[BLAST_SHIFTS] shift in ion pol mass peaks

From: Hauke Kolster (hauke@lns.mit.edu)
Date: Mon Sep 08 2003 - 11:35:59 EDT


Yuan,
We recently reversed the target holding field. That means that the
direction
of the residual field generated at the magnet of the ion polarimeter
was also
reversed. Did you do calculations for the ion polariemter with the
target
magnetic field included? What effect do you expect on the magnet of the
ion
polarimeter? Did you do a hysteresis suppression cycle before you
measured
the mass peaks?

Hauke

> But the mysterious thing is that istead of what we got before (MASS 1
peak
> located at I_WF=1.25A and MASS 2 peak located at I_WF=1.75A), two and
only
> two peaks were found at I_WF=0.85A and I_WF=1.20A , no matter the
long.
> holding field was on or off. Since these two I_WF's satisfy the
sqare root 2
> relation, it seems that somehow the locations of the mass peaks were
moved.
> More study about this is needed.



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