-------- Original Message --------
Subject: Z Force on solenoids
Date: Mon, 04 Jun 2001 07:39:52 -0700
From: Michael Barnes 
Reply-To: michael.barnes@triumf.ca
Organization: TRIUMF
To: Nathan Rodning 
CC: John Macdonald , Ewart Blackmore


Hi Nate,

I final update, before we head off,  re the forces in the Z direction on
the coil former. I ran the analysis  with a +0.5cm displacement in Z at
245A (full current). Although the analysis is not yet complete I ordered
the calculation of coil forces such that the coils with the largest
individual forces (#11, #12, #5 & #6) are calculated first (based on
experience with analyses at 114A). The analysis has calculated the
forces on the following coils:
#11    -1,0987,876 N
#12    +1,090,982 N
#5      -947,044 N
#6     +949,787 N
#3    -118,736 N
#4    +119, 117 N
#1     +535 N
#2    -317 N
Sum => 6448 N

For the 114A analysis, at 0.5cm, the above coils contributed 84.1% of
the net force on the former. Therefore I would anticipate a net
predicted force in the Z direction of 7670 N at 245A, with a +0.5cm
displacement (NOTE: this net force is only 0.7% of the individual force
on coil #11).
The equivalent force at 114A, and +0.5cm displacement, was 4717 N.
Therefore, although the net force has increased, the increase is only
63%, and is considerably less than I estimated from current^2.
Interestingly though the Z force on coil #11 has increased by a factor
of 5.17, and the force on coil #12 by a factor of 5.14 (current^2 is
4.63). Therefore I would not be surprised if the net force is in error
because it is determined by the difference of some very large numbers.

Cheers,
Mike

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