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datachallenge

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Data Challenges

These data challenges are in support of the study of the imager option for a Probe-class CMB mission. We will use it as a check on analytic forecasts, and to further optimize the baseline design.

We are at the very beginning stages of defining this data challenge. Nothing written here should be understood as finalized. Please feel free to contribute to the definition of the data challenge.

Following the model used in CMB-S4, we will define Data Challenge X.Y as the application of Mission Model X to Sky Model Y. We anticipate the first iteration (DC_0.0) to be available in mid-July. This will primarily be a test case for the construction and analysis processes, with more detailed and representative models to follow.

Links to the details of specific mission and sky models are provided below.

Data will be made available at NERSC at /project/projectdirs/cmbp

To obtain a NERSC account please go to http://crd.lbl.gov/cmb to sign-up, using repository mp107 and PI Borrill.

Mission Model

A mission model includes an Instrument Model and an Observation Model

Instrument Model

A basic instrument model will include specification of each frequency band:

  • Center and width
  • Angular resolution
  • Sensitivity

An advanced instrument model will also include:

  • Focal plane layout
  • Noise model for each detector

Observation Model

An observation model defines the scanning strategy

  • Spin access
  • Spin rate
  • Precession axis
  • Precession rate
  • Survey duration

and any polarization modulation

  • HWP rotation rate or stepping frequency and angle

Given an observation and an advanced instrument model, we will use the TOAST tools to generate simulated hit and noise maps.

Mission Model 0

Mission Model 1

Mission Model 2

Sky Model

A sky model comprises four elements:

  • Scalar, tensor and non-Gaussian CMB
  • Extragalactic foregrounds
  • Galactic foregrounds
  • Zodiacal emission

Sky Model 0

Sky Model 1

Sky Model 2

datachallenge.1499904024.txt.gz · Last modified: 2017/07/12 19:00 by borrill