-------- Original Message --------
Subject: One final thought re Z forces
Date: Mon, 04 Jun 2001 08:29:26 -0700
From: Michael Barnes 
Reply-To: michael.barnes@triumf.ca
Organization: TRIUMF
To: Nathan Rodning 
CC: John Macdonald , drgill@triumf.ca,Ewart
Blackmore 

Hi Nate,

I took another quick look at the predicted Z force at 114A and 245A. I
noticed the following:
At 114A
coil#11+coil#12 => 1930N (40.9% of net force of 4717N)
coil#5+coil#6=> 1663N (35.8% of net force of 4717N)

At 245A
coil#11+coil#12 => 3106N (40.5% of 7667N)
coil#5+coil#6=> 2743N (35.6% of 7667N)

The percentage contribution of coil pairs to the net force is
approximately constant; this makes sense to me. In addition saturation
effects in the iron would tend to reduce the total force relative to
that expected by extrapolating from lower current levels, so it makes
sense that the force at 245A is less than the 21,850 N I extrapolated
for a +0.5cm displacement. Having said that I would allow for a
considerable safety margin relative to the predicted forces (mechanical
Engineers often allow a factor of 5 !).

My families waiting to leave (having delayed the departure by 24 hours
so that I could do a few more calculations!), so I had better get ready
to go.

Cheers,
Mike

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