[Hps] [EXTERNAL] 2021 Event Skimming

[Valery Kubarovsky]

Faraday cup signal is in bit 15 (starting from 0) of so called Front panel of the TS board.
That is what Cameron called "ext word". This signal has prescale as well.
Faraday cup rate is proportional to the beam current that is important to for the background merging.
Pulser has 100 Hz rate independently of the beam current. It couts without beam as well.

________________________________
From: Hps <hps-bounces at jlab.org> on behalf of Cameron Bravo <cbravo135 at gmail.com>
Sent: Thursday, November 18, 2021 16:00
To: Graf, Norman A. <ngraf at slac.stanford.edu>
Cc: HPS <Hps at jlab.org>
Subject: Re: [Hps] [EXTERNAL] 2021 Event Skimming

Hi Norman,

The trigger supervisor (TS) provides two words of trigger bits, documented as the "prescaled word" and the "ext word".
The trigger bit you have referred to thus far are all in the "prescaled word", so the pulser trigger is bit 15 of the prescaled word.
The random trigger bit is bit 15 of the "ext word".

Cheers,
Cameron

On Thu, Nov 18, 2021 at 12:43 PM Graf, Norman A. <ngraf at slac.stanford.edu<mailto:ngraf at slac.stanford.edu>> wrote:

Hi Cameron,



Thank you for your request.



Pulser corresponds to trigger #15.



Which trigger is the random trigger?



Norman



From: Cameron Bravo <cbravo135 at gmail.com<mailto:cbravo135 at gmail.com>>
Sent: Thursday, November 18, 2021 12:35 PM
To: Graf, Norman A. <ngraf at slac.stanford.edu<mailto:ngraf at slac.stanford.edu>>
Cc: HPS <Hps at jlab.org<mailto:Hps at jlab.org>>
Subject: Re: [Hps] [EXTERNAL] 2021 Event Skimming



Dear Norman,



A reminder that we also agreed during the collaboration meeting to include both the random trigger and pulser trigger bits in this skim.



Thanks,

Cameron



On Thu, Nov 18, 2021 at 12:25 PM Graf, Norman A. <ngraf at slac.stanford.edu<mailto:ngraf at slac.stanford.edu>> wrote:

Dear Colleagues,



As we discussed at the collaboration meeting, we would like to start skimming selected events from the 2021 run based on their triggers. Since this will involve staging roughly 1PB of data and processing all the files we would like to include all the triggers that we envision being needed for calibration or other purposes, while still keeping the resulting skimmed files to a reasonably small fraction of the data. We currently plan to skim the following triggers:



00 Moller Top

01 Moller PDE Top

04 Moller Bottom

05 Moller PDE Bottom

09 Moller pair

11 Pair-3 (mu+mu-)

18 FEE Top

19 FEE Bottom



This is expected to be roughly 5% of the data and will be used primarily for calibration purposes.



Please let us know right away if a trigger that you need is being overlooked in this list as we would like to begin this process as soon as possible.



For reference, here is a screenshot from one of our later production runs at 3.7GeV:



https://logbooks.jlab.org/files/styles/plentybig/public/2021/11/3935946/clonsl1_20211102_100806.gif



Thank you,

Norman

_______________________________________________
Hps mailing list
Hps at jlab.org<mailto:Hps at jlab.org>
https://mailman.jlab.org/mailman/listinfo/hps
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://mailman.jlab.org/pipermail/hps/attachments/20211118/c02c3fa0/attachment-0001.html>