Reference design simulation tool

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October, 2019 - Data management group


Background

This page documents a simulation tool based on the reference design that allows users to explore how various design choices affect CMB-S4 maps. We use limited scope time domain simulations to build an archive of signal, noise and systematic maps that can be combined with appropriate weights to account for

  • observing efficiency
  • survey length
  • detector counts and sensitivity
  • telescope siting
  • levels of systematics


Specifications

  • Which resolutions to support?
  • Specify the reference design. What are the parameters to vary?


Schedule

  1. Focalplane geometry 11/15/2019
  2. Instrument noise model 11/08/2019
  3. Observing schedules chosen by 11/15/2019
  4. All inputs for TOD simulation in place by 11/15/2019
  5. Simulated component maps ready by 12/01/2019
  6. Simulation tool written, tested and delivered to the collaboration by 12/15/2019

Instrument model

Reference SAT

Describe frequencies and detector counts on the smallest independent unit (tube?).


Focalplane

Choose some representative geometry (hexagon?) for the independent unit.


Noise

What site and elevation-dependent noise model to use?


Reference LAT

Describe frequencies and detector counts on the smallest independent unit (tube?).


Focalplane

Choose some representative geometry (hexagon?) for the independent unit.


Noise

What site and elevation-dependent noise model to use?

Survey_Performance_Expectations


Scan strategy

The simulation requires specifying a scan strategy for each telescope and site considered.

Pole SAT

Pole delensing LAT

Chile SAT

Chile LAT

Sky signal

CMB

Foregrounds

Synchrotron

Free-free

AME

Dust

CO

CIB

Systematics

Atmospheric noise

Ground pickup

Data reduction

Data reduction must be linear. Each component will be processed separately.

Ground filter

Polynomial filter

Transfer function

Input archive

We'll use NERSC to host the input maps.


Software

Where do the scripts, parameter files and code go?