1. NMA and E-array Progress
EVLA Phase II
NMA and E-array Progress
Frazer Owen
EVLA Advisory Committee Meeting
June 11, 2002

2. EVLA Advisory Committee Meeting
People
Aaron Cohen
Steve Durand
Leonia Kogan
Bob Tacker
Cam Wade
Craig Walker
Frazer Owen
EVLA Advisory Committee Meeting
June 11, 2002

3. EVLA Advisory Committee Meeting
NMA Puzzle
Combine UV Coverage,
Land Availability,
Power Availability and
Fiber Optics Network
into a practical Array Design
Frazer Owen
EVLA Advisory Committee Meeting
June 11, 2002

4. EVLA Advisory Committee Meeting
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.
Frazer Owen
EVLA Advisory Committee Meeting
June 11, 2002

5. EVLA Advisory Committee Meeting
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.
Frazer Owen
EVLA Advisory Committee Meeting
June 11, 2002

6. EVLA Advisory Committee Meeting
NMA Sites
Frazer Owen
EVLA Advisory Committee Meeting
June 11, 2002

7. EVLA Advisory Committee Meeting
NMA - Milagro
Frazer Owen
EVLA Advisory Committee Meeting
June 11, 2002

8. EVLA Advisory Committee Meeting
NMA - Separ
Frazer Owen
EVLA Advisory Committee Meeting
June 11, 2002

9. EVLA Advisory Committee Meeting
Fidelity “100km”
Frazer Owen
EVLA Advisory Committee Meeting
June 11, 2002

10. Fidelity Full Resolution
Frazer Owen
EVLA Advisory Committee Meeting
June 11, 2002

11. EVLA Advisory Committee Meeting
NMA Sites
Frazer Owen
EVLA Advisory Committee Meeting
June 11, 2002

12. EVLA Advisory Committee Meeting
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 ?
Frazer Owen
EVLA Advisory Committee Meeting
June 11, 2002

13. EVLA Advisory Committee Meeting
E-array
Goal:
Better Fidelity and
Surface Brightness
Sensitivity at minimum
Cost.
Frazer Owen
EVLA Advisory Committee Meeting
June 11, 2002

14. EVLA Advisory Committee Meeting
E UV-coverage
Frazer Owen
EVLA Advisory Committee Meeting
June 11, 2002

15. EVLA Advisory Committee Meeting
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.
Frazer Owen
EVLA Advisory Committee Meeting
June 11, 2002

16. EVLA Advisory Committee Meeting
Frazer Owen
EVLA Advisory Committee Meeting
June 11, 2002

17. EVLA Advisory Committee Meeting
Shadowing
Regular E Array E-30 Array
Frazer Owen
EVLA Advisory Committee Meeting
June 11, 2002

18. EVLA Advisory Committee Meeting
E-30 UV-coverage
Frazer Owen
EVLA Advisory Committee Meeting
June 11, 2002

19. EVLA Advisory Committee Meeting
Simulations
Plan for the phase II completion
document is for full mosaic simulations
(including GBT) to test E and
E-30 performance using AIPS++.
Frazer Owen
EVLA Advisory Committee Meeting
June 11, 2002

20. EVLA Advisory Committee Meeting
E-array Issues
How much simulation for E should we
do ?
Do we want E-30 ?
Frazer Owen
EVLA Advisory Committee Meeting
June 11, 2002