[Halld-tagger] gluex radiator

[Richard Jones]

Paul,

Not yet, but I will make it an agenda item for our next working group 
meeting, scheduled for a week from today.  Thanks for bringing this to 
my attention.  If you need something in the mean time, you can state 
that we have two needs for disordered radiators.

   1. For endpoint running, esp. the Primex measurement in which having
      a bremsstrahlung target that behaves like an atomic scatterer
      (Bethe-Heitler) without CB corrections makes computing and fitting
      the endpoint spectrum much simpler.
   2. For setting up and commissioning the beam line and tagger, we will
      certainly want a small array of targets with different
      thicknesses, in order to be able to distinguish different
      contributions to the background in the tagger, and also to be able
      to study how the tagging efficiency depends upon electron beam
      current.  The latter point is related to variations in beam shape
      and motion that are seen as the S/N in various electron beam
      control loops improves with increasing beam current.

For item #2, we will want 2-3 radiators with different thicknesses that 
vary by factors of 3-10.  For item #1, we will ask the Primex team to 
specify what they want to see.  They may be content with one of the 
radiators we specify for item #2, but we will leave that up to them.

-Richard Jones

-Richard J.

On 6/21/2010 11:42 AM, Paul Eugenio wrote:
> Richard,
>
> Are there any write up on plans for non-diamond radiators?  I would like to put some description other than a single line in the MOU stating that FSU will provide access to its thin-foil target making facility.
>
>
> Paul
>
>
>
> --
> Prof. Paul Eugenio
> Florida State University
> Department of Physics
> Tallahassee, Florida,  USA 32306
>
> (850) 644-2585
> eugenio at fsu.edu
>
>
>    

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