Cosmological parameters from CMB data T8 Home Page从CMB据T8主页宇宙学参数.pptVIP

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Cosmological parameters from CMB data T8 Home Page从CMB据T8主页宇宙学参数.ppt

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Cosmological parameters from CMB data T8 Home Page从CMB据T8主页宇宙学参数

Future Ground-based CMB SZ Interferometry (and some developments for mm spectroscopy)? Sarah Church Stanford University/Kavli Institute for Particle Astrophysics and Cosmology on behalf of the MAS/CHIP/SZI working groups Nov 22nd 2008 Enabling Technology: JPL development of MMIC modules based on low-noise InP amplifiers Scalable W-band MMIC Array Goal is scalability and versatility CMB Polarization Science The QUaD experiment (Church US PI, Gear UK PI)? The QUaD people Lessons from QUaD -- systematics Gain mismatches between two detectors differenced to measure Q or U Pointing mismatches between two detectors that are differenced to measure Q or U Cross-polarization at the few percent level Long time constants that are not pure exponentials Ground pickup in sidelobes Beam width uncertainty limits high-l measurements Every single one of these effects required many months of modeling to mitigate and usually required “unfixable” data to be discarded We need to pay close attention to the design Measuring E and B with QUaD detectors Trench removes 1/f noise from atmosphere and detectors and ground pickup (telescope sidelobes)? QUaD -- Contamination visible in Fourier Plane 1/f noise from atmosphere and detectors Ground pickup (telescope sidelobes)? Why Interferometers are especially well suited to CMB measurements All 4 Stokes parameters are simultaneously measured in Fourier space Time-dependent drifts are strongly rejected and dont generate false low-l data (key for B-mode measurements)? Can use corrugated feedhorns with very low sidelobes Low resolution spectroscopy (4-5 GHz sub bands) can help to distinguish foregrounds Previous CMB interferometers Projected sensitivity to Stokes parameters of InP amplifiers on ground-based expts Large-format interferometer enabled by scalable technology Strawman CMB Interferometer 100 dual-polarization pixels with corrugated feed horns in a close-packed array – basic unit Shortest baseline 7? (small horns!)?. Entire array