[PEPPo] modified solenoid

[Jay Benesch]

Colleagues,

I modified the model presented today.  Coil 50 cm, steel 15 cm section, 
3 cm gaps between coil and steel for water and current connections on 
the ends.  1 cm gap between OD of coil and ID of steel.  Steel end IR 
22.5 cm and 25 cm to leave room for either 2.5 cm or 5 cm of W10Cu 
inside the steel so it need not be cooled as the W10Cu must be.  I 
varied current density around the values presented by Andriy.  Base 
value is 1000 A/cm^2.  Drive values on graphs are multipliers of that.

Andriy: I can provide field maps for any or all of these.

Jay
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