GBT Focal Plane Array Development Program Steven White

GBT Focal Plane Array Development Program Steven White Program Manager

Personnel n n n Jay Lockman and DJ Pisano, Project Scientist Steve White, Project Manager Matt Morgan, Project Engineer Kamaljeet Saini and 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 Dennis Egan, Component Construction John Ford and Galen Watts, M&C Hardware Design

K band Justification n Science workshop determined efficiency improvements necessary for K Band: weather, observing requests, mapping programs. n Lockheed-Martin funds made available for new projects. A proposal for a full 61 pixel K band receiver requiring a new spectrometer and IF system submitted. n 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. n n n $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. n n Seven pixel array construction by June, 2009 Production use by November, 2010.

Purpose of Review n Does the seven pixel FPA design concept specify an instrument that will accomplish science objectives? n Are the system specifications sufficient and complete? Do the component designs comply with the system specifications? n Is the seven pixel receiver design expandable to ~61 pixels? n Is the schedule achievable, project plan reasonable, and commissioning plan reasonable? n Is the software development and data analysis approach reasonable and expandable for the FPA program.

K-band FPA Deliverables n n Frontend n Cryogenic Package n Modular Downconverter n Modular Noise Calibration n Mechanical Packaging Software n n Package for Engineering and M&C Package for data analysis Cost per channel. Canadian Collaborations enhance capabilities with additional data analysis software. Provide a spectrometer around time of commissioning seven pixel instrument.

Milestones n n n 02/28/08 Conceptual Design Review acceptance. 05/08/08 Single Pixel Construction Complete 05/13/08 M&C Hardware Module with support software complete. 08/08/08 Single Pixel Testing Complete: Critical Design Review acceptance. 01/06/09 Multi-pixel Dewar Assembly complete. 02/13/09 Observing Support software complete. 06/09/09 Multi-pixel Testing Construction complete. 11/03/09 System Integrate & LAB Test complete. 02/18/10 Data Analysis software complete 04/06/10 Telescope Testing complete. 11/08/10 Commissioning complete.

Compromises n n n What feed location can be sacrificed for bracing, refrigerator installation? Shifting the band to higher frequencies increases costs and impacts schedule. (Isolator NRE and development) What is the best arrangement, missing elements?

Future FPA Developments n Significantly enhanced spectrometer with this new array and existing IF system. (Canadian Collaboration with Letter of Understanding) n New digital I. F. distribution system. (Spectrometer and technology dependent). n Expanded focal plane array (perhaps at a different frequency) n Phased, expandable software development to match hardware capabilities. (Canadian Collaboration with Letter of Understanding)