[Sbs_gems] [EXTERNAL] GEM MPD DAQ - APV hang up issue for January run

[Gnanvo, Kondo (kg6cq)]

Dear Bryan, Ben.

We discussed at the RC meeting yesterday whether MPD readout list could be modified to allow the DAQ to keep on running even if a single APV fail to configure properly at the beginning of a run.

Right now, we have had a lot of occurrence where one APV failure cause an MPD / fiber link error that a shift crew can not really debug or fix. A GEM or DAQ expert will ultimately be called and it would results to this APV been disabled. This usually results in a lot of wasted beam time during the shift without even fixing the APV problem.

So it will be more efficient if the APV25 configuration fail is ignored and allow the DAQ to continue with some warning that will allow the shift crew to alert the GEM expert who can take a look at the issue when there is an opportunity. This way, there is no beam time lost.

Maybe the DAQ configuration will be allow to crash only if a number of APV25 (that we decide on, maybe 3 or 5 …), or all APVs on a backplane or MPD  all fail to configure which would indicate a more serious problem.

I was wondering if it is possible to implement such scheme in the MPD readout list

Best regards
Kondo



From: Sbs_gems <sbs_gems-bounces at jlab.org> On Behalf Of Holly Szumila-Vance
Sent: Monday, December 20, 2021 4:12 PM
To: sbs_gems at jlab.org
Subject: [Sbs_gems] No SBS GEM meeting on Wednesday this week

Dear all,

There will be no SBS GEM meeting this Wednesday. Please look for updates by e-mail.

Enjoy the holidays, and see you in the New Year!

-Holly
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://mailman.jlab.org/pipermail/sbs_gems/attachments/20211221/b7917a5b/attachment-0001.html>