[BTeam] solenoid focusing comparison

[Jay Benesch]

Attached find a comparison of focusing strength vs radius among two of 
my designs and the existing injector solenoids.  Alicia has found that 
the stray field of my design is too great to work with the existing 
chopper solenoid spacing. This is due to precession in the stray field 
combined with the fact that the slits are at different Z locations.

A design with smaller hole in the steel end plates would work per Alicia 
but has intermediate flatness.  Buying enough of these to replace all 
the existing solenoids _and_ the quads in the 0L01-0L03 region would 
cost about $200K.  Two sets of end plates, with small and "optimized" 
holes, could be purchased and swapped if chopper spacing were increased 
by perhaps a meter to accommodate both 200+ kV beam and the better 
solenoids.
-------------- next part --------------
A non-text attachment was scrubbed...
Name: solenoid_compare_plots.pdf
Type: application/pdf
Size: 36731 bytes
Desc: not available
URL: <https://mailman.jlab.org/pipermail/bteam/attachments/20171121/a5fdaea7/attachment-0001.pdf>