MMA Imaging and Calibration Group
Agenda/Minutes for meeting Wednesday, 26 Feb 2003 at 4:00pm EDT.
Date: 26 Feb 2003
4:00 pm EST
(2:00 pm Socorro, 2:00 pm Tucson)
Phone: (434)296-7082 (CV SoundStation Premier Conference phone 3rd floor).
Past minutes, etc on
MMA Imaging and Calibration Division Page
Notes from the meeting are in this font!
Science IPT News - Wootten
News from my point of view. Discussion of Tucson news, ALMA Board news.
- Level 3 milestones
have now been submitted. Someday I will figure out how to make
presentable copy from Excel, then I can share them.
Project News -
ALMA Project Office has moved to Ivy Commons on Old Ivy Road.
First meeting of the ALMA Board was held 24-5 Febin Arlington, Virginia.
Preliminary Design Review
will be held in Tucson 18-20 March 2003.
The European ALMA workshop in Leiden 18-20 December was held. I have put into almaedm the presentations
which i received.
AMAC Meeting 24-25 March Socorro
ASAC Face-to-face Meeting 2-3 April 2003 in Grenoble, France at IRAM.
A tentative agenda is available at the link to the 5 Mar telecon above.
May 26/27 ALMA Board face-to-face (Europe)
ALMA Week 2-6 June Victoria
November 3/4 ALMA Board face-to-face (N.A.?)
Proposed correlator upgrade -- Wootten
review memo 441 by Escoffier and Webber.
Webber presented a table of Modes for the new correlator upgrade which is
under investigation. Tests are under way to determine the costs of this
development, but current indications are that implementation can be achieved
with little cost increase, though more testing will be required.
You have received a copy of a message from Steve Scott on behalf of the SSR,
requesting comments from the Science IPT on the ALMA data rates:
"The SSR has decided to drop its proposal for increasing the ALMA data rates
in favor of a new proposal that takes into account the capabilities of the
enhanced correlator. We would like input from the Science IPT before making
this proposal and hope that you will help us. I have attached a document
(EnhancedCorrelator.pdf) that attempts to make some assumptions to distill
out reasonable constants in the data rate equation. If these are accepted at
face value, the main unknown in the average data rate is the number of
channels. The second attachment (DataRates.pdf) is our previous request for
a rate increase. It contains more background material and examples that are
not duplicated in the newer document.
The newer document contains recommendations, some with more emphasis than
others, as it seems easier to iterate from a given position rather than
starting from scratch. But feel free to examine any aspect of the problem.
Please don't hesitate to contact me or any SSR member if there are
Mel Wright answered; as did John Richer. Are there other comments?
Mel noted that the VLA potential could not be harnessed for years.
Now it seems quaint that this was ever a consideration. I hear a consensus
that the 8 MB/s specification for mean datarate is probably adequate.
It could well seem quaint too by full operation.
The peak datarate may limit productivity, particularly in data-intensive
modes such as on the fly interferometry (this will not likely be a supported
mode at the beginning of full operations).
Polarization Widget -- Wootten
Hans Rudolf asks:
To complete the FE specifications, I need to clarify the centre
frequency for the quarter wave plate:
Could you please indicate it to me?
After much discussion, it was decided that the polarization widget,
perhaps a quarter wave plate, will be inserted at Band 7.
Scientific Benefits of a Single Antenna Design -- Wootten
scientific reasons favoring a single antenna design. At its
first meeting, in item
(21), The Board endorsed the goal of the JAO to procure the production
antennas to a single design which has been prototyped and evaluated.
Note that it is a goal.
Illumination Offsets -- Holdaway
See Mark's report on
tests and milestones. Recall that in ALMA Memo No. 402, Mark showed that
offsets in the illumination of the dishes by the feeds would result in a phase
graident in voltage patterns, a serious problem for high dynamic range
mosaicing. Mark notes that a simple correction algorithm can remove
essentially the entire effect of the voltage pattern phase gradient.
In the report, he explores how to measure the offsets and to apply corrections
to the (u,v) coordinates.
Calibration - All
new SMA Memos from Martina Wiedner.
List of the status of the reviews/reviewers. The key is: "C" - already
submitted a review; "U" = submitted an unsolicited review; "Y" = agreed
to review the memo; "N" - declined to review the memo; "NR" - no response.
Links are provided to reviews; please consult the archive for subsequent
1 - Memo 423 - Steve Myers (Y), Matt Carter (N), Geoff Blake (Y)
2 - Memo 422 - Douglas Bock (Y), Lee Mundy (NR),
Jeff Mangum (C)
Dave Woody (U)
3 - Memo 427 -
Robert Lucas (C)
, Ed Fomalont (NR),
Craig Walker (C)
4 - Memo 372 -
Jeff Mangum (C)
Larry D'Addario (C)
, Mark Gurwell (N),
Bryan Butler (U)
5 - Memo 415 - Jose Cernicharo (Y),
Mark Holdaway (C)
, John Richer (Y)
6 - Memo 404 & 403 - Mel Wright (N),
Dave Woody (Y&C)
, John Richer (Y)
8 - Memo 402 - Richard Hills (Y), Peter Napier (NR)
9 - Memo 352 -
Dave Woody (C)
Chris Wilson (C)
, Dick Plambeck (N)
10 - Memo 434 -
Stephane Guilloteau (C)
so, as yet no response from:
Lee Mundy - 422
Ed Fomalont - 427
Peter Napier - 402
and awaiting agreed upon reviews from:
Steve Myers - 423
Geoff Blake - 423
Douglas Bock - 422
John Richer - 415, 404, 403
Richard Hills - 402
AIPS++ - Myers
The Skeptical Review is scheduled early March. Review board still being
impanelled, I guess.
Configuration - Holdaway
Large Configuration: Progress Report.
Conway has developed the antenna pad specifications.
The Configuration Group has delivered the configuration plan to the Site
Group, and surveyors are at work at Chajnantor. For photos, please see
this Configuration realization page.
Pad spacing--should it differ from antenna spacing?
In the version D
of the configuration document
(ALMA-90.02.00.00-001-D-SPE) the distance between pads is set to a
distance of 15.15m. Last chance for comments!!!
No report this week.
The JAO has decided to compile reports on a quarterly basis, rather
NA bimonthly report for January was sent to the NA Project Office for
NSF. When the end of
Feb arrives, this will be amplified by Feb activities and EU
items and forwarded to the JAO as this text.
Please send materials to HAW for NA.
Upcoming Meetings - Wootten
JUN 22-27, 2003 2003 IEEE AP-S INTERNATIONAL SYMPOSIUM AND
USNC/CNC/URSI NATIONAL RADIO SCIENCE MEETING
JUL 13-26, 2003 Twenty-Fifth
General Assembly of the IAU Abstracts due NOW.
JUL 22/25, 2003 IAU
Symposium (221): Star Formation at High Angular Resolution,
Sydney, Australia. Tyler Bourke is a co-chair of the scientific
organizing committee. Good opportunity to show ALMA capabilities.
SEP 22-26, 2003 4th
Cologne-Bonn-Zermatt-Symposium on The Dense Interstellar Medium in Galaxies