[asac] ASAC topic

[Tetsuo Hasegawa]

Dear Ewine and Geoff,

As Yasuo Fukui is now travelling, I propose a topic for the coming ASAC
telecon tomorrow.

Before the Florence meeting, ASAC has been asked by ALG on the priority
among the enhancements enabled by Japanese participation under a 10% cut
(see the attached pdf document).  At the beginning of the Florence meeting,
we are told that ACC now wants ASAC to think about the priorities under 20%
cut.  We tried to do so in the course of the meeting, with a very miserable
mood, and managed to squeeze out some choice.  We did not have time and
energy in Florence to think of the 10% case.  At the same time, ASAC have
sent a letter to ACC to think the 20% cut over again.

The above sequence of events means that we still need to make a
prioritization for the 10% cut constraint.  I would like to present a model
supported by Japanese ASAC members as follows.  We believe that it greatly
enhances the scientific capability of ALMA in many ways while staying within
the budgetary constraints set by the 10% cut.  We want to hear the ASAC
thoughts on Wednesday.

Net new resource assumed $140M (under 10% cut, overhead of ALG-estimated
$50M removed; see the pdf document)

<Three major enhancements>
1) Add 2 receiver bands (Bands 8 and 10): $30M
2) Build ACA with 6 bands: $70M
3) Build the enhanced correlator: $35M
--------------------
Total: $135M

<Rooms for furhter adjustments/tradeoffs>
*adding 1 or 2 receiver bands (Bands 4 and 1): +$10 to 20M
*give up 2SB capability: -$20M (estimate of cost reduction being made at
Nobeyama)
*refinements of the estimate of "overheads"
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_______________________________________________________________
!!! My e-mail address has changed !!!

Tetsuo HASEGAWA, D. Sc.   <tetsuo.hasegawa at nao.ac.jp>
ALMA-J Project Scientist
Professor, National Astronomical Observatory of Japan
2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan
Phone +81-422-34-3843 / FAX +81-422-34-3764
_______________________________________________________________