1 / 10

Injecting W-band power (from Gunn oscillator) into QUIET receiver module

Status of QUIET-II at Fermilab. Fritz DeJongh , Scott Dodelson , Donna Kubik , Hogan Nguyen, Albert Stebbins FCPA Retreat May 13 th , 2011. KEK and Fermilab Collaborating at Lab 3. Injecting W-band power (from Gunn oscillator) into QUIET receiver module. Announcement of Q-band

kenaz
Download Presentation

Injecting W-band power (from Gunn oscillator) into QUIET receiver module

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Status of QUIET-II at Fermilab Fritz DeJongh, Scott Dodelson, Donna Kubik, Hogan Nguyen, Albert Stebbins FCPA Retreat May 13th, 2011 KEK and FermilabCollaborating at Lab 3 Injecting W-band power (from Gunn oscillator) into QUIET receiver module

  2. Announcement of Q-band (40 GHz) Result Fermilab Wine & Cheese A. Kusaka March 4th 2011 QUIET-I Highlights 6 sigma detection of EE peak at 1.2 degree angular scale (confirms BICEP with less data, at different freq) See 3σ evidence of Synchroton Foreground in 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-channel calibration and gain tracking worked very well. Important tool for monitoring W-band detector performance. 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.

  6. First Receiver Noise Temperature Measurement at Fermilab (a.k.a. Y-factor Measurement) Detector Output (arbitrary units) Different Amplifier Gain Settings Good Agreement with Caltech-JPL Measurements Receiver Noise Temperature appears to be in good control for this chip design. Black Body Temperature(Kelvins) 6

  7. First Sensitivity Measurements at Fermilab (KEK + Fermilab) Noise Power Spectrum (1/f noise has been cancelled) Sensitivity ~ 1.75 mK-sec1/2 * This module failed other quality cuts... was not installed into QUIET-1 array Frequency [Hz] Frequency Noise Power

  8. Maximizing the Module Sensitivity Reduce 1stAmplifier’s Noise to ~ 50K, and increase BW 0.25 mm 0.75mm Replace Lossy Passive Planar RF Structures with Pure Waveguide Improve DC Amplifiers down stream of Detector Diodes (RF DC converter)

  9. Component Design and Fabrication Caltech/JPL Manchester SLAC/Stanford Fermilab Electronics KEK and Chicago Testing CIT, KEK, Chicago/Fermilab QUIET-II ModuleNew Design Prototype for QUIET-II Detector Diode Housing provided by Fermilab (RF  DC converter)

  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.

More Related