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EVLA Phase II. NMA and E-array Progress. People. Aaron Cohen Steve Durand Leonia Kogan Bob Tacker Cam Wade Craig Walker. NMA Puzzle. Combine UV Coverage, Land Availability, Power Availability and Fiber Optics Network into a practical Array Design. Criteria for now.

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evla phase ii

EVLA Phase II

NMA and E-array Progress

EVLA Advisory Committee Meeting

June 11, 2002

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

EVLA Advisory Committee Meeting

June 11, 2002

nma puzzle
NMA Puzzle

Combine UV Coverage,

Land Availability,

Power Availability and

Fiber Optics Network

into a practical Array Design

EVLA Advisory Committee Meeting

June 11, 2002

criteria for now
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.

EVLA Advisory Committee Meeting

June 11, 2002

criteria for now1
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.

EVLA Advisory Committee Meeting

June 11, 2002

nma sites
NMA Sites

EVLA Advisory Committee Meeting

June 11, 2002

nma milagro
NMA - Milagro

EVLA Advisory Committee Meeting

June 11, 2002

nma separ
NMA - Separ

EVLA Advisory Committee Meeting

June 11, 2002

fidelity 100km
Fidelity “100km”

EVLA Advisory Committee Meeting

June 11, 2002

fidelity full resolution
Fidelity Full Resolution

EVLA Advisory Committee Meeting

June 11, 2002

nma sites1
NMA Sites

EVLA Advisory Committee Meeting

June 11, 2002

nma issues
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 ?

EVLA Advisory Committee Meeting

June 11, 2002

e array
E-array

Goal:

Better Fidelity and

Surface Brightness

Sensitivity at minimum

Cost.

EVLA Advisory Committee Meeting

June 11, 2002

e uv coverage
E UV-coverage

EVLA Advisory Committee Meeting

June 11, 2002

e array1
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.

EVLA Advisory Committee Meeting

June 11, 2002

e e 30
E + E-30

EVLA Advisory Committee Meeting

June 11, 2002

shadowing
Shadowing

Regular E Array E-30 Array

EVLA Advisory Committee Meeting

June 11, 2002

e 30 uv coverage
E-30 UV-coverage

EVLA Advisory Committee Meeting

June 11, 2002

simulations
Simulations

Plan for the phase II completion

document is for full mosaic simulations

(including GBT) to test E and

E-30 performance using AIPS++.

EVLA Advisory Committee Meeting

June 11, 2002

e array issues
E-array Issues
  • How much simulation for E should we

do ?

  • Do we want E-30 ?

EVLA Advisory Committee Meeting

June 11, 2002