[Halld-tagger] [GlueX] EPICS events in data stream

[Richard Jones]

Sascha,

Finding the coh peak position requires considerable analysis, and
polarization fraction even more.  Are you sure you want to do this in
EPICS?  This sounds more like an online monitoring job, writing to a
database.

-Richard J.


On Wed, Jun 25, 2014 at 9:40 AM, Alexander Somov <somov at jlab.org> wrote:

>
> Hi,
>
> >From the Pair Spectrometer we'll record:
> - PS coincidence rate for specific energy bin (lumi monitor)
> - coh peak position
> - polarization fraction
>
> Note, PS has a special trigger type, there will be a lot
> of information available during data reprocessing.
>
> Cheers,
>        Sasha
>
>
> On Tue, 24 Jun 2014, Richard Jones wrote:
>
> > Hello David,
> >
> > For the microscope, I would like to have a set of key voltage levels and
> > temperatures in the frontend recorded in the event stream.
> >
> > -Richard J.
> >
> >
> > On Tue, Jun 24, 2014 at 7:52 AM, David Lawrence <davidl at jlab.org> wrote:
> >
> >> Hi All,
> >>
> >>  One of the features that will be implemented in the online is the
> ability
> >> to insert non-CODA events into the data stream. This would mainly
> include
> >> EPICS variables that might be useful in the offline analysis where the
> full
> >> EPICS archive is not readily available. For example, the electron beam
> >> current or a temperature in the hall. What is needed is a list of the
> EPICS
> >> variables that might have value in the offline and the frequency by
> which
> >> to read and insert them. Realistically, variables cannot be inserted
> more
> >> often than once every 2 seconds. I assume many of these though will not
> be
> >> written more than once per minute. If you know of good candidates of
> >> non-CODA data that should be inserted into the data stream, please send
> >> them to me along with a suggested insertion frequency. I will compile
> them
> >> into a configuration file that will also serve as the official list.
> >>
> >> Regards,
> >> -David
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> >>
> >
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