[Tpe] Fwd: Re: simulation

[Larry Weinstein]

Dear TPE Folks,

I need comments ASAP so Dave can order the materials.  There is a long 
lead time for these.

Here are the results of Dasuni's simulations for a) lead vs tungsten for 
a 2 cm radphi-wall collimator, b) lead vs tungsten for the moller 
catcher and c) different diameters for the radphi wall collimator.

Two points about the table:
  1) each line represents the results of 10 million incident electrons.  
You need to average the occupancies for each run type and sum the lepton 
flux (last column).  This was done to gove us a better idea of the 
statistical uncertainties in the results.
  2) When comparing the radphi wall collimator diameters, you need to 
normalize to the lepton flux (last column).

My conclusions:
  1) 2 cm is best for the radphi wall collimator.  1.8 cm is almost as good.
  2) tungsten is much better than lead for the radphi wall collimator
  3) I am not sure whether we need tungsten for the Moller catcher

Please comment ASAP.

- Larry





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