[Halld-tagger] Photon spectrum question

[Alexander Somov]

Hi Michael,

Below are some numbers you can use to quickly estimate
the photon flux.

The flux of uncollimated photons (for high-lumi runs):
------------------------------------------------------
11   GHz  at the photon cut off energy 0.12 GeV
22.4 GHZ  at                           0.0012 GeV

You can find the flux dependence on the threshold in

https://halldweb1.jlab.org/wiki/index.php/HOWTO_to_generate_electromagnetic_background

----

The 3.4 mm collimator reduces the total photon flux
(integrated above the low-energy thresholds) by about a factor of 
6.5 - 7.

You can use the post collimated photon spectrum and these numbers
to estimate/simulate the photon flux.


Cheers,
        Alex





On Wed, 25 Jan 2012, Michael Dugger wrote:

>
> Hi,
>
> I would like to get an estimate of the expected photon spectrum. I need
> the photon rate and expected polarization as a function of energy. Any
> assistance is appreciated.
>
> Thanks for your time.
>
> Sincerely,
> Michael
>
>
> _______________________________________________
> Halld-tagger mailing list
> Halld-tagger at jlab.org
> https://mailman.jlab.org/mailman/listinfo/halld-tagger
>