Telecon 20170828

Agenda:

• Where we are (Shaul) (.pdf)
• Scan Angles (Kris) (.pdf)
• Noise model Noise model status (.pdf) (Karl)

Notes: Attending: Shaul, Amy, Brian, Kris, Julian, Karl, Qi, Brad, Roger, Jacques, Bill

pre meeting comments:

• Roger working on getting FDM power consumption and 1/f characteristics from Matt Dobbs.

Current status (Shaul)

• flow chart indicates various areas of work and
• Preliminary, to see where we are and illustrate how different parts interact

Noise Model (Karl)

• White noise level only.
• NEPs and NET have been calculated
• Readout was from EBEX, more information of readout system is needed for estimation of noise in near future
• Photon correlation noise = 1
  1. probably needs to be investigated
  2. different for space and ground-based missions
• Thermal power law index n: 2 is more proper
• Zodiacal light might be included
  1. negligible in terms of loading from simulation (Jacques)
  2. galaxy also negligible in terms of loading
• 10 ms bolo time constant does NOT matter here
• P_readout > P_photon at lowest bands near 20 GHz
• Next steps:
  1. go from single detector —> multi-chroic —> full focal plane
  2. Roger to use his model to calculate noise and cross check on 1 week timescale
• 1 / f needs to be modeled as well
  1. Roger will lead collection of information, check in at 2 weeks.
  2. Julian has machinery to simulate given a noise spectrum.
• correlated noise will need more inputs
  1. data from Plank for satellite related issues
  2. data from SPT, BICEP, etc for crosstalk numbers.
• for TDM capacitance of wiring is critical to limit noise
  1. what are key points for FDM?

Scanning (Kris)

• basic model of single pixel with completely smooth scan.
• ability to reconstruct polarization maps looks reasonable, but Kris not convinced
  1. more complete models with multiple detectors, and a plan for how to combine them is needed.
  2. some of the has been done for CORE and LightBIRD.
  3. Kris to look into these papers
  4. Jacques to ask European community what they can contribute and what time availability they have. ETA 1 week.
  5. Kris-Jacques will meet Sept. 18-19 to discuss face-to-face.