Difference between revisions of "Detector MUX/readout Notes"

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== Material ==
== Material ==
Meeting notes are available [https://docs.google.com/document/d/1n7IkO_6S85Cmyyt1khfYlYv1XJ85lPIbgd68QuRPjvI/edit?usp=sharing; here].
Meeting notes are available [https://docs.google.com/document/d/1n7IkO_6S85Cmyyt1khfYlYv1XJ85lPIbgd68QuRPjvI/edit?usp=sharing here].
TeX documents assembled by this group are available [https://github.com/CMB-S4/Memos/tree/master/Instrumentation/readout; here].
TeX documents assembled by this group are available [https://github.com/CMB-S4/Memos/tree/master/Instrumentation/readout here].

Revision as of 12:46, 26 July 2016

This page is for folks interested in detector and MUX/readout R&D for CMB-S4 to share documents, notes etc. outside of face-to-face workshops.

At the March 2016 CMB-S4 F2F meeting at LBNL, we started a small working group to assess the state of current detector readout technologies and identify R&D activities for CMB-S4 detector readout. Since then, the instrumentation working group has added detectors (downstream of RF coupling to absorber) to the charge of this group. The goal is to producing a white paper draft by the end of August 2016.

Logistical information

Meetings are every Tuesday at 11am Pacific are typically quick. Currently, we're in the process of writing first drafts of sections. Please subscribe to the S4_instrumentation mailing list for call information.


Meeting notes are available here.

TeX documents assembled by this group are available here.

White paper content

The content of the white paper will include the following. Note that this is not an outline. We will write an executive summary, introduction, organize appendices and other items to parallelize this with the papers from the other groups.

  • Detectors
    • Technologies to consider
      • Transition Edge Sensors (Clarence Chang, Suzanne Staggs)
      • Microwave Kinetic Inductance Detectors (Brad Johnson)
    • The present maturity and scalability to CMB-S4 of the following parameters should be considered for candidate detector technology
      • Response time (constrains scan strategy)
      • Stability
      • Noise performance - both white noise level and low-frequency noise performance (constrains scan strategy)
      • Signal bands (30-300 GHz)
      • Comments on performance at 100 mK and 300 mK.
    • Special considerations for the technologies
      • TES
        • Consider maturity & scalability in above parameters
        • Bias (AC/DC). Demonstrated performance, technical considerations of operation at different frequencies
      • MKIDs
        • Consider maturity & scalability in above parameters
        • Efficiency - both photon conversion efficiency and quasiparticle collection efficiency, and how they refer to NEP
        • Materials / gap frequency
  • Readout
    • Technologies to consider
      • Time Domain MUX (Jeff Filippini, Sarah Kernasovskiy)
      • Frequency Domain MUX (Darcy Barron, Matt Dobbs)
      • Microwave-interrogated technologies
        • MKIDs (Max Abitbol, Glen Jones, Brad Johnson)
        • Microwave SQUIDs (Hannes Hubmayr
    • Review
      • Description of components (cold, warm, interconnects)
      • Achieved MUX factors; heat loads
      • Noise, 1/f knee, Signal-noise correlations (xtalk)
      • Bandwidth, Stability
      • Power consumption - both cold and room-temperature electronics
    • R&D
      • Comments on applying technology as is. So MUX ~64.
      • Path to achieve MUX factors of ~125, 250 or 500, 1000 (as appropriate for technology)
      • Path to achieve other CMB-S4 specifications (We'll work on this after first round drafts)