Minutes for meeting Mon, 20 September 1999 at 4pm EDT.
Date: 20 September 1999
Time: 4:00 pm EDT (2:00 pm Socorro, 1:00 pm Tucson)
Phone: (804)296-7082 (CV SoundStation Premier Conference phone).
Past minutes, etc on MMA Imaging and Calibration Division Page
Minutes
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The data rate figure I've been carrying in the project book is 1MB/s average, 10MB/s max sustained. This comes from the Scott et. al. memo (#164) which in turn apparently came from a Tucson science meeting (40 antennas). Mark Holdaway should know about this number. Rupen in a later memo ( #194) comes up with a science case for 100's of MB/s (OTF synthesis surveys). Note that the NRAO correlator design is capable of dumping data from the LTA at a rate of 1GB/s.
What is the science-driven rate?
The science requirement which most drives this is:
Wide Field of view which has as components
Here are the spectral channels/bandwidth values for the prototype LTA. The
minimum integration time is 16 ms for cross-corretations & 1 ms for
auto-correlations
(i.e., there is no time/spectral channel trade off as in earlier designs)
Mode Spectral Baseband Baseband
Channels Bandwidth Bandwidth
not oversampled oversampled
0 512 2 GHz 1 GHz
1 1024 1 GHz 500 MHz
2 2048 500 MHz 250 MHz
3 4096 250 MHz 125 MHz
4 8192 125 MHz 62.5 MHz
5 16384 62.5 MHz na --------
Comments on MMA Memo No. 274.
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So here is a possible agenda for the 9 October meeting.
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ALMA Science Advisory Committee
9 October 1999
Agenda
Omni Shoreham Hotel
0900 Committee Caucus
Overview of the Project at Midcourse -- R. Brown
Antenna Procurement Contract -- P. Napier, Anderson(?)
Other Technical Reports
Report on LO PDR -- as appropriate
ALMA Frequncy Bands -- Wootten
Science updated -- Wootten
Blueprint for the Joint ALMA Project D&D Phase -- R. Kurz, R. Brown
Definition and Formation of Joint ALMA Science Advisory Committee -- Wootten, Churchwell,
Guilloteau, Menten
Committee Caucus -- Churchwell, Menten
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Stephane proposed a similar set of goals:
" US-Europe Meeting goals
- Setup a proposal for the joint ALMA SAC (format, suggested names perhaps in a restricted session)
- Discuss timeline differences between Europe and US
- Discuss the 35 GHz band issue
- Discuss the longest baseline issue
- Present and discuss the draft Work Plan which we must have prepared for that date (I'll send you soon a preliminary draft)
- Discuss our position vis-a-vis the Japanese proposals
- Any items you wish
- Any other business
Since most of the scientific topics will have been covered before, I believe we should stick to practical problems."
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I will update everyone on the status of this event.
Registered: 169 (-2 cancellations)
Paid: 115
Banquet: 109
Posters: 52 abstracts received; 72 including intendees. Kate has posted these to the WWW. I will order posterboards enough for 72 posters.
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What science will be lost if we have three or fewer subarrays? --------
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DECISION: Configurations--where are we?
DECISION: Is a nutating secondary necessary?
DECISION: What is the effect of 1/f noise in the HEMT amplifiers of SIS receivers upon our ability to combine total power and interferometric images into a faithful representation of the sky?
MEETINGS: MAC meeting 15 September 1999 at noon. Next ImCal meeting 13 September 1999. ------
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If your travel isn't on here you have not sent me a travel authorization.
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A. Wootten:
J. Mangum:
M. Yun:
B. Butler:
S. Radford: