[Sbs_gems] [New Logentry] SBS GEM Latency Scan Results

[Mark Jones]

need to be a little careful since there are a lot of accidentals
if this was with the coincidence and prescaled bbcal trigger.
May need to put a cut on good coincidence.

Cheers,
         Mark
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Subject: [Sbs_gems] [New Logentry] SBS GEM Latency Scan Results

SBS GEM Latency Scan Results<https://logbooks.jlab.org/entry/4061421>

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Lognumber 4061421<https://logbooks.jlab.org/entry/4061421>. Submitted by adr<https://logbooks.jlab.org/user/adr> on Mon, 10/17/2022 - 16:41<https://logbooks.jlab.org/entries?start_date=1666035710&end_date=1666042910&book=HALOG&book=SUPERBIGBITE>.

Logbooks:       HALOG<https://logbooks.jlab.org/book/halog> SUPERBIGBITE<https://logbooks.jlab.org/book/superbigbite>
Tags:   GEM<https://logbooks.jlab.org/tag/gem>
Entry Makers:   adr
References:     4057468 - BB and SBS GEM, MPD trigger time difference = 240 ns = 10 latency units<https://logbooks.jlab.org/entry/4057468>

We found that our guess value for global latency of "102" for SBS GEM latency is correct/very close.

Look at page 3, 3rd raw, 3rd and 4th plots in the attached files. These are max time sample histos for U/X and V/Y strips respectively, for events with track cuts.

At 102 latency -> https://logbooks.jlab.org/files/2022/10/4061348/summaryPlots_1998_sbs_ge...<https://logbooks.jlab.org/files/2022/10/4061348/summaryPlots_1998_sbs_gem.pdf>
At 108 latency -> https://logbooks.jlab.org/files/2022/10/4061354/summaryPlots_1999_sbs_ge...<https://logbooks.jlab.org/files/2022/10/4061354/summaryPlots_1999_sbs_gem.pdf>
At 96 latency -> https://logbooks.jlab.org/files/2022/10/4061357/summaryPlots_2000_sbs_ge...<https://logbooks.jlab.org/files/2022/10/4061357/summaryPlots_2000_sbs_gem.pdf>

At 102 latency, we see a peak is at 5th time sample. At both 108 and and 96, we clearly don't see a distribution and suggests that the latency is off.
We will ideally want to peak at the 4th time sample just like the BB GEMs. So we will decrease the latency by 1 unit and see. https://logbooks.jlab.org/entry/4061417
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