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EVLA Phase II

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

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

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

  3. 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

  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. EVLA Advisory Committee Meeting June 11, 2002

  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. EVLA Advisory Committee Meeting June 11, 2002

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

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

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

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

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

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

  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 ? EVLA Advisory Committee Meeting June 11, 2002

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

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

  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. EVLA Advisory Committee Meeting June 11, 2002

  16. E + E-30 EVLA Advisory Committee Meeting June 11, 2002

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

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

  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++. EVLA Advisory Committee Meeting June 11, 2002

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

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