GBT Focal Plane Array K band 7 Pixel Steven White Program Manager

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

K band History Science workshop determined efficiency improvements necessary for K Band: weather, observing requests, mapping programs. 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. 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 $1.2 M Total $0.19 M Parts $0.19 M Parts $0.2 M Contingency $0.2 M Contingency $0.83 M Labor $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. The K band seven pixel focal plane array is the path finder instrument: a necessary first step and feasible considering time frame. Seven pixel array construction complete December, 2009 Seven pixel array construction complete December, 2009 Production use by November, Production use by November, 2010.

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? 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? 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? 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? 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 ad data analysis reasonable in its approach? Are there any other modes to be considered? As defined by the observing-mode document, is the pipeline development ad data analysis reasonable in its approach? Are there any other modes to be considered?

K-band FPA Deliverables Frontend Frontend Cryogenic Package for Seven Pixel Instrument Cryogenic Package for Seven Pixel Instrument Seven Dual Circular Polarization K band Pixels Seven Dual Circular Polarization K band Pixels Modular Noise Calibration for each Pixel Modular Noise Calibration for each Pixel Modular Downconverter for each Channel (14) Modular Downconverter for each Channel (14) Monitor and Control Electronics Monitor and Control Electronics LO Distribution with Doubler for LO1A LO Distribution with Doubler for LO1A Software Software Package for Engineering M&C Package for Engineering M&C Observing Software Manager Observing Software Manager Data Analysis Pipeline Data Analysis Pipeline Cost per Pixel not including NRE. Cost per Pixel not including NRE. $46,000 Parts (Dewar,EM parts, Isolator, HEMT Amp, WG parts, Noise Mod, IDM) $46,000 Parts (Dewar,EM parts, Isolator, HEMT Amp, WG parts, Noise Mod, IDM) $2500 Labor Construction. $2500 Labor Construction. $2500 Software upgrades. $2500 Software upgrades.

Milestones 02/28/08 Conceptual Design Review acceptance. 02/28/08 Conceptual Design Review acceptance. 05/08/08 Single Pixel Construction Complete 05/08/08 Single Pixel Construction Complete 08/13/08 M&C Hardware Module with support software complete. 08/13/08 M&C Hardware Module with support software complete. 08/22/08 Single Pixel Construction Complete 08/22/08 Single Pixel Construction Complete 08/31/09 Initial cool down and measurement. 08/31/09 Initial cool down and measurement. 12/31/09 GBT Tests Complete. 12/31/09 GBT Tests Complete. 1/31/09 Critical Design Review 1/31/09 Critical Design Review 12/01/09 Observing Support software complete. 12/01/09 Observing Support software complete. 12/01/09 Multi-pixel Testing Construction complete. 12/01/09 Multi-pixel Testing Construction complete. 01/01/10 System Integrate & LAB Test complete. 01/01/10 System Integrate & LAB Test complete. 02/18/10 Data Analysis software complete 02/18/10 Data Analysis software complete 04/06/10 Telescope Testing complete. 04/06/10 Telescope Testing complete. 11/08/10 Commissioning complete. 11/08/10 Commissioning complete.

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

Budget and Expenses Thru 2010 All Big Ticket Items

Compromises Smaller Dewar Smaller Dewar Reduces cryogenic load Reduces cryogenic load Smaller refrigerator Smaller refrigerator Shared compressor Shared compressor Reduced weight Reduced weight Reduction in Mechanical Complexity Reduction in Mechanical Complexity Individual thermal transitions Individual thermal transitions Individual waveguide output transitions Individual waveguide output transitions

Future FPA Developments Wish List Significantly enhanced spectrometer with this new array and existing IF system. Significantly enhanced spectrometer with this new array and existing IF system. New digital I.F. distribution system. (Spectrometer and technology dependent). New digital I.F. distribution system. (Spectrometer and technology dependent). Expanded focal plane array (perhaps at a different frequency: W band) Expanded focal plane array (perhaps at a different frequency: W band)