LFI Integration and Test Support

1. LFI Integration and Test Support

2. LFI Radiometer Hardware Flow

3. US team • Rodrigo Leonardi-UCSB • Summary(final) analyses of 30, 44 and 70 GHz RCA tests, QM and FM • Development of dedicated IDL tools for instrument characterization • Testing of ‘LIFE’ software and contributions to LIFE modules • Testing of KST with RCA and RAA data. • PRM-UCSB • Chairing 70 GHz ‘support tiger team’- technical support team • Critical analyses of all phases of test data • Test set and radiometer troubleshooting (remote and on site in Helsinki, JBO and Milan) • Primary contact with European instrument team. • Todd Gaier-JPL • RF devices, export issues, NGST contacts • RCA troubleshooting • Michael Seiffert-JPL • Detailed RCA modeling • Test analyses • LFI System analyses and debugging/systematic effects

4. Achievements past year • The US role has been to provide experience and scientific input to the nuts and bolts of the Radiometer test campaigns. Our contributions focus on • Making sure test campaigns cover critical measurements:developing test procedures. • Developing analysis tools and metrics to determine radiometer performance • Cross checking test data sets independently • Diagnosing and helping solve problems with radiometers and test systems: Thermal, Electrical, RF and software. • Assisting onsite at JBO, Ylinen electronics and Laben in RCA and RAA test campaigns • Built a simulator using test data for developing real-time analysis tools and daily reports, demonstrated KST capabilities for some LFI data analysis, participated in testing and development of LIFE analysis tools • Developing detailed summary of final test data for LFI Instrument Model- input to Level S and pipeline • We identified and helped solve a number of major problems at QM and FM, RCA and RAA levels, some samples: • Noise resolution issues with 30/44 GHz QM and particularly with the 70 GHz FM RCA test campaigns • Debugging of initial LFI RAA data streams, filtering errors and EMC. • Investigation into ‘spikes’ in 70 GHz RCA RM and RAA QM data sets. • Oscillation problem 44 GHz Back End Modules. • Publications on LFI I+T campaigns (Bersanelli et al, Menella et al, Tomasi et al) include US team.

5. European connections • Major advances in the past year in interfaces within LFI • Multiple visits to Laben, Helsinki, JBO • Use of common tools (LIFE) across LFI to analyze common data sets • Readily available data from all test campaigns via FTP • Weekly telecons, web logs and active email communications • Large increase in sophistication of the whole LFI instrument team • Multiple analyses of current data sets occur (typically Bologna, UCSB, Helsinki) • Distribution of instrument experience around the team (Torsti Poutanen, Maura Sandri, Luca Terenzi, Francesco Cuttaia, Paola Battaglia, Mikko Laaninen . ..many more.)

6. Plans for Next Year • Support LFI FM RAA campaign about to start in Laben. • PRM to spend 1-2 weeks, RL hopefully much more • Near real time remote analysis at both JPL and UCSB, primarily noise performance estimation and troubleshooting. • Development of tools for realtime reporting, to be extended for flight operations. • We will support the Alcatel test phase as well in similar fashion. • Analysis of ground test database • Some anomalies still being investigated. • Critical analysis of bandpasses particularly 70 GHz) and calibration • Development of a complete integrated picture of the instrument, for the instrument model and pipeline analysis. • Work with Italian team to develop CPV phase plans and inflight tuning methods • Parallel effort to integrate instrument experience in LFI pipeline development • Systematic errors, Calibration issues, Polarization calibration, offsets etc • Instrument model • Reporting and simulation • Significant effort to maximize overlaps with US HFI instrument team