[mmaimcal] Solar Attenuator

[Jeff Mangum]

Hi Bryan,

Bryan Butler wrote:
> when looking at the sun, calibration has a completely different meaning.  i 
> suspect you would never do fast switching calibration when observing the sun. 
> switching the attenuator in and out would screw the calibration up.  you should 
> get the opinion of the solar observers (bastian, white, etc.), but i'd guess 
> that in the solar case you will want a nearly unique calibration scheme.
>   
Yup.  We have been discussing this with Tim.  See 
https://wikio.nrao.edu/bin/view/ALMA/CalSolar.

-- Jeff
>
> On 7/11/06 15:30, Mark Holdaway wrote:
>   
>> Another issue which I have been ignoring, but should not if it
>> takes 7 seconds cycle time on removing/inserting the solar attenuator:
>>
>> People observing the sun would probably like to have a fairly continuous
>> time series.  If we do fast switching, that means that we have data for 
>> 26 seconds
>> and we miss the sun's dancing for 4 seconds.   With a 7second 
>> remove/insert, then
>> we will probably be on the sun for like 22 seconds and off for 8-9 
>> seconds, resulting in
>> larger gaps in the solar coverage.
>>
>>     -Mark
>>
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