Simulations for configurations with different frequency coverage

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Summary

This posting describes simulations for four different configurations with 12 optics tubes but different frequency coverage. The configurations range from a charicature with 4 bands to the configuration with 9 bands that has been studied most extensively.

The counting of frequency bands includes the high resolution low frequency band on the delensing LAT. For this band the parameters are taken from the SAT survey 05 described in the posting Survey Performance Expectations, which differs somewhat from the parameters for the large area survey described in the same posting.

The bandwidth for all channels is as before and has been omitted from the table.

1000 simulations for each configuration with r=0 are available upon request. (There is currently not enough space in the project folder at NERSC...) All simulations are for the circular hits map used in previous studies. The simulations are based on the lensed and unlensed Planck FFP10 CMB realizations available at NERSC. The residual lensing amplitude is set to AL=0.082, which is based on the delensing forecasts for 7 years of observations with the delensing LAT for this circular mask. The foreground models considered are the PySM models a1d1f1s1, a2d4f1s3, a2f1d7s3 (models 01-03) and the first model based on MHD simulations (model 06). They are taken from the sky_yy folder at NERSC. The noise is generated according to the noise models described below and is characterized in the posting Characterization of simulations for configurations 30-33

The configuration numbers below (30-33) are chosen to clearly distinguish them from the main data challenge simulations (01-04). The sensitivities are obtained by rescaling the sensitivities for configuration 05 "S4 Pole — 7 years with 12 tubes of Config 5" described in the posting Survey Performance Expectations using the numbers of detectors and resolutions given in this spreadsheet. Noise maps for the associated noise spectrum are generated using synfast, then reweighted by the hits map and rescaled to achieve the desired normalization. The maps are filtered to remove large scale information.

Configurations

Configuration 30

This configuration relies on monochromatic detectors labeled option 3 in the spreadsheet. It consists of 2 optics tubes with 30 GHz detectors, 8 optics tubes with 95 GHz detectors, and 2 optics tubes with 270 GHz detectors.


Frequency (GHz) 20 30 95 270
Beam FWHM (arcmin) 11.0 72.8 22.7 8.0
white noise level TT (uK-arcmin) 16.55 5.31 1.09 11.21
ell knee TT 500 150 150 230
1/f exponent TT -4.4 -4.4 -4.4 -3.8
white noise level EE (uK-arcmin) 10.87 3.52 0.72 5.21
ell knee EE 200 60 60 65
1/f exponent EE -2.2 -2.2 -2.2 -3.1
white noise level BB (uK-arcmin) 10.23 3.32 0.68 5.08
ell knee BB 200 60 60 60
1/f exponent BB -1.7 -1.7 -1.7 -3.0
ell min 30 30 30 30
nside 512 512 512 512

Configuration 31

This configuration relies on monochromatic detectors labeled option 3 in the spreadsheet at 30 and 270 GHz and dichroic detectors at 95/155 GHz referred to as option 5. It consists of 2 optics tubes with 30 GHz detectors, 8 optics tubes with 95/155 GHz detectors, and 2 optics tubes with 270 GHz detectors.


Frequency (GHz) 20 30 95 155 270
Beam FWHM (arcmin) 11.0 72.8 22.7 22.7 8.0
white noise level TT (uK-arcmin) 16.55 5.31 1.26 2.94 11.21
ell knee TT 500 150 150 230 230
1/f exponent TT -4.4 -4.4 -4.4 -3.8 -3.8
white noise level EE (uK-arcmin) 10.87 3.52 0.83 1.36 5.21
ell knee EE 200 60 60 65 65
1/f exponent EE -2.2 -2.2 -2.2 -3.1 -3.1
white noise level BB (uK-arcmin) 10.23 3.32 0.79 1.34 5.08
ell knee BB 200 60 60 60 60
1/f exponent BB -1.7 -1.7 -1.7 -3.0 -3.0
ell min 30 30 30 30 30
nside 512 512 512 512 512


Configuration 32

This configuration relies on dichroic detectors labeled option 5 in the spreadsheet. It consists of 1 optics tube with 30/40 GHz detectors, 8 optics tubes with 95/155 GHz detectors, and 3 optics tubes with 220/270 GHz detectors. There is no reason not to increase the bandwidth slightly and make them 90/150 GHz detectors, but discussion about NET levels to use for these is still ongoing. With current numbers this would lead to a ~10% decrease in noise levels for 90/150 GHz


Frequency (GHz) 20 30 40 95 155 220 270
Beam FWHM (arcmin) 11.0 72.8 72.8 22.7 22.7 13.0 13.0
white noise level TT (uK-arcmin) 16.55 9.36 11.85 1.26 2.94 10.15 17.40
ell knee TT 500 150 150 150 230 230 230
1/f exponent TT -4.4 -4.4 -4.4 -4.4 -3.8 -3.8 -3.8
white noise level EE (uK-arcmin) 10.87 6.20 7.85 0.83 1.36 4.71 8.08
ell knee EE 200 60 60 60 65 65 65
1/f exponent EE -2.2 -2.2 -2.2 -2.2 -3.1 -3.1 -3.1
white noise level BB (uK-arcmin) 10.23 5.85 7.40 0.79 1.34 4.60 7.89
ell knee BB 200 60 60 60 60 60 60
1/f exponent BB -1.7 -1.7 -1.7 -1.7 -3.0 -3.0 -3.0
ell min 30 30 30 30 30 30 30
nside 512 512 512 512 512 512 512


Configuration 33

This configuration is "S4 Pole — 7 years with 12 tubes of Config 5" described in the posting Survey_Performance_Expectations. It relies on dichroic detectors labeled option 5 in the spreadsheet. It consists of 1 optics tube with 30/40 GHz detectors, 4 optics tubes with 85/145 GHz detectors, 4 optics tubes with 95/155 GHz detectors, and 3 optics tubes with 220/270 GHz detectors.


Frequency (GHz) 20 30 40 85 95 145 155 220 270
Bandwidth (GHz) 5.0 9.0 12.0 20.4 22.8 31.9 34.1 48.4 59.4
Beam FWHM (arcmin) 11.0 72.8 72.8 25.5 22.7 25.5 22.7 13.0 13.0
white noise level TT (uK-arcmin) 16.55 9.36 11.85 2.02 1.78 3.89 4.16 10.15 17.40
ell knee TT 500 150 150 150 150 230 230 230 230
1/f exponent TT -4.4 -4.4 -4.4 -4.4 -4.4 -3.8 -3.8 -3.8 -3.8
white noise level EE (uK-arcmin) 10.87 6.20 7.85 1.34 1.18 1.80 1.93 4.71 8.08
ell knee EE 200 60 60 60 60 65 65 65 65
1/f exponent EE -2.2 -2.2 -2.2 -2.2 -2.2 -3.1 -3.1 -3.1 -3.1
white noise level BB (uK-arcmin) 10.23 5.85 7.40 1.27 1.12 1.76 1.89 4.60 7.89
ell knee BB 200 60 60 60 60 60 60 60 60
1/f exponent BB -1.7 -1.7 -1.7 -1.7 -1.7 -3.0 -3.0 -3.0 -3.0
ell min 30 30 30 30 30 30 30 30 30
nside 512 512 512 512 512 512 512 512 512