SNAP Shield Group Meeting  May 7, 2003
                        Dejongh, Diehl, Kerby, Page  


 Next Meeting
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 Please note the change in meeting-week phase.

 May 14th, 2003 IB1 2nd floor West 10:00-11:00 AM.  This will continue
 over into the Instrument Meeting by phone link with LBL. 
  
 Mechanical Engineering
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 Tom Peterson (in absentia) reported that he will have an update of the 
 satellite major materials list pending one more round of conversation
 with Robin Lafever.

 There was discussion of the problem of automatic production of a 
 table of material as a function of position from the solid model.
 Tom Page and Jim Kerby will attempt to make a table of material 
 subtended by the intersection of a small, narrow cylinder (eventually
 suitable for a grid) and/or a spherical section around a point on the 
 cold plate. Some interesting ideas about how to use the "spotlight"
 capabilities in the software might also prove useful to understand 
 where the material (g/cm^2) is thin. 
   Fritz has a contact at Goddard who used a program "Novice" to solve
 this kind of problem. He will follow that up.

 Tom Pa. has been looking at shielding around the spectrograph. Fritz
 Dejongh suggested that mechanical constraints (weight, etc ...) will restrict 
 it to be small and localized.

 Shielding Simulation
 --------------------
 Fritz provided code to normalize the primary proton flux generator
 Tom D. described 2 weeks ago. It also starts the protons on the 
 surface of a cube and gives them an initial direction. Tom D. included 
 that in the generator.  HTD will produce a spherical-geometry normal-
 ization and also start on the helium spectrum.