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

[Richard Jones]

Dave,

This message is just a placeholder, as I don't know yet what the best
format for this information will be (number of bytes, variables to store,
frequency) but I would like there to be a regular storage of the active
collimator beam offsets and total current to 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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