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

[Ken Livingston]

Hi David, Richard,
Form the coherent brem perspective, the following would be required at 
2s intervals.
These are not proper names yet

goni_axis 1,2,3,4,5
coh_edge
coh plane
coh radiator

ladder scalers / microscope scalers - possible some scalers from the 
pair spec.

It's the read of the scalers at 2s intervals that enables the coherent 
edge to be reconstructed and tracked.

In hall B, the goni params etc were in a 2s epics event  and TESC, the 
tagger scaler was inserted every 2s as a special bank created from the 
epics waveform array (376 elements).

Regards,
Ken





On 24/06/14 14:38, Richard Jones wrote:
> 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
> <mailto: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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-- 
=======================================================
Ken Livingston

Dept. of Physics & Astronomy,        Tel: +44 141 330 6428
University of Glasgow,               Fax: +44 141 330 5889
Glasgow G12 8QQ.
Scotland. UK.
=======================================================