1Injecting W-band power (from Gunn oscillator)

into QUIET receiver module

KEK and Fermilab Collaborating at Lab 3

Status of QUIET-II at Fermilab

Fritz DeJongh, Scott Dodelson, Donna Kubik, Hogan Nguyen, Albert Stebbins

FCPA Retreat May 13th, 2011

2

QUIET-I HighlightsAnnouncement of Q-band(40 GHz) Result

Fermilab Wine & CheeseA. KusakaMarch 4th 2011

6 sigma detection of EE peak at 1.2 degreeangular scale (confirms BICEP with less data, at different freq)

See 3σ evidence of Synchroton Foregroundin a supposedly clean patch of sky

Limit on B mode (r < 2.2)

Lowest published systematics(rsys ~ 0.1)

3

QUIET-I Highlights (with Emphasis on Fermilab)

Large Sparse Wire Grid Concept for channel-to-channelcalibration and gain tracking worked very well.

Important tool for monitoring W-band detectorperformance.

W-band Data Analysis

Detector Noise Monitoring(Kubik)

Detector Calibration using Moon Signal(Nguyen)

4

Main QUIET-II Detector R&D Program Goal: Maximize Raw Sensitivity

Figure of Merit (to good approximation):

Receiver Noise Sensitivity [K-sec1/2] = Temperature [K]

(Bandwidth [Hz])1/2

or equivalently

White Noise Sensitivity [K-sec1/2] = [mV - sec1/2]

Gain [mV/K]

W-band Noise Per Module

Quiet I 500 μK-sec1/2

Quiet-II (goal) 200 μK-sec1/2

5

QUIET 1 Module in Cryostat at Lab 3

* This module didn’t pass quality cuts. Was not installed in QUIET-I array.

6Black Body Temperature (Kelvins)

6

First Receiver Noise Temperature Measurement at Fermilab (a.k.a. Y-factor Measurement)

DetectorOutput(arbitraryunits)

DifferentAmplifierGain Settings

Good Agreementwith Caltech-JPLMeasurements

Receiver Noise Temperatureappears to be ingood controlfor this chip design.

7

First Sensitivity Measurements at Fermilab (KEK + Fermilab)

Sensitivity ~ 1.75 mK-sec1/2

* This module failedother quality cuts... was not installedinto QUIET-1 array

Noise Power Spectrum (1/f noise has been cancelled)

Frequency [Hz] Frequency Noise Power

8

Maximizing the Module Sensitivity

Replace Lossy Passive Planar RF Structures with Pure Waveguide

Reduce 1st Amplifier’s Noiseto ~ 50K, and increase BW

0.75mm

0.25 mm

Improve DC Amplifiers down stream of Detector Diodes(RF DC converter)

9

QUIET-II Module New Design Component Design and Fabrication

Caltech/JPLManchesterSLAC/StanfordFermilab

ElectronicsKEK and Chicago

TestingCIT, KEK, Chicago/Fermilab

Detector Diode Housingprovided by Fermilab(RF DC converter)

Prototype for QUIET-II

10

Towards QUIET-II

• The death of Bruce Winstein was a huge loss.

• QUIET-II proposal was turned down by NSF. Cost of ~$20M is main issue.

• Funding for QUIET-II R&D to improve modules and reduce cost.

- KECK Space Science Institute grant to fund Caltech Cahill Lab - Stanford (2nd year of NSF ATI Grant) - Foreign Contributions ( KEK and Manchester) - Caltech-led NSF-ATI Grant was turned down in April 2011. - Chicago PFC Proposal (contains funding for HEMT R&D) is awaiting final decision. - Fermilab KA13 (0.2 FTE) and KA15 (0.5 FTE and M&S)

• PI’s are meeting in late May at JPL. Topics for discussion:

- When to resubmit for Phase II - New Spokesperson - Possible low-cost intermediate experiment before Phase II.