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EVLA Siting Logistics

EVLA Siting Logistics. Sean Dougherty, HIA Chris Langley, NRAO.

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EVLA Siting Logistics

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  1. EVLA Siting Logistics Sean Dougherty, HIA Chris Langley, NRAO DVA1 Meeting at NSF

  2. The following discussion will examine the site challenges associated with testing a 15 meter (or to a lesser extent, 12m).The EVLA site has been discussed as a strong candidate for these tests.Involvement of the NRAO in the DVA1 project is presently being negotiated. DVA1 Meeting at NSF

  3. Siting Concerns • Antenna Fabrication Building • Antenna Pads / Interconnections • Existing Key Subsystems • Available Technical Support • Safety • Visitor-friendly Location DVA1 Meeting at NSF

  4. Antenna Fabrication Building • Dish cannot be manufactured in the open air • Dish mold (heavy) requires a concrete floor • Controlled air temperature required • Safe mold storage temperature is 5 ⁰C to 35 ⁰C, with minimal fluctuation • Resin infusion may occur between 15 ⁰C and 35 ⁰C • Clean environment required • Space required to manufacture a 15m X 18m dish1 • 55m L X 22m H X 10m ceiling apex, TBC • 19m L X 10m H opening • Fully outfitted • Lights, floor, HVAC, ventilation, work and storage, … [1] R. Hellyer, “Composite Applications for Radio Telescopes (CART): Portable Factory for Fabrication of Composite Dishes,” NRC-CART Memo #0026, December 24, 2009. DVA1 Meeting at NSF

  5. Antenna Fabrication Building • Cost to provide a suitable building could besignificant (~ $500K) • Existing EVLA structures • Do not fulfill basic requirements • Are unavailable due to EVLA construction schedule • Is a building capable of housing full production necessary at this time? [1] R. Hellyer, “Composite Applications for Radio Telescopes (CART): Portable Factory for Fabrication of Composite Dishes,” NRC-CART Memo #0026, December 24, 2009. DVA1 Meeting at NSF

  6. Antenna Pads / Interconnections • Seventy-two available EVLA pads • 12 Core SMF cable • 2 ethernet, 2 LO, 1 Data Transmission, 7 spares • 208 Vac 3 Ø, 60 Hz, 160 A/Ø • Antenna may occupy different locations • One available ALMA Test Facility pad • SM Corning Freedom 12 fibers • 208 Vac3 phase, 60 Hz, 250 A/Ø & 400 Vac 3 Ø, 200 A/Ø • Does not allow for multiple DVA1 locations • Requires limited re-work • DVA1 will require a metal frame adapter regardless of pad type DVA1 Meeting at NSF

  7. EVLA Pad Fiber Interface Pad Box – houses 12 terminated fibers Each Antenna travels with its own umbilical cord. DVA1 Meeting at NSF

  8. Existing Key Subsystems • Slots are available in WIDAR correlator for data receiver cards. • LO signals are available at all pads. • Monitor and Control System may be expanded to accommodate DVA1. DVA1 Meeting at NSF

  9. Available Support • Machine shop • Cryogenics group • HVAC expertise • Heavy lifting equipment & operators • Additional local expertise DVA1 Meeting at NSF

  10. Safety • EVLA Safety Officer present on site • Established safety procedures • Safety equipment available DVA1 Meeting at NSF

  11. Visitor-friendly Location • NRAO Guest House along with ample hotel rooms in Socorro • Restaurants and shopping in area • Tourist venues in the immediate area • Daily scheduled shuttles to/from the site DVA1 Meeting at NSF

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