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Thank you all for the advice.
I refocused to get a semi-acceptable peak shape. But I maxed out my
x-deflection to do so. Perhaps my flight tube indeed is out of whack and I
can only correct in the X direction  so much with the potentiometers.

You are all a wealth of knowledge, thanks again!
Andrew
On Dec 17, 2015 4:50 PM, "Ross Beaudette" <[log in to unmask]> wrote:

> In addition to those that have written, I can offer the following:
> -If you cleaned the flight tube, the magnet might be off kilter by a tiny
> margin.  It is possible it needs to be put back into its exact previous
> position, which is a very touchy operation with a rubber mallet.  This is
> only if the peaks aren't lined up with one another.
>
> -If you wanted to be sure it's not the electronics or source cleaning:
> Run a scan of intensity vs time for several hours (preferably overnight)
> with your standard gas.  In the morning, blow up the plot so you can see
> the resolution of your prominent cup during the scan time.  If there's any
> noise or bad resolution (steps, negative spikes, etc) you may have leakage
> current across your ceramics.  If you're sure the source isn't an issue,
> and the bad peak shape is on all the cups, look into the ion source control
> board next.  Hope this helps.
>
> Ross
>