[Halld-tagger] Microscope coverage

[Richard Jones]

Alex and all,

The microscope should extend some distance above the coherent edge so as to have as continuous as possible a measurement the peak region, for the sake of systematics in the CBSA extraction of polarization.  However the fixed array can easily provide 100% coverage above 9 GeV, whereas there are rate problems trying to do the same thing with fixed array counters on the low side of the peak.   In light of this, here are some trial concepts to consider.

 1. 100 energy bins in the microscope: 8.15 - 9.10 GeV
 2. 120 energy bins in the microscope: 7.96 - 9.10 GeV
 3. 150 energy bins in the microscope: 7.68 - 9.10 GeV

-Richard Jones


On 10/18/2012 6:18 PM, Alexander Somov wrote:
> Hi,
>
> One thing we have to discuss regarding the final
> microscope location. We've already started discussing
> this long time ago.
>
> To cover the photon energy range between 8.3 GeV and
> 9.1 GeV we will need about 78 columns of microscope
> counters. The energy range per counter is ~ 10 MeV.
>
> The microscope consists of 100 columns so that it should
> cover about 200 MeV larger range. I think that we should
> 'distribute'  this 200 MeV equaly for both low- and
> high- energies, i.e., to cover the range
> 8.2 GeV < E_gamma <  9.2 GeV.
>
> Any suggestions ?
>
>
> Thanks,
>          Alex
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> Halld-tagger at jlab.org
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