Simulations for configurations with different frequency coverage
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.
500 simulations for each configuration with r=0 are available in the data_xx.yy 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 model a2f1d7s3 (model 03) and the first model based on MHD simulations (model 06) and are taken from the sky_yy folder at NERSC.
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.
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 |
