One way to guess the effect of a residual field on our data is to note
that our sensitivity to the 2T field is at about 1/10,000.  That is, we
are sensitive to 2G.

Therefore, for Michel positrons, we need a field less than about 2G if
we want to say we have "field off".

The situation for beam pions at 120 MeV/c is not vastly different. 
P-perp is somewhat smaller, so perhaps our sensitivity is greater.  In
any case, 300G residual field sounds very big.

Can someone make a more reliable estimate of the effect of a residual
field on our apparent resolution?

Perhaps we need to do alignments by tracking helices in a small field,
rather than assuming zero field.

			nate

-- 

Nathan Rodning
Professor of Physics, University of Alberta
**** 2001/02 at TRIUMF:  (604) 222-7549
**** TRIUMF Fax:  (604) 222-1074
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