Re: beam tuning elog

[Brendan Kiburg <kiburg@npl.uiuc.edu>]

Dear Peter,
 I see some beam creeping in...20 microamps.

Also, there are 2 thin mylar foils on the muSC.  I vaguely recall
measuring the foil to be something like 7 microns with Bernhard.  So
roughly 15 microns mylar to go with the 500 microns of scint.

I'll either do the tuning tonight or tomorrow depending on the beam
progress.
Regards,
Brendan

On Wed, 10 May 2006, Peter Kammel wrote:

> Dear Brendan,
> 
> Sure we can do that in production. I agree on your sequence. You can
> always try to readjust the sep finally, to have a second iteration.
> 
> 1.09 - 1.088  is correct, depends whether your take dac or field
> values.
> 
> > If the beam comes back in a timely fashion, I will try to do this
> tonight. 
> 
> You should not have said that (see acc monitor). But it is not urgent.
> Just a consistency check. For wilder efforts I need to do some calcs.
> 
> I resubmitted the elog with little changes and my spreadsheet. Please
> try to extract the mPC foil thickness from our Russian colleagues,
> even if they have to email Valodja (Dan had a similar problem in
> interpreting the airscan).
> 
> Best regards
> 
> Peter
> 
> On Wed, 10 May 2006, Brendan Kiburg wrote:
> 
> > Dear Peter,
> >   I have some questions about your elog regarding beam tuning.
> > 
> > First, I calculate our ASK71/ASK72 as 1.088 .  We can adjust ASK72 up to
> > 8675 from 8528 to reduce the ratio to 1.07 .  
> > 
> > >From there, we would need to be careful not to misinterpret the
> > results.  Should we first adjust the FS72 slits to cut into the last 10%
> > of the beam, or should we first adjust the separator magnet?  
> > 
> > It seems to me if we first scan the sep and center the vertical focus on
> > the mupc, we could then play with FS72 to determine where the beam really
> > is.  We may then need to perform a secondary SEP scan to find the new
> > optimum for the new slit settings.
> > 
> > We can do this while in production mode, right?
> > 
> > If the beam comes back in a timely fashion, I will try to do this tonight.
> > 
> > Regards,
> > Brendan
> > 
>