Bicep2-list February 2013

bicep2-list@lists.fas.harvard.edu

7 participants
14 discussions

Re: [Bicep2-list] [Bispud-pipeline-list] BICEP2 Team meeting tomorrow (05 Feb 2013) noon Eastern

by Clem Pryke

Hi Chris, Thanks for this summary. > In fact, the WMAP/B2 comparison looks to even *suggest* an unmodeled sidelobe. How so? You do not say that in the posting. If this claim is based on the rms being slightly higher in the upper left versus right panels of the last figure of that post you should fix the analysis to include the B2 noise as per our email exchange below. Clem Subject: Re: [Bicep2-list] elliptical sidelobes II From: Clem Pryke <pryke(a)physics.umn.edu> Date: Mon, 28 Jan 2013 03:42:26 -0600 To: Chris Sheehy <csheehy(a)uchicago.edu> Cc: pryke(a)physics.umn.edu Chris, [snip] In the second section I think you assume that the B2 noise is negligible - but I don't think you need to do this. The left column of the plots might just as well be (reobserved WMAP noise) - (B2 noise only sim) + sidelobe sim. I think this is the thing which should be statistically the same as the WMAP - B2 map at right on the assumption that the main lobe components of the maps are identical. Adding in this small B2 noise may make the upper left rms value closer to the 8.67uK at right. In fact there is still a wrinkle in this as the presence of the sidelobe would effect the abscal. Neither of these change the bottom line result which is that for a strong sidelobe we expect to see obvious increased large angular scale structure in the WMAP-B2 map. Clem Subject: Re: [Bicep2-list] elliptical sidelobes II From: Chris Sheehy <csheehy(a)uchicago.edu> Date: Mon, 28 Jan 2013 17:54:56 -0600 To: Clem Pryke <pryke(a)physics.umn.edu> Hi Clem, [snip] I agree with all that. I will try to fix that for tomorrow.Â -Chris -- ********************************************************************** Clem Pryke - Associate Professor - Physics University of Minnesota, Room 313 Tate, 116 Church Street S.E. Minneapolis, MN, 55455 Tel: 612-624-7578 Fax: 612-624-4578 email: pryke(a)physics.umn.edu **********************************************************************

11 years, 3 months

Re: [Bicep2-list] we can hear you

by John Kovac

On 2/6/13 7:16 AM, Zak Staniszewski wrote: > you cant hear us, but we can hear you. been like that for ~15 minutes. > we would love to make comments. please call back in. I'm glad you were still able to hear us--we were hoping so--but I know from our own recent experience how frustrating it can be when you are able to hear but unable to comment. As Clem wrote, despite our back-and-forth we are in strong agreement on the need to study all of our systematics, and specifically our un-deprojected residual beam mistmatch, in a systematic way that directly ties to how it enters in our actual CMB analysis and allows us to place upper limits on false B, Takahashi et al fashion. There is a specific path forward on doing this for beams. Whether or not the beams or any other systematic are the immediate long pole in our data, this is the approach our project needs. And at the same time we all should continue to think creatively about specific effects of any kind, in the instrument or analysis, that might yield the signature of jackknife passage and false B that we seem to be up against right now. John -- ___________________________________________________________________ John Kovac jmkovac(a)cfa.harvard.edu Assistant Professor, Astronomy and Physics, Harvard University 160 Concord Ave rm 310, Cambridge MA 02138, 617-496-0611 CURRENTLY AT SOUTH POLE STATION, ANTARCTICA

11 years, 3 months

BICEP2 telecon notes, Jan 22 2013

by Walt Ogburn

22 Jan 2013 BICEP2 weekly telecon On the line: Caltech: Randol, Jamie, Jeff, Kirit Harvard: Colin Minnesota: Chris NIST: Justus Stanford: Walt San Diego: Jon Pole: Clem, John, Stefan 1) General business (brief) - panlfs upgrade - slight additional risk of file corruption - AI: Inventory of disk usage [Walt] - AI: Colin to get current status from Paul - Unclear status of virtual machine. Colin to check. - online log for Nov/Dec data at Pole? [ Jon, Colin ] - Colin has made some progress - Jon to remove auto-generated entries - Authoritative copy on odyssey - Commit to aux_data [Colin] - getting BICEP2 summer data to Odyssey - Arrived - Colin to begin transfer 2) This week's report topic (~20-30 min) Walt: Low-level reduction and cuts http://bicep0.caltech.edu/~bicep2/papers/2013_firstresult/reduc/ - How to handle early 2010 data? Not contributing much weight... No additional work to keep it. No strong evidence that we need to cut it. Keep it. No action required. - End of 2010, early 2011 data: MCE butterworth filter incorrect. Suspect excess alias noise. Introduce manual cut to exclude that data. - AI: Walt/Angiola to write end-to-end description of low-level reduction as a draft of relevant section in paper - AI: Analysis required to show that transfer function is right. Justus is working on this. GCP data is available, MCE data is not. GCP is probably good enough for science band characterization. Takahashi et al. 3.1.1 is relevant reference for benchmark for characterizing transfer function. - AI: Randol to work with Jamie T and Colin to continue discussion about clearly defined cut thresholds and path forward. It’s okay if the answer is that it’s too much work for a first result. - Human eyeball review: Assignments exist - Walt to finish divying up - AI: Walt to update final live time and efficiency numbers Next week’s report: Main beam characterization [Randol] Two weeks from now: Thermal systematics [Jon]

11 years, 3 months

BICEP2 telecon notes, 29 Jan 2013

by Walt Ogburn

29 Jan 2013 BICEP2 weekly telecon On the line: San Diego: Brian, Angiola, Jon Stanford: Walt, Chao Lin Caltech: Jamie, Jeff, Randol, Roger Harvard: Colin, Chin Lin Minnesota: Chris Pole: Clem, John, Stefan 1) General business (brief) - panlfs upgrade Migration now [probably] complete. Week of downtime sometime in February - everyone will have two weeks notice. Replacement virtual machine up and running Long-term archival backup of arc files on tape - online log for Nov/Dec data at Pole? [ Jon, Colin ] Largely cleaned up - superfast data taking needs to be documented (Sarah), and yukical data sets still need to be documented Now CVS commited to BICEP2 aux_data - getting BICEP2 summer data to Odyssey data copying now in progress - “essentially done” John to hand-carry raid-array disks back from Pole. Will also copy contents of bicep32:/data/cryo separately 2) This week's report topic (~20-30 min) Randol: Main beam characterization http://bicep0.caltech.edu/~bicep2/papers/2013_firstresult/main_beam/ Four main goals: - pair sum quantities for final coadd (and beam centers) - pair diff parameters - amplitude and pol of unmodeled beam effects - comparison of measured beams with Zemax model South Pole has bad connection, unable to comment... New note with thermal, BBNS data and Zemax comparison http://bicep0.caltech.edu/~spuder/analysis_logbook/analysis/20130124_zemax_… AI: Plot C_l in addition to Cs_l in Fig. 5 AI: Plot Gaussian beam in Fig. 5 AI: In Fig. 2, overplot specific near sidelobe models Strange sign-flip of xtalk beams in plot linked under Fig. 4?? What is discrepancy in beam width between thermal & BBNS? (~10%) How to simulate unmodeled residuals? 3) updates on other threads (<20 min) - defer non-trivial discussion of new postings to pipeline telecon - “human eye review” of reducplots now in progress Unable to communicate with South Pole over bad connection - deferring pipeline items until we can reschedule

11 years, 3 months

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Bicep2-list February 2013