[Hps] HPS is taking data

[Kyle McCarty]

Hello Volker,

Clusters, in the hardware at least, are defined using a 3 x 3 window around
a central highest-energy hit. Essentially, the GTP clusterer finds a
crystal that is a local maximum and then declares it, along with the 8
crystals around it, to be a cluster.

- Kyle

On Sat, Dec 13, 2014 at 2:14 PM, burkert <burkert at jlab.org> wrote:
>
> Hi all,
>   Congratulations to starting the real data taking!
>
> I have a question on the single cluster energy spectrum. I would expect
> that single clusters at forward angles should have a peak at nearly the
> full beam energy from quasi-elastic ep scattering minus the platinum
> binding energy, and at very-very forward angles from e-PT -> e-PT
> elastic scattering. The peak sits however at much lower energy , which
> may indicate incorrect energy calibration, or the energy in the cluster
> is not completely summed up.
> My question is, how many crystals are summed up to define an energy
> "cluster"?
>
> Volker
>
>
>
> On 12/13/14, 11:05 AM, Maurik Holtrop wrote:
> > Hello Takashi, Stepan and all of you on shift,
> >
> > This is really great!
> >
> > I went through the logbook entries and don't see the entry that explains
> what the source of background was and how it was eliminated. If you have a
> moment, could you please point me to the right entry? Was it beam-gas
> interactions?
> >
> > Best,
> >       Maurik
> >
> >
> > On Dec 12, 2014, at 8:39 PM, Maruyama, Takashi <tvm at slac.stanford.edu>
> wrote:
> >
> >> With heroic effort by Stepan, the anomalous source of background was
> identified and eliminated completely. 1.5 micron-thick Pt target was
> inserted. Attached is a ECal single rate map at 10 nA. This is very similar
> to what you see in Monte Carlo.
> >>
> >> Ben has setup a very loose two cluster trigger and Sergey's DAQ system
> is taking data at 4.5 kHz at 10 nA. This data will be used to find optimum
> cuts for pair trigger.
> >>
> >> Takashi
> >> RC <fadc_firsttarget.png>_______________________________________________
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> >> Hps at jlab.org
> >> https://mailman.jlab.org/mailman/listinfo/hps
> >
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