Joint Plenary for Forecasting/Reference Design
From CMB-S4 wiki
Questions: What plans for instrument systematics modeling on the decadal timescale and beyond? What instrument parameters values should we use, guided by simulations & experience?
- Complementary performance-based and ab initio forecasting
- Write down specs for eg. bandwidth, NET, etc, justified by demonstrated performance
- Need single reference document for all of these (wiki page? google sheet?)
- Organize by subsections of CDR reference design chapter
- Incorporate requirements & achieved values from S3 experiments
- Include links to S3 references
- "Are we done? What next?"
- Cascade diagram progressively decomposing each element
- For many boxes there are uncontroversial numbers that can be used as the starting point
- On which parameters do we need to do better than S3 to achieve our goals?
- CDT framework provides maxima for eg. additive contamination
- see CDT report appendix A, wiki links & forecasting paper in progress
- Track propagation of systematic from source to power spectra to identify scaling with eg. number of detectors
- What's going to be hard?
- Beams, beams, beams & beams
- Bandpass mismatch
- Polarization calibration
- Readout electronics stability
- Big arrays won't necessarily integrate down as we might hope
- Prioritize effects that need to be addressed - things that can either be checked-off fast or are highest risk/reward
- Need to avoid telecon proliferation
- Small group to lay out spreadsheet (Zeesh, Colin, ... ) & call telecon(s) only as needed
- Add tab to John Ruhl's spreadsheet & require login to edit
- Identify key contact point(s) in each S3 experiment
- Detector fab questions:
- Current approach scales from B/K - how representative of S4 fab will this be? Yield, scatter, ...
- Need flow down to factors that inform NET, including spread (with frequency)
- Use best B/K as credible target
- Identify things could be legitimate improvements
- Base temperature
- Increased duty cycle from dilution refrigeration
- Hold these as margins?
- Detector count is the special case!