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QUIET Experiment

QUIET Experiment. Rencontres de Moriond 2010 March 14 th , 2010. Akito KUSAKA (for QUIET collaboration) University of Chicago, EFI and KICP. Outline. What’s QUIET Target Collaboration Site and Instrumentation Observing and analysis Future plan: QUIET phase-II. QUIET experiment.

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QUIET Experiment

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  1. QUIET Experiment Rencontres de Moriond 2010 March 14th, 2010 Akito KUSAKA (for QUIET collaboration) University of Chicago, EFI and KICP

  2. Outline • What’s QUIET • Target • Collaboration • Site and Instrumentation • Observing and analysis • Future plan: QUIET phase-II

  3. QUIET experiment

  4. What is QUIET? • Ground based • CMB polarization • Target: l~100, primordial B-mode • Phase-I: currently observing • Phase-II: being proposed

  5. QUIET collaboration Manchester Oxford Chicago (KICP) Fermilab Oslo MPI-Bonn Michigan Stanford (KIPAC) KEK Caltech JPL Columbia Princeton Miami Observational Site Chajnantor Plateau, Chile 5 countries, 14 institutes, ~35 scientists

  6. Collaboration meeting at Fermilab, June 2009

  7. What QUIET aims for? Map precision on 1x1 degree pixel: Planck: 1 K (100 GHz) QUIET Phase-I: ~1mK (40GHz) QUIET Phase-II:10-1K (90GHz) Phase-I: already as deep as Planck Phase-II: x10 deeper than Planck

  8. Chajnantor Plateau, Chile 5200 m Extremely low moisture ~1 hour drive from San Pedro de Atacama Year-round access Observing throughout the year (day and night) Where it is?

  9. QUIET Time Schedule Development Q-band observing Q-band analysis W-band observing Phase-II 2008, October Q-band (40GHz) observing start 2009, July W-band (90GHz) observing start 2010

  10. Already better than WMAP Galaxy systematic effects not considered yet Preliminary WMAP 5 years

  11. QUIET – What does it looks like? Platelet Array Focal Plane (Receiver) 2nd Mirror Electronics Box Primary Mirror Mount

  12. What is great about QUIET? • One of the world best polarimetor arrays • W-band (90GHz): 90 element, ~60mK s1/2 • Q-band (40GHz): 19 element, ~70mK s1/2 • Unique HEMT amplifier technology • Frequency: 40GHz+90GHz (uniqueness in foreground treatment), +30GHz in phase-II • Different systematics from bolometer exps.

  13. Key Technology:Polarimeter on Chip L-R decomposition OMT HEMT Module “Polarimeter On Chip” Key technology for large array (JPL) c.f. CAPMAP polarimeter ~3cm ~30cm

  14. W-band Array Array sensitivity ~60 mKs The world largest HEMT array polarimeter

  15. Observing and Analysis

  16. QUIET observing

  17. In real world: data selection Good weather Extremely bad weather Impossible to simulate the bad weather Big effort required to guarantee the data quality

  18. Null tests • Divide data set into two subset. • Reasonable divisions (e.g. good/bad weather) • Maps: m1 and m2 • “CMB power” for the map m1 – m2 • Heart of blind analysis

  19. Q-band Monte Carlo simulation Expected result • B-mode • Q-band close to world best. • W-band will be the world best Q-band (already collected) W-band

  20. (Near) Future

  21. QUIET Phase-II (x16 scale up!) 499-element array (x3) Phase-I W-band 91-element array

  22. Expected Sensitivity E-mode: High S/N measurement up to l~2000 B-mode: Detection or significant limit on r, detection of lensing r~ 0.018 Lensing ~ 35 Smn < 0.3eV

  23. Summary • QUIET • HEMT array polarimeter receiver: a unique choice of technology • Primary target is l~100 primordial B-mode • Phase-I • Q-band receiver has already collected ~4000 hours of data. Analysis in progress. • W-band data taking is continuing • Phase-II • Factor ~20 scale-up of phase-I • Technology, Site, Observing: All proven at phase-I

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