[Sbs_gems] [EXTERNAL] BB cosmic results

[Andrew Puckett]

Hi Sean,

I posted a follow-up comment to your logbook entry. I suspect that you probably had the calorimeter-based search-region constraint enabled during your analysis and that is probably why you see very few tracks. That constraint is only appropriate for electrons in BigBite coming from the target with magnet fully energized. It is designed to speed up the tracking analysis under beam conditions.

If you set

bb.gem.useconstraint = 0

in the database, the code will look everywhere for tracks. Having said that, some of the low-level plots look a bit screwy as far as the ADC distributions. Not clear if zero suppression is configured/working properly. Need new pedestals and common-mode files, perhaps?

Andrew

From: Sbs_gems <sbs_gems-bounces at jlab.org> on behalf of Sean Jeffas <sj9ry at virginia.edu>
Date: Thursday, November 4, 2021 at 10:37 AM
To: sbs_gems at jlab.org <sbs_gems at jlab.org>
Subject: [Sbs_gems] [EXTERNAL] BB cosmic results
Hi All,

I have finished analyzing the 10M event cosmic run taken yesterday. Please see the results in the logbook, https://logbooks.jlab.org/entry/3936858. Notably there seem to be barely any tracks. Maybe the magnet incident has seriously thrown off the tracking? Perhaps Andrew could comment. But if we look at the plots without tracking we see typical ADC and strip distributions for all GEMs. The scale on some of the plots is a bit too large because it is typically meant to show production data. However from what I see everything looks normal to me. Let me know if you want me to touch up the plots a bit, to make things more clear.

Best,
Sean
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