen from the beginning. The Danning
> method as implemented offline is subject to more downside bias as a result
> of this compared to the sorting method. I suppose if we see a larger
> difference in some modules it could affect the efficiency, but is hopefully
> correctable in software.
>
>
>
> Andrew
>
> puckett.physics.uconn.edu
>
>
>
> On Jan 22, 2022, at 6:58 PM, Gnanvo, Kondo (kg6cq) <kg6cq at virginia.edu>
> wrote:
>
> 
>
> Hi Andrew,
>
> I was looking at some pedestal plots and I noticed two things,
>
>
>
> 1-) The difference between sorting and Danning method has this curve-like
> shape for the U-V strip layer that is not seen for the X-Y layers and the
> difference is quite significant compare to the common mode fluctuation
> itself. I looked at some earlier plots (run 13394) when we had all 4 U-V
> layers as well as the most recent one and it seems quite consistent.
>
>
>
>
> https://logbooks.jlab.org/files/2022/01/3975625/summaryPlots_13455_BBGEM_ped_and_commonmode_50k_printme.pdf
>
>
>
>
> https://logbooks.jlab.org/files/2022/01/3974078/summaryPlots_13394_BBGEM_ped_and_commonmode_50k_printme.pdf
>
>
>
> 2-) I also see for the V stripe of layer#1, the difference is more
> pronounced and I am thinking this might partly explain the lower efficiency
> we are seeing with this layer
>
>
>
> I was wondering if there is any explanation for the discrepancy. Maybe
> there is something here that we can learn something from
>
>
>
> Best regards
>
> Kondo
>
> _______________________________________________
> Sbs_gems mailing list
> Sbs_gems at jlab.org
> https://mailman.jlab.org/mailman/listinfo/sbs_gems
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://mailman.jlab.org/pipermail/sbs_gems/attachments/20220123/b6986e63/attachment.html>