Hi Jon, Grant, Kirit, and Immanuel, I've talked with each of you about the FTS measurements at Pole, which will start with B2 in early December. I just want to facilitate communication on this thread: Jon and Grant have volunteered to take the lead on B2 and Keck measurements, respectively. Immanuel will arrive at Pole ~Nov 5, and Kirit a week later--both will make completing FTS measurements and analysis their top priorities. Since this FTS will return to Harvard they should become expert in using it, and with Grant can hand it off to Abby and me in Jan for final Keck use and retro. We need to turn these data around as quickly as possible, verifying completeness of coverage on our ~250 light B2 detector pairs and data quality as judged by repeatability of conclusions. Our goal should be to take multiple sets of spectra on all B2 rgl's, with different FTS mounting orientations and/or grid polarizations, and verify repeatability of not just the spectra but the actual parameters we derive from them which we will use in analysis. These parameters should include *band centers* for an assumed source spectrum (e.g. CMB), and more importantly predicted *elnod relgain mismatch* as Evan calculated from B1 spectra in this posting. <http://bicep.caltech.edu/%7Ebicep/analysis_logbook_north/20101021_specleak3/> You could start working right now on the analysis that will be needed to derive these parameters from your spectra. A posting could demonstrate repeatability using scatter plots between two measurement sets, and plot significance assessed from scatter among measurements as in this recent posting <http://bmode.caltech.edu/%7Espuder/analysis_logbook/analysis/20121109_BeamParameters2/BeamParameters2.html> on beam parameters. Our goal is to see such postings before warming up B2. We'd like to aim for Dec 10. As you know, Dec 25 is the drop-dead deadline. Please work together, but don't be afraid to produce independent analyses of the same data--we need multiple team members on this to ensure timely convergence. John -- ___________________________________________________________________ John Kovacjmkovac(a)cfa.harvard.edu Assistant Professor, Astronomy and Physics, Harvard University 160 Concord Ave rm 310, Cambridge MA 02138, 617-496-0611