[mmaimcal] Receiver priorities

[Al Wootten]

Hi, John.

You asked yesterday about receiver priorities.  The MAC said in November:
'It is unreasonable to expect all 9-10 receivers to be completed for 60 or more telescopes by the time the MMA/LSA comes on-line. Therefore the plan to
install only three bands initially is reasonable. We recommend that two of the 3 bands should definitely be 90 GHz and 650 GHz. The third could be either
230 GHz or 345 GHz; compelling arguments for either can be made. The MAC favored 230 GHz over 350 GHz, but only marginally. 

The remainder of the receivers should be installed as rapidly as possible. The MAC foresees a major operation installing more than 400 additional receivers,
the logistics of which will have to be carefully planned. There should be a priority ordering of the subsequent bands to be installed as part of the plan of
deployment and a time line should be worked out. The preferred sequence of receiver installation should be established on the basis of community input,
either via the MAC and its European counter part or at the Science meeting next year. '

As I read this, the first priority for bands lies with 90-115, 230, 650, 
350 GHz.  That is, using the numbering and frequencies from MMA Memo 213,
Band No. 3, 89-116 GHz
Band No. 6, 211-275 GHz
Band No. 9, 602-720 GHz
Band No. 7, 275-370 GHz
The MAC seems to favor reserving judgment on the subsequent sequencing of
receiver installation.  I'll jump the gun and make a proposal.
After that, I would recommend the order be
Band No. 2, 67-90 GHz
Band No. 4, 125-163 GHz
Band No. 5, 163-211 GHz
Band No. 8, 385-500 GHz
Band No. 1, 30-40 GHz
Band No. 10, 787-950 GHz

which I propose for a discussion topic at our Imaging and Calibration
Meeting next week, and for the MAC, which might meet next Weds.

Clear skies,
Al
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| Alwyn  Wootten   (http://www.cv.nrao.edu/~awootten/)	 |
| Project Scientist, The Millimeter Array                |
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