[Crater-team] CRaTER Side Shielding

[Harlan Spence]

I love it when a plan comes together.  We meant to do that!  I guess it was in the instrument paper for a reason….too many years now.
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Harlan E. Spence
Director, Institute for the Study of Earth,
   Oceans, & Space and Prof. of Physics 
Morse Hall, Room 306 
University of New Hampshire
8 College Road
Durham, NH 03824-3525

Phone: 603-862-0322
Fax:   603-862-1915

http://www.eos.unh.edu/Faculty/Spence
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> On Dec 6, 2018, at 2:36 PM, Anthony Case <tonycase at cfa.harvard.edu> wrote:
> 
> Since we were discussing the possibility of side-penetrators yesterday, I went back and looked at the solid model for the instrument to see how much shielding is on the sides of the detectors.  There are a couple images attached.  The outer wall of the telescope housing is 0.2 cm, and the added shielding was essentially a C-channel with 0.2cm walls that was bolted onto the outside of the telescope housing.  So for normally incident particles there is just the end-caps which are 0.076 cm (which gives us our usual ~10-12 MeV protons required to get into the instrument).  And for side-penetrators to get through a 0.4cm thick wall requires about 27.5 MeV.  That neglects the detector frame, which could add another >0.5 cm.  Of course any particular particle's path through all of this junk is fairly complex, but roughly speaking 30-50 MeV seems like the minimum energy a side-penetrating proton would need to reach the detector.
> 
> <image.png>
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> <image.png>
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> 
> ---------------------------------------------------------------------
> Anthony Case
> Astrophysicist
> High Energy Astrophysics Division (HEAD/SSXG)
> Center for Astrophysics | Harvard & Smithsonian
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