[Hps] [EXTERNAL] 2021 Event Skimming

[Cameron Bravo]

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>
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>
> *Sent:* Thursday, November 18, 2021 12:35 PM
> *To:* Graf, Norman A. <ngraf at slac.stanford.edu>
> *Cc:* HPS <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>
> 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
>
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>
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