As Mike has pointed out, one parameter about which we seem to know very little in
this is the composition of the magnet steel. Earlier calculations from the Don Lobb
era indicated that we did not need to specify low-carbon magnet steel. From the
steel quotes, we specified A1S1 1010 YR 91, whatever that means. Naively, these
results might indicate that our steel is of lower quality (in terms of magnet iron)
than is assumed in Mike's calculations. It's comforting to see that this works in
our favour. Perhaps  this conjecture can be explored quantitatively?

           John

Nate Rodning wrote:

> Hi all-
>         Mike Barnes has sent me his Opera 3d calculations, and Glen has sent me
> the field measurements.  I have played with the plotting scales, and
> find a pretty interesting result.
>         When the measurements and calculations are plotted for 144 A, the
> results agree very well at z=0 without any fudge factor.  As Mike has
> pointed out, the lobes are smaller in the measurements, indicating that
> saturation is setting in sooner than expected.
>
>         At 228A, the field is 3.7% less than expected.  It appears that this is
> because saturation is setting in.  Indeed, the lobes are again smaller
> than expected - which means that the field is flatter than expected!
>
>                                 nate
> --
>
> Nathan Rodning
> Professor of Physics, University of Alberta
> **** 2001/02 at TRIUMF:  (604) 222-7549
> **** TRIUMF Fax:  (604) 222-1074
> -----------------------------------
> Alberta: (780) 492-3862  /  Fax:  (780) 492-0714
> http://www.thehungersite.com/
>
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--

John Macdonald              phone :  (604) 222-7348  (direct line)
TRIUMF                                       (604) 222-1047 (switchbrd)
4004 Wesbrook Mall            fax :  (604) 222-1074
Vancouver, BC                  email :  john.macdonald@triumf.ca
Canada, V6T 2A3                            jam@triumf.ca

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