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The Atacama Cosmology Telescope

The Atacama Cosmology Telescope. New Views of the Universe. Joe Fowler Princeton University. December 11, 2005. ACT: The Big Idea . Goal: map ℓ>1000 CMB anisotropy in 3 colors (1-2 mm) Study the primary CMB power spectrum Survey for S-Z clusters Follow clusters in optical & X-ray

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The Atacama Cosmology Telescope

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  1. The Atacama Cosmology Telescope New Views of the Universe Joe Fowler Princeton University December 11, 2005

  2. ACT: The Big Idea • Goal: mapℓ>1000 CMB anisotropyin 3 colors (1-2 mm) • Study the primary CMB power spectrum • Survey for S-Z clusters • Follow clusters in optical & X-ray • Address Dark Energy in the “recent” universe, structure formation, inflation…

  3. Columbia U Mass Princeton Penn Toronto Católica CUNY Haverford ACT Institutions

  4. Current CMB Power Spectrum Next big question: ns scalar spectral index. It comes from the overall slope of the power spectrum. Small-angular scale measurements are essential.

  5. Signature in a Blind SZ Survey 145 GHz decrement 220 GHz null 270 GHz increment 1.4°x 1.4°

  6. CMB after WMAP: Arcminute mm Surveys 150 GHz 1.4° (~2% of high quality area) MBAC on ACT 1.7’ beam w/ noise SZ Simulation PLANCK

  7. Atacama Cosmology Telescope 6 meter primary Entire telescope scans in az Preliminary designs by AMEC

  8. Telescope under construction AMEC Dynamic Structures near Vancouver, B.C.

  9. Making CMB Maps • Scan strategy: constant elevation • Aim: deep 100-200 deg2 map • Atmospheric gradient of 65 mK across field 2° full range

  10. Cross-Linked Scans Each spot observed in 2 distinct stripes: before and after meridian crossing (green, red) Dec  R.A.

  11. ACT Survey Strip: 55 degrees south

  12. Chilean Atacama Desert Cerro Toco site: >5000 meters

  13. 1.2° square on sky Cold Reimaging Optics (n=3.41) 6m + 2m mirrors Map of Strehl ratio: black=diffraction-limited; red=95%

  14. TES Pop-up Bolometers 3.5 cm 1x32 TES Chip (unfolded) TES Shunt Resistors + Nyquist Inductor SQUID Multiplexer Aluminum on Silicon Circuit Pop-up geometry permits close packing in focal plane.

  15. Bolometer Array Camera • 145, 220, 270 GHz • Each a 32x32 array • Close-packed • Free space coupling • Mo-Au TES detectors • Developed by GSFC and NIST

  16. ACT Progress • Engineering units being studied now • Sky testing with prototype camera began this autumn • Field ACT in 2006, full camera ≤3 years WMAP optical mockup

  17. Saturn Unauthorized! Saturn observed 4 days ago at 2mm wavelength with TES + SQUID MUX camera. Map=8 minutes, 1 detector.

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