[Sbs_gems] [EXTERNAL] Question on pedestal plots

[Sean Jeffas]

Hi Kondo,

For point 2 I noticed that one backplane shifted it's pedestal today which
is why you see that offset. I uploaded a new pedestal today. You should
look at a more recent run, like this one:

https://logbooks.jlab.org/entry/3975713

The distribution for layer 1 is similar to all the UV layers.

Best,
Sean

On Sat, Jan 22, 2022 at 6:59 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
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