sPHENIX EMCal discussion

[John Haggerty <haggerty AT bnl.gov>]

Martin,

Thanks!  I think it would be nice to use the events in those data to 
project the beam spot to the front face of our detector.  I suspect that 
a mean and sigma in x and y projected to the front face of the EMCAL 
will give us an idea how much the beam is moving around.  I think we can 
adapt Mickey or Ewa's software to do this.

On 4/16/16 3:55 AM, Martin Purschke wrote:
> Dear test beam aficionados,
>
> as of Friday, we are recording the data from the wire chambers as
> separate (but run-number-matching) data files.
>
> These are NOT the exact same events sphenixdaq is triggering on; we just
> record the data from the chambers while we are taking data.
>
> The way this works is that the main DAQ, in its begin-run, sends a
> daq_begin with its own run number to another rcdaq instance which then
> records the MWPC data. When the main DAQ ends a run, it sends daq_end to
> its partner.
>
> As of now, it will not help with event-by-event information, although
> tomorrow I will see if we can actually trigger the chambers with our
> accepted trigger signal. As it is, it can give you an idea how wide the
> beam spot is.
>
> It's getting late; more details to tomorrow.
>
> The 2nd DAQ instance is running on the hcaldaq machine. It is best to
> leave this one alone and let it do its thing (we have to restart it if
> hcaldaq gets rebooted). It runs out of /home/phnxsa/mwpc and gets
> started with "sh rcdaq_mwpc.sh". The data go to /data/phnxsa/mwpc/.
>
> I attach a picture from run 2209 to show that it works.
>
> Best,
>         Martin
>
>
>
> This body part will be downloaded on demand.


--
John Haggerty
email: haggerty AT bnl.gov
cell: 631 741 3358