[Halld-cal] Added angular plots for pi0s

[Richard Jones]

Will,

We are able to tag down as far as 3 GeV using the fixed array, although at somewhat reduced intensities.

-Richard J.


On 2/11/2011 7:38 AM, Will Brooks wrote:
> Dear Elton,
>
>    Very nice plots!
>
>    One might argue that if no photons go at large angles for
> calibrations, they won´t go there either for the measurements you´re
> interested in. But in the interests of calibrating the detector as well
> as possible, it might be interesting to explore different approaches,
> such as using a lower beam energy. Do we know how low the beam energy
> could go? Also, one could run untagged and just make a very large number
> of pi-0's, so the back angles would be more populated, but there may be
> other issues in that case, e.g., tagger beam dump current limit,
> radiation dose limits, etc.
>
> Thanks,
>
>    - Will
>
>
>
> On 2/10/11 8:04 PM, Elton Smith wrote:
>> Dear collaborators,
>>
>> Will suggested I look at plots of the angular distribution of pi0s, as
>> it likely varies considerably over the length of the bcal. I added two
>> plots of the angular distributions to GlueX-doc-1702, for two different
>> photon energy thresholds (0.2 and 0.5 GeV). As expected, the
>> distributions are quite steep. It is likely that the calibrations will
>> be limited for angles beyond about 50 degrees. Of course this can be
>> looked at more quantitatively.
>>
>> Cheers, Elton.
>>
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