[Halld-offline] Commissioning beam spectrum

[Richard Jones]

Hello Sean and all,

The most convenient way to parameterize the amorphous spectrum is to use
the diamond spectrum rotated away from coherent bremsstrahlung alignment.
 Here is how to do that with HDGeant.

In the control.in file:

   - find the line that says, "BEAM 12.0 9.0" and change it to "BEAM 12.0
   11.9"
   - make sure that the BEAM card is not commented out, otherwise it is
   ignored.

That will generate an incoherent bremsstrahlung spectrum, what would be
obtained from an amorphous radiator.

-Richard J.


On Thu, Feb 13, 2014 at 6:47 PM, Sean Dobbs <s-dobbs at northwestern.edu>wrote:

> Hi all,
>
> This question came up at our discussion of event rates at the calibration
> meeting yesterday, but is there some parameterization of the photon
> spectrum expected from the radiator that we are going to be using for the
> commissioning run?
>
>
> Cheers,
> Sean
>
>
> --
> Dr. Sean Dobbs
> Department of Physics & Astronomy
> Northwestern University
> phone: 847-467-2826
>
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