K-Band Focal Plane Array Steven White Program Manager

Jay Lockman, Project Scientist Glen Langston, Scientist Steve White, Project Manager Matt Morgan, Project Engineer Roger Norrod, System Specifications Sivasankaran Srikanth, EM component Bob Simon, Mechanical Design Eric Bryerton, Noise Calibration Gary Anderson, Lo Design Bob Garwood and Amy Shelton, Data Pipeline Software Mark Whitehead, Software Dennis Egan, Component Construction John Ford and Galen Watts, M&C Hardware Design Patrick Brandt, M&C Software Design Personnel

 Science workshop determined efficiency improvements necessary for K Band: weather, observing requests, mapping programs.  Only enough funds for the receiver only, so the project was de-scoped to seven pixels that meets science objectives as specified in the science case. $1.2 M Total $0.19 M Parts $0.2 M Contingency $0.83 M Labor  The K band seven pixel focal plane array is the path finder instrument: a necessary first step and feasible considering time frame.  Production use by November,  Seven pixel array construction complete December, 2009 K-Band History

Purpose of Review  Given the K-band Focal Plane Array system specifications are derived for a specific scientific case, did the single K-band pixel demonstrate satisfactory performance as the prototype for the seven pixel instrument?  Is the final design of each component in compliance with the system specification? Is there any component that may compromise the instrument’s scientific objectives?  Are the compromises for expansion and decisions to simplify the design justified given the schedule and GBT turret constraints?  Is the schedule achievable, budget and spending reasonable, and are there any obvious critical path items that will compromise the program?  As defined by the observing-mode document, is the pipeline development and data analysis reasonable in its approach? Are there any other modes to be considered?

 Frontend Cryogenic Package Seven Dual Circular Polarization K-Band Pixels Modular Noise Calibration for each Pixel Modular Downconverter for each Channel (14 total) Monitor and Control Electronics LO Distribution and X2 Multiplier for LO1A  Software Package for Engineering M&C Observing Software Manager Data Analysis Pipeline  Cost per Pixel not including NRE. $46 K Parts (Dewar, EM, Isolator, HEMT Amp, WG, Noise Mod, IDM) $8.8K Labor for Construction and Test (Engineer and Technician)  NRE (3 Years). $ 295 K Software Manager and Data Pipeline $ 250 K Engineering $ 127 K Science Deliverables

 02/28/08 Conceptual Design Review.  08/13/08 M&C Hardware Module with support software complete.  08/22/08 Single Pixel Construction Complete.  08/31/08 Initial cool down and measurement.  12/31/08 GBT and Laboratory Tests Complete Milestones

 1/31/09 Critical Design Review  04/01/09 EM Parts Fabrication Complete.  08/04/09 Dewar Assembly Complete.  12/07/09 Hardware Construction w Manager Complete.  01/01/10 System Integration and Lab Tests Complete  02/02/10 Telescope Testing complete.  11/08/10 Commissioning complete. Milestones for Completion

 GBT Observation Results  System Specification and Laboratory Tests  EM Component Results  Noise Module  Integrated Down Converter  Mechanical Design  LO Design  Monitor and Control Hardware  Monitor and Control Software  Data Pipeline CDR Topics

Budget and Expenses All Big Ticket Items Thru 2009

 Smaller Dewar Reduced Cryogenic Loads Smaller Reliable Refrigerator Shared Compressor Weight Reduction  Mechanical Design Individual Thermal Transitions Individual Waveguide Transitions  During expansion seven pixel stays intact Compromises

 Significantly enhanced spectrometer with this new array and existing IF system.  New digital I.F. distribution system. (Spectrometer and technology dependent).  Expanded K-Band Instrument. (Spectrometer and technology dependent).  W-Band Focal Plane Array (Recent 9% surface improvement) FPA Wish List