quiet experiment
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
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QUIET ExperimentRencontres de Moriond 2010
March 14th, 2010
Akito KUSAKA(for QUIET collaboration)
University of Chicago, EFI and KICP
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Outline What’s QUIET
› Target› Collaboration› Site and Instrumentation
Observing and analysis Future plan: QUIET phase-II
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QUIET experiment
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What is QUIET? Ground based CMB polarization Target: l~100, primordial B-
mode Phase-I: currently observing Phase-II: being proposed
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QUIET collaboration
CaltechJPL
Stanford(KIPAC)
Miami
Chicago (KICP)Fermilab
ColumbiaPrinceton
ManchesterOxford Oslo MPI-Bonn
KEK
5 countries, 14 institutes, ~35 scientists
Michigan
Observational SiteChajnantor Plateau, Chile
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Collaboration meeting at Fermilab, June 2009
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What QUIET aims for?
Map precision on1x1 degree pixel: Planck: 1 K (100 GHz)QUIET Phase-I: ~1K (40GHz)QUIET Phase-II:10-1K (90GHz)
Phase-I: already as deep as PlanckPhase-II: x10 deeper than Planck
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Where it is? 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)
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QUIET Time ScheduleDevelopment
Q-band observing
W-band observing
Phase-II
2008, OctoberQ-band (40GHz)observing start
2009, JulyW-band (90GHz)observing start
2010
Q-band analysis
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Already better than WMAP
Galaxysystematic effectsnot considered yet
WMAP 5 years
Preliminary
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QUIET – What does it looks like?
Primary Mirror
2nd Mirror
Mount
Focal Plane(Receiver)
ElectronicsBox
PlateletArray
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What is great about QUIET? One of the world best polarimetor
arrays› W-band (90GHz): 90 element, ~60K s1/2
› Q-band (40GHz): 19 element, ~70K s1/2
Unique HEMT amplifier technology› Frequency: 40GHz+90GHz (uniqueness in
foreground treatment), +30GHz in phase-II
› Different systematics from bolometer exps.
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Key Technology:Polarimeter on Chip
~3cm
L-R decomposition
“Polarimeter On Chip”Key technology for large array (JPL)
OMT
~30cm
c.f. CAPMAP polarimeter
HEMT Module
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W-band Array
The world largest HEMT array polarimeter
Array sensitivity~60 Ks
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Observing and Analysis
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QUIET observing
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In real world: data selectionGood weather Extremely bad weather
Impossible to simulate the bad weatherBig effort required to guarantee the data quality
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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
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Expected result B-mode
› Q-band close to world best.
› W-band will be the world best
Q-band(already collected)
W-band
Q-band Monte Carlo simulation
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(Near) Future
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QUIET Phase-II (x16 scale up!)
Phase-I W-band91-element array
499-elementarray (x3)
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Expected Sensitivity
E-mode: High S/N measurement up to l~2000B-mode: Detection or significant limit on r, detection of lensing
r ~ 0.018Lensing ~ 35 S mn < 0.3eV
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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