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Review Context and Purpose

Review Context and Purpose. Selection of OMT Design for the EVLA X-band Receiver. Mark McKinnon. EVLA Project Manager. Context. X-band OMT identified as a significant technical risk to the EVLA project at the EVLA Risk Management Workshop held in Dec 2006

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Review Context and Purpose

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  1. Review Context and Purpose Selection of OMT Design for the EVLA X-band Receiver • Mark McKinnon • EVLA Project Manager

  2. Context • X-band OMT identified as a significant technical risk to the EVLA project at the EVLA Risk Management Workshop held in Dec 2006 • Likely that the extension of other EVLA OMT designs to X-band would be too large and could not be cooled with a CTI model 22 refrigerator • Existing cryogenics and electrical infrastructure on EVLA antennas cannot support the larger model refrigerator (CTI 350) that might be required by a large OMT • Model 350 refrigerators for X-band not in EVLA project budget • X-band OMT has the highest cost impact of any item on the EVLA risk register • Alternative OMT designs pursued to mitigate risk

  3. Cost Impact of Adding Model 350 Refrigerator • Model 350 refrigerator (30 x $7K) $210K • He compressor (30 x $7K) 210 • 5/8" SS tubing (He supply & return) 25 • New fuses in antennas & control bldg 20 • Replace SEC transformer & wiring 75 • Charcoal traps (30 x $1.2K) 36 • Cryo. tech (1 FTE-yr, loaded salary) 50                                   Total   $626K Note: costs do not include those of the selected OMT

  4. Schedule and Budget • Schedule • X-band receiver production scheduled to commence in Jan 2010 • Receiver production rate: about one per month • Completion scheduled for end of FY2012 (i.e. Sep 30, 2012) • Budget • Total M&S budget for X-band receiver is $561K • $54K expended as of August 31, 2009 • Budget currently deemed adequate for any OMT design that might be selected (but not for additional cryogenic and electrical infrastructure that might be required) • If absolutely necessary, sufficient funds are available in project contingency to cover additional infrastructure costs

  5. Review Purpose • Review and compare the designs for the X-band OMT • Review possible impacts on the cryogenic and electrical infrastructure of the EVLA antennas • Select a path forward for the selection of the OMT • Identify any remaining issues associated with the preferred OMT design

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