st.steel inserts in collimator cave sweep magnet

[Richard Jones <richard.t.jones@uconn.edu>]

Tim,

I am reviewing the simulation geometry for the collimator cave, and note 
that there are rectangular inserts filling the region between the poles 
of the permanent magnet that serves as sweep magnet number 1.  The 
material for these inserts is stainless steel.  This is quite a lot of 
steel, and plays an important role in stopping fast muons that are 
generated in the primary collimator.  I just wanted to check to make 
sure that these inserts are in the drawings.  They are rectangular and 
come up to the elliptical beam pipe.  The simulation results showed that 
we do not need to worry about filling the corners around the beam pipe; 
just leaving a rectangular hole for the elliptical beam pipe is fine.

-Richard Jones