[mmaimcal] Polzn simulations

[Al Wootten]

Hi Mark

We'll hold a long-neglected imcal meeting next Tues and discuss this.
The Charge says: "Review the existing analysis for the polarization 
and mosaicing performance of the hybrid ALMA array and consider the 
priority and timescale for further analysis by the Science IPT"

So for now, I'm just trying to find existing stuff.  Thanks for the
info on 1/f--can you remind me where I can find the results to show
the ASAC?  

Tom is talking with Hills about running GRASP to generate the beam
patterns.  Right now, we do not have any info on the Melco antenna
and nothing on the AEM production antenna.  The estimate Tom gave me
suggested this would involve significant resources.  I would think that
perhaps the antenna IPT would plan a GRASP calculation in the course of
their statement of work but do not know.  Another tack to
take is to concoct an ATF program to do some measurements within that
facility's limitations.  It could be that this would be too little, too
late.  Optimally, we should discuss it and understand the situation.

Clear skies, and Happy New Year!
Al

Mark Holdaway writes:
 > Al,
 > I've done polarization simulations for the limiations of
 > the 1/f gain fluctuations, but that is about it.
 > 
 > Is the main question about wide field polarization results
 > and the leakage beam?  I think AIPS++ is now at a mature
 > enough spot that it could be used for such simulations.
 > Do we have access to someone who could run some optics
 > code (GASP?) to generate plausible polarization beam patterns?
 > I
 >     -Mark
 > 
 > Al Wootten wrote:
 > 
 > >Firstly--best wishes for the season, and especially for the New Year.
 > >
 > >I have a request from the distant past--back when the ACA
 > >Tiger Team were doing simulations, in Jul-Aug 2001, there were some 
 > >polarization simulations run by Dick Crutcher which were located at:
 > >ftp://iram.fr/pub/alma/fits/polar/Fits.tar.gz
 > >There was discussion at 
 > >http://www.cv.nrao.edu/~awootten/mmaimcal/asac/polznaca.txt
 > >They had filenames like:
 > >i19-aca.fits
 > >i-aca.fits
 > >i-alma.fits
 > >i19-alma.fits
 > >q19-aca.fits
 > >q-aca.fits
 > >q-alma.fits
 > >q19-alma.fits
 > >u19-aca.fits
 > >u-aca.fits
 > >u-alma.fits
 > >u19-alma.fits
 > >
 > >I'm not sure we have done any other polarization simulations--can anyone
 > >correct me?
 > >
 > >Of course, I think I did not copy them and cannot locate these files.
 > >Do any of you happen to have a copy of them?  If so I would be very 
 > >appreciative of a copy!
 > >
 > >Happy New Year,
 > >Al
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 > >mmaimcal at listmgr.cv.nrao.edu
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 > >  
 > >