[mmaimcal] ACA Antenna Specs

[Bryan Butler]

we also, in the ACA System Design Review, pointed out that it might benefit to 
have WVRs on the 7-m antennas, to overcome this shortcoming.  this was rather 
coolly received, but i did my part by bringing it up...

	-bryan


On 12/14/06 15:51, Al Wootten wrote:
> Hi Mark
> 
> In my understanding interpolation is the plan, for the atmosphere from the
> WVRs on the 12ms and the instrumental part will have to be guesstimated from 
> phase calibrator observations.  During these, of course, the 7m can benefit
> by the many more antennas to which they will have baselines.
> 
> In fact, the joint correlated observation mode still needs a change request,
> to go past the change committee and through the Director.  During this
> process we need to address questions of exactly this ilk.  As a result of the
> process, we'll come to understand better the full cost of the 'upgrade' of
> which software additions will be a component.  As we noted yesterday, so will
> the lower efficiency as the array waits for the 7m upon slewing to a source.
> But Tetsuo notes the higher efficiency in terms of 7m calibration offsets this.
> 
> This all needs careful thought.
> 
> Clear skies,
> Al
> Mark Holdaway writes:
>  > Al,
>  > 
>  > If "ACA does not fast switch", what is the phase calibration strategy for
>  > when we do joint correlated observations?  Will the ACA's 4 large dishes
>  > phase solutions be spatially interpolated for teh ACA antennas?
>  > If so, more software.
>  >  
>  >     -Mark
>  > 
>  > 
>  > 
>  > Al Wootten wrote:
>  > 
>  > >Folks,
>  > >
>  > >Yesterday we discussed the science implications of changes proposed for the ACA 
>  > >7m antenna specifications and requirements.  I tried to summarize these.
>  > >In the spaces of today's LPR and LLC discussions I spoke about these with
>  > >Tetsuo.  On the basis of our chat, I think I understand the reasons for some
>  > >of these changes.  In principle, I think it is not good to have many different
>  > >versions of antenna specifications and requirements.  But ALMA is a project of
>  > >practicalities, not principles.
>  > >
>  > >I added some further words to the discussion document at:
>  > >http://www.cv.nrao.edu/~awootten/mmaimcal/ACASpecReqsDiffs.txt
>  > >Please comment.
>  > >
>  > >Clear skies,
>  > >Al
>  > >+--------------------------------------------------------+
>  > >| Alwyn  Wootten   (http://www.cv.nrao.edu/~awootten/)	 |
>  > >| Project Scientist, Atacama Large Millimeter Array/US   |
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