EVLA%20Advisory%20Committee%20Meeting - PowerPoint PPT Presentation

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EVLA%20Advisory%20Committee%20Meeting

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EVLA Advisory Committee Meeting. June 11, 2002. Criteria for now ... areas, population concentrations, potential. interference, etc ... – PowerPoint PPT presentation

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Title: EVLA%20Advisory%20Committee%20Meeting


1
EVLA Phase II
  • NMA and E-array Progress

2
People
  • Aaron Cohen
  • Steve Durand
  • Leonia Kogan
  • Bob Tacker
  • Cam Wade
  • Craig Walker

3
NMA Puzzle
  • Combine UV Coverage,
  • Land Availability,
  • Power Availability and
  • Fiber Optics Network
  • into a practical Array Design

4
Criteria for now
  • Fiber --- Find Sites Near Existing, Available
  • Fibers.
  • Power --- Find Sites with minimum distance
  • from 3-phase power.
  • Land --- Find sites with multiple acceptable
  • land options.

5
Criteria for now
  • Stay away from sensitive environmental
  • areas, population concentrations, potential
  • interference, etc
  • In some cases add, somewhat longer
  • runs of fiber or power to fill out uv coverage.
  • Current array is likely to be modified later.

6
NMA Sites
7
NMA - Milagro
8
NMA - Separ
9
Fidelity 100km

10
Fidelity Full Resolution

11
NMA Sites
12
NMA Issues
  • What is An Acceptable Configuration ?
  • What should happen in 2003 ?
  • Should we continue full speed ahead
  • (at some expense to phase I)
  • or should we mothball NMA until
  • we get real funding ?

13
E-array
  • Goal
  • Better Fidelity and
  • Surface Brightness
  • Sensitivity at minimum
  • Cost.

14
E UV-coverage
15
E-array
  • However, E array beam-shape, shadowing
  • become a problem in the south (e.g. 30d)
  • To image well in the south we need
  • a stretched E-array.

16
E E-30
17
Shadowing
Regular E Array
E-30 Array
18
E-30 UV-coverage
19
Simulations
  • Plan for the phase II completion
  • document is for full mosaic simulations
  • (including GBT) to test E and
  • E-30 performance using AIPS.

20
E-array Issues
  • How much simulation for E should we
  • do ?
  • Do we want E-30 ?
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