Technology Development Telecon - (DR) Detector, Readout

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Charge to CMB-S4 Technology Development Working Group

In the first edition of the Technology Book, the experimental CMB community summarized the current state of CMB technology and evaluated its current technical readiness with a 5-level Technology Status Level (TSL) and manufacturing readiness with a 5-level Production Status Level (PSL). For each technology, we identified Technology Development (TD) efforts necessary to advance it for possible use in CMB-S4. As a next step of the collaborative community wide effort, the CMB-S4 TD prioritization working group will evaluate TD topics based on impacts they have on cost, schedule, and science return. By the time of the Argonne meeting (March 2018) the working group will produce a prioritized list of the TD topics that the community should pursue to ensure timely maturity of technologies that will enable the successful advancement of the project.

We have grouped the relevant technologies into the following areas to tackle this immense task: Telescope and Site; Cryogenics, Cryostats and Optics; Detectors and Readout; and Data Management. Calibration of evaluation metrics across the subgroups is important for fair comparison of the TD topics. In addition, many TD topics are inter-dependent. To capture these ideas, the overall working group will communicate across all the subgroups in monthly combined group meetings.

The scope of each subgroup is as follows:

  • Telescope and site: Covers telescope, mount, site, power generation, etc...
  • Cryogenics, cryostats and optics: Covers cryogenics (4K and mK), cryostats, windows, filters, lenses, HWP etc...
  • Detector and readout: Covers detector (detector array and holder) and readout (warm/cold), etc...
  • Data management: Covers DAQ, data transfer, simulation, analysis, publication, etc...

Tab-Separated Table


  • October (combined call on Nov 2)
    • Define baseline to compare impact of R&Ds to
    • Start populating list of R&D item and do evaluation on some entries
    • Make modification/improvements to organization method if necessary
  • November (combined call on Nov 30)
    • Continue to populate and evaluate list of R&D items as sub-group
    • Draft list by end of month
    • evaluation may not be complete by this time
  • December (combined call on Dec 28)
    • Sub-group list with priority evaluation by end of month such that we can start combining lists in 2018
  • January (combined call on Feb 1, maybe more combined call)
    • Start normalization/ combine lists from different groups
    • Draft of combined list by end of month
  • February (combined call on March 1, maybe more combined call)
    • Modify/fine tune combined list
    • Discuss on what we’ll show at CMB-S4 workshop at ANL
  • March
    • CMB-S4 workshop at ANL: Present at CMB-S4 meeting

CMB-S4 Technology Development Telecon 2017-11-16 Subgroup Meeting: Detector/Readout

CMB-S4 Technology Development Telecon 2017-11-09 Subgroup Meeting: Detector/Readout

  • Agenda
    • review of CDT report regarding detector / readout
    • nominal schedule and impact on TD
    • discussion of ‘baseline’ necessary for TD
  • Notes
    • Spent most of meeting going through meeting slides to discussion sections of CDT report relevant to detectors / readout
    • Toki pointed out that UMUX readout is called out as an existing readout technology, but MKIDs not as an existing detector. Tom noted that both MKIDs and UMUX are listed as potential TD topics for either reduce risk or baseline cost
    • Toki asked if testing costs are in the straw person cost estimate. Tom will reach out to Steve Padin for clarification.
    • It was noted that there is a discrepancy in the number of frequency bands used between the table and text in the CDT report.
    • Clarance noted that we need to reach out to the other groups when discussing the baseline so that our plans do not diverge. Toki will reach out to the forecasting group. Tom will reach out to the cryo group.
    • Clarence noted that when thinking about mux factors we also need to think about issue such as thermal loading. In general we need to maintain communication between the groups to ease convergence on baseline that is realistic from the prospective of each sub group.
    • The last portion of the meeting was spent discussing Tom's draft baseline. This currently lives in the google doc at the link below. Tom will copy it over to the main google doc (Main TD doc) listed below during the next week.
  • Files / links

CMB-S4 Technology Development Telecon 2017-10-26 Subgroup Meeting: Detector/Readout

  • Note
    • What should we target for R&D plan?
      • Notional schedule was presented at CMB-S4 meetings and design concept is presented by CDT report.
      • For example "2020+n years" for CD-0 which is "Mission Need", then within few years we'll have technology down select, and we need to finalize design by CD3 when we start cutting metal

CMB-S4 Technology Development Telecon 2017-10-19 Subgroup Meeting: Detector/Readout

  • Agenda
    • General discussion of charge, prioritization methods, schedule.
    • Brief updates from each of the subgroups.
    • Discuss goal for next combined telecom.
  • Notes
    • Detectors/readout subsheet subleads;
      • Detectors (Toki/Tom)
      • Readout (Shawn/Amy)
      • and Characterization (Patty).
    • Strategy for converting risk into TD topic; ask “what TD could mitigate this risk.”
    • TD sub-leads will work to better organize common TD topics into groups using new “TD details” column of detector/readout subsheet. Will also think about/explore other ways of organizing the ideas in our sheet and report back to Toki/Zeesh.
    • Tom suggests that to help generate ideas we all ask ourselves “What went wrong in the last year, and what TD could help mitigate that”?
    • Optics means HWP, lenses, filters, etc. Things like lenslets, horns, etc.

belong in detector/readout subsheet.

  • Action Items
    • For group; by 11/2 combined call: List of TD topics (just ideas in column C).
    • For group; by 11/30 combined call: Add short descriptions to all entries. These descriptions will be sharpened into impact/cost/etc.
    • Tom/Toki/Shawn/Amy/Patty will reach out to folks to push people to get ideas in the detectors/readout sheet before next combined call (Nov. 2).

CMB-S4 Technology Development Telecon 2017-10-05 Subgroup Meeting: Detector/Readout