Re: [BLAST_SHIFTS] shift in ion pol mass peaks

From: Tancredi Botto (tancredi@mitlns.mit.edu)
Date: Mon Sep 08 2003 - 12:11:41 EDT


Hauke,
how much are we sensitive to the history of the hfield direction in the
wft and sft units ? And can we optimize the sft and wft orientation w.r.t
the holding field ?

-- t
________________________________________________________________________________
Tancredi Botto, phone: +1-617-253-9204 mobile: +1-978-490-4124
research scientist MIT/Bates, 21 Manning Av Middleton MA, 01949
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On Mon, 8 Sep 2003, Hauke Kolster wrote:

>
> 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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