Difference between revisions of "HFI-Validation"

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{{DISPLAYTITLE:Internal overall validation}}
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{{DISPLAYTITLE:Overall internal validation}}
  
The HFI validation is mostly modular. That is, each part of the pipeline, be it timeline processing, map-making, or any other, validates the results of its work at each step of the processing, looking specifically for known issues. In addition, we do additional validation with an eye towards overall system integrity by looking at generic differences between sets of maps, in which most problems will become apparent, whether known or not. Both these are described below.  
+
The overall internal validation of the frequency maps is performed thanks to several tests:
 +
* difference between the PR2 (2015) and PR3 (2018) frequency maps,
 +
* survey difference maps for the PR2 and the PR3 frequency maps,
 +
* spectra of the PR2 and the PR3 data splits,
 +
* comparison of the FFP10 simulations and the PR3 data.  
  
==Expected systematics and tests (bottom-up approach)==
+
<br>
 +
<span style="font-size:150%">'''Frequency maps for the PR2 and the PR3 and their difference''' </span>
  
Like all experiments, Planck/HFI had a number of "issues" which it needed to track and verify were not compromising the data. While these are discussed in appropriate sections, here we gather them together to give brief summaries of the issues and refer the reader to the appropriate section for more details.  
+
This table shows the PR2 and PR3 maps and their differences in I, Q, and U. This table is complementary of the figure in {{PlanckPapers|planck2016-l03}} (see detailled explanations there).  
  
* Cosmic Rays - Unprotected by the atmosphere and more sensitive than previous bolometric experiments, HFI saw many more cosmic ray hits than previous experiments. These were detected, the worst parts of the data flagged as unusable, and "tails" were modeled and removed. This is described in [[TOI_processing#Glitch_statistics|the section on glitch statistics]]<!-- and in [[#Cosmic_rays|the section on cosmic rays]],--> as well as in {{PlanckPapers|planck2013-p03e|1|the 2013 HFI Cosmic Ray Removal paper}}.
+
{| border="1" cellpadding="3" cellspacing="0" align="center" style="text-align:centert" width=800px
* Elephants - Cosmic rays also hit the HFI 100 mK stage and cause the temperature to vary, inducing small temperature and thus noise variations in the detectors. These are removed with the rest of the thermal fluctuations, described directly below.  
+
|+ '''Comparaison of PR2 and PR3 I, Q and U maps and their difference. '''
* Thermal Fluctuations - HFI is an extremely stable instrument, but there are small thermal fluctuations. These are discussed in [[TOI_processing#Thermal_template_for_decorrelation|the timeline processing section on thermal decorrelation]]<!-- and in [[#1.6K_and_4K_stage_fluctuations|the section on 1.6 K and 4 K thermal fluctuations]]-->.
+
|- bgcolor="ffdead"
* Random Telegraphic Signal (RTS) or Popcorn Noise - Some channels were occasionally affected by what seems to be a baseline which abruptly changes between two levels, which has been variously called popcorn noise or random telegraphic signal. These data are usually flagged. This is described in [[TOI_processing#Noise_stationarity|the section on noise stationarity]]<!-- and [[#RTS_noise|the section on Random Telegraphic Signal Noise]]-->.
+
!
* Jumps - Similar to but distinct from popcorn noise, small jumps were occasionally found in the data streams. These data are usually corrected. This is described in [[TOI_processing#jump_correction|the section on jump corrections]].  
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!colspan="3"| PR2 frequency maps
* 4 K Cooler-Induced EM Noise - The 4 K cooler induced noise in the detectors with very specific frequency signatures, which is filtered. This is described in {{PlanckPapers|planck2013-p03|1|the 2013 HFI DPC Paper}}<!--, [[#4K_lines_Residuals|the section below on 4 K line residuals]]-->, and their stability is discussed in [[TOI_processing#4K_cooler_lines_variability|the section on 4 K cooler line stability]].
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!colspan="3"| PR3 frequency maps
* Compression - On-board compression is used to overcome our telemetry bandwidth limitations. This is explained in {{PlanckPapers|planck2011-1-5}}.  
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!colspan="3"| difference
* Noise Correlations - Correlations in noise between detectors seems to be negligible but for two polarization sensitive detectors in the same horn. This is discussed in {{PlanckPapers|planck2013-p03e|1|the 2013 HFI Cosmic Ray Removal paper}}.
+
|-
* Pointing - The final pointing reconstruction for Planck is near the arcsecond level. This is discussed in {{PlanckPapers|planck2013-p03|1|the 2013 HFI DPC Paper}}.
+
!
* Focal Plane Geometry - The relative positions of different horns in the focal plane is reconstructed using planets. This is also discussed in {{PlanckPapers|planck2013-p03|1|the 2013 HFI DPC paper}}.  
+
!I
* Main Beam - The main beams for HFI are discussed in the {{PlanckPapers|planck2013-p03d|1|2013 Beams and Transfer function paper}}.  
+
!Q
* Ruze Envelope - Random imperfections or dust on the mirrors can increase the size of the beam a bit. This is discussed in {{PlanckPapers|planck2013-p03d|1|the 2013 Beams and Transfer function paper}}.
+
!U
* Dimpling - The mirror support structure causes a pattern of small imperfections in the beams, which cause small sidelobe responses outside the main beam. This is discussed in {{PlanckPapers|planck2013-p03d|1|the 2013 Beams and Transfer function paper}}.
+
!I
* Far Sidelobes - Small amounts of light can sometimes hit the detectors from just above the primary or secondary mirrors, or even from reflecting off the baffles. While small, when the Galactic center is in the right position, this can be detected in the highest frequency channels, so this is removed from the data. This is discussed in {{PlanckPapers|planck2013-p03d|1|the 2013 Beams and Transfer function paper}} and, non-intuitively, {{PlanckPapers|planck2013-pip88|1|the 2013 Zodiacal emission paper}}.  
+
!Q
* Planet Fluxes - Comparing the known fluxes of planets with the calibration on the CMB dipole is a useful check of calibration for the CMB channels, and is the primary calibration source for the submillimeter channels. This is done in {{PlanckPapers|planck2013-p03b|1|the 2013 Map-Making and Calibration Paper}}.  
+
!U
* Point Source Fluxes - As with planet fluxes, we also compare fluxes of known, bright point sources with the CMB dipole calibration. This is done in {{PlanckPapers|planck2013-p03b|1|the 2013 Map-Making and Calibration paper}}.  
+
!I
* Time Constants - The HFI bolometers do not react instantaneously to light; there are small time constants, discussed in {{PlanckPapers|planck2013-p03d|1|the 2013 Beams and Transfer function paper}}.  
+
!Q
* ADC Correction - The HFI Analog-to-Digital Converters are not perfect, and are not used perfectly. While this is an on-going effort, their effects on the calibration are discussed in {{PlanckPapers|planck2013-p03c|1|the 2013 Map-Making and Calibration paper}}.
+
!U
<!--* Gain changes with Temperature Changes-->
+
|-
<!--* Optical Cross-Talk - This is negligible, as noted in [[#Optical_Cross-Talk|the optical cross-talk note]]. -->
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| 100 GHz
* Bandpass - The transmission curves, or "bandpass" has shown up in a number of places. This is discussed in {{PlanckPapers|planck2013-p03d|1|the 2013 spectral response paper}}.  
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|[[File:100GHz_DX11_I.pdf.pdf|100px]]
<!--* Saturation - While this is mostly an issue only for Jupiter observations, it should be remembered that the HFI detectors cannot observe arbitrarily bright objects. This is discussed in [[#Saturation|the section below on saturation]].-->
+
|[[File:100GHz_DX11_Q.pdf.pdf|100px]]
 +
|[[File:100GHz_DX11_U.pdf.pdf|100px]]
 +
|[[File:100GHz_I.pdf|100px]]
 +
|[[File:100GHz_Q.pdf|100px]]
 +
|[[File:100GHz_U.pdf|100px]]
 +
|[[File:100GHz_diff_I.pdf.pdf|100px]]
 +
|[[File:100GHz_diff_Q.pdf.pdf|100px]]
 +
|[[File:100GHz_diff_U.pdf.pdf|100px]]
 +
|-
 +
| 143 GHz
 +
|[[File:143GHz_DX11_I.pdf.pdf|100px]]
 +
|[[File:143GHz_DX11_Q.pdf.pdf|100px]]
 +
|[[File:143GHz_DX11_U.pdf.pdf|100px]]
 +
|[[File:143GHz_I.pdf|100px]]
 +
|[[File:143GHz_Q.pdf|100px]]
 +
|[[File:143GHz_U.pdf|100px]]
 +
|[[File:143GHz_diff_I.pdf.pdf|100px]]
 +
|[[File:143GHz_diff_Q.pdf.pdf|100px]]
 +
|[[File:143GHz_diff_U.pdf.pdf|100px]]
 +
|-
 +
| 217 GHz
 +
|[[File:217GHz_DX11_I.pdf.pdf|100px]]
 +
|[[File:217GHz_DX11_Q.pdf.pdf|100px]]
 +
|[[File:217GHz_DX11_U.pdf.pdf|100px]]
 +
|[[File:217GHz_I.pdf|100px]]
 +
|[[File:217GHz_Q.pdf|100px]]
 +
|[[File:217GHz_U.pdf|100px]]
 +
|[[File:217GHz_diff_I.pdf.pdf|100px]]
 +
|[[File:217GHz_diff_Q.pdf.pdf|100px]]
 +
|[[File:217GHz_diff_U.pdf.pdf|100px]]
 +
|-
 +
| 353 GHz
 +
|[[File:353GHz_DX11_I.pdf.pdf|100px]]
 +
|[[File:353GHz_DX11_Q.pdf.pdf|100px]]
 +
|[[File:353GHz_DX11_U.pdf.pdf|100px]]
 +
|[[File:353GHz_I.pdf|100px]]
 +
|[[File:353GHz_Q.pdf|100px]]
 +
|[[File:353GHz_U.pdf|100px]]
 +
|[[File:353GHz_diff_I.pdf.pdf|100px]]
 +
|[[File:353GHz_diff_Q.pdf.pdf|100px]]
 +
|[[File:353GHz_diff_U.pdf.pdf|100px]]
 +
|-
 +
| 545 GHz
 +
|[[File:545GHz_DX11_I.pdf.pdf|100px]]
 +
| .
 +
| .
 +
|[[File:545GHz_I.pdf|100px]]
 +
| .
 +
| .
 +
|[[File:545GHz_diff_I.pdf.pdf|100px]]
 +
| .
 +
| .
 +
|-
 +
| 857 GHz
 +
|[[File:857GHz_DX11_I.pdf.pdf|100px]]
 +
| .
 +
| .
 +
|[[File:857GHz_I.pdf|100px]]
 +
| .
 +
| .
 +
|[[File:857GHz_diff_I.pdf.pdf|100px]]
 +
| .
 +
| .
 +
|}
  
<!---==Generic approach to systematics==
 
  
<font style="color:red;font-size:300%">This section is Under (Re-)Construction</font>
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<br>
 +
<span style="font-size:150%">'''Survey difference maps for the PR2 and the PR3 data''' </span>
  
Some (null) tests done at the map level are described in the HFI map making paper (REf).
+
This table shows the PR2 and PR3 survey difference maps ((S1+S3)-(S2+S4))in I, Q, and U. This table is taken from {{PlanckPapers|planck2016-l03}} (see detailled explanations there).
 +
 
 +
{| border="1" cellpadding="3" cellspacing="0" align="center" style="text-align:centert" width=800px
 +
|+ '''Comparaison of PR2 and PR3 I, Q and U survey difference maps.'''
 +
|- bgcolor="ffdead"
 +
!
 +
!colspan="3"| PR2 survey difference maps
 +
!colspan="3"| PR3 survey difference maps
 +
|-
 +
!
 +
!I
 +
!Q
 +
!U
 +
!I
 +
!Q
 +
!U
 +
|-
 +
| 100 GHz
 +
|[[File:100GHz_DX11_surveyS1S3_S2S4_I.pdf|100px]]
 +
|[[File:100GHz_DX11_surveyS1S3_S2S4_Q.pdf.pdf|100px]]
 +
|[[File:100GHz_DX11_surveyS1S3_S2S4_U.pdf.pdf|100px]]
 +
|[[File:100GHz_RD12RC4_surveyS1S3_S2S4_I.pdf|100px]]
 +
|[[File:100GHz_RD12RC4_surveyS1S3_S2S4_Q.pdf|100px]]
 +
|[[File:100GHz_RD12RC4_surveyS1S3_S2S4_U.pdf|100px]]
 +
|-
 +
| 143 GHz
 +
|[[File:143GHz_DX11_surveyS1S3_S2S4_I.pdf|100px]]
 +
|[[File:143GHz_DX11_surveyS1S3_S2S4_Q.pdf.pdf|100px]]
 +
|[[File:143GHz_DX11_surveyS1S3_S2S4_U.pdf.pdf|100px]]
 +
|[[File:143GHz_RD12RC4_surveyS1S3_S2S4_I.pdf|100px]]
 +
|[[File:143GHz_RD12RC4_surveyS1S3_S2S4_Q.pdf|100px]]
 +
|[[File:143GHz_RD12RC4_surveyS1S3_S2S4_U.pdf|100px]]
 +
|-
 +
| 217 GHz
 +
|[[File:217GHz_DX11_surveyS1S3_S2S4_I.pdf|100px]]
 +
|[[File:217GHz_DX11_surveyS1S3_S2S4_Q.pdf.pdf|100px]]
 +
|[[File:217GHz_DX11_surveyS1S3_S2S4_U.pdf.pdf|100px]]
 +
|[[File:217GHz_RD12RC4_surveyS1S3_S2S4_I.pdf|100px]]
 +
|[[File:217GHz_RD12RC4_surveyS1S3_S2S4_Q.pdf|100px]]
 +
|[[File:217GHz_RD12RC4_surveyS1S3_S2S4_U.pdf|100px]]
 +
|-
 +
| 353 GHz
 +
|[[File:353GHz_DX11_surveyS1S3_S2S4_I.pdf|100px]]
 +
|[[File:353GHz_DX11_surveyS1S3_S2S4_Q.pdf.pdf|100px]]
 +
|[[File:353GHz_DX11_surveyS1S3_S2S4_U.pdf.pdf|100px]]
 +
|[[File:353GHz_RD12RC4_surveyS1S3_S2S4_I.pdf|100px]]
 +
|[[File:353GHz_RD12RC4_surveyS1S3_S2S4_Q.pdf|100px]]
 +
|[[File:353GHz_RD12RC4_surveyS1S3_S2S4_U.pdf|100px]]
 +
|-
 +
| 545 GHz
 +
|[[File:545GHz_DX11_surveyS1S3_S2S4_I.pdf|100px]]
 +
| .
 +
| .
 +
|[[File:545GHz_RD12RC4_surveyS1S3_S2S4_I.pdf|100px]]
 +
| .
 +
| .
 +
|-
 +
| 857 GHz
 +
|[[File:857GHz_DX11_surveyS1S3_S2S4_I.pdf|100px]]
 +
| .
 +
| .
 +
|[[File:857GHz_RD12RC4_surveyS1S3_S2S4_I.pdf|100px]]
 +
| .
 +
| .
 +
|}
 +
 
 +
 
 +
<br>
 +
<span style="font-size:150%">'''Spectra of the PR2 and the PR3 data splits''' </span>
 +
 
 +
This figure shows the ''EE'' and ''BB'' spectra of the PR2 and PR3 detset, half-mission and rings (for PR3 only) maps at 100, 143, 217, and 353 GHz. The auto-spectra of the difference maps and the cross-spectra between the maps are shown. The sky fraction used here is 43 %. The bins are: bin=1 for <math>2\leq\ell<30</math>; bin=5 for <math>30\leq\ell<50</math>; bin=10 for <math>50\leq\ell<160</math>; bin=20 for <math>160\leq\ell<1000</math>; and bin=100 for <math>\ell>1000</math>. This figure is taken from {{PlanckPapers|planck2016-l03}} (see detailled explanations there).
 +
 
 +
<center>
 +
[[File:cl_fsky43_DX11_RD12RC4_3000_oddeven_multiplot.pdf|500px]]
 +
</center>
 +
 
 +
 
 +
<br>
 +
<span style="font-size:150%">'''Comparison of the FFP10 simulated noise and systematic residuals and the PR3 data''' </span>
 +
 
 +
This figure shows the noise and systematic residuals in ''TT'', ''EE'', ''BB'', and ''EB'' spectra, at the three CMB frequencies, for difference maps of the ring (red) and half-mission (blue) null tests binned by <math>\Delta \ell =10</math>. Data spectra are represented by thick lines, and the averages of simulations by thin black lines. For the simulations, we show the 16 % and 84 % quantiles of the distribution with the same colours. This figure is taken from {{PlanckPapers|planck2016-l03}} (see detailled explanations there).
 +
 
 +
<center>
 +
[[File:newpte.pdf|500px]]
 +
</center>
  
Some further tests will be described in the "CMB power spectra and liklihood paper".
 
  
Finally detailed End-to-end simulations (from lowest level instrument behaviour to maps) are still ongoing for a detailed characterisation, which will accompany the 100-217GHz polarisation maps when they will be made available, probably before the summer 2015.--->
 
  
 
==References==
 
==References==

Latest revision as of 08:40, 3 July 2018


The overall internal validation of the frequency maps is performed thanks to several tests:

  • difference between the PR2 (2015) and PR3 (2018) frequency maps,
  • survey difference maps for the PR2 and the PR3 frequency maps,
  • spectra of the PR2 and the PR3 data splits,
  • comparison of the FFP10 simulations and the PR3 data.


Frequency maps for the PR2 and the PR3 and their difference

This table shows the PR2 and PR3 maps and their differences in I, Q, and U. This table is complementary of the figure in Planck-2020-A3[1] (see detailled explanations there).

Comparaison of PR2 and PR3 I, Q and U maps and their difference.
PR2 frequency maps PR3 frequency maps difference
I Q U I Q U I Q U
100 GHz 100GHz DX11 I.pdf.pdf 100GHz DX11 Q.pdf.pdf 100GHz DX11 U.pdf.pdf 100GHz I.pdf 100GHz Q.pdf 100GHz U.pdf 100GHz diff I.pdf.pdf 100GHz diff Q.pdf.pdf 100GHz diff U.pdf.pdf
143 GHz 143GHz DX11 I.pdf.pdf 143GHz DX11 Q.pdf.pdf 143GHz DX11 U.pdf.pdf 143GHz I.pdf 143GHz Q.pdf 143GHz U.pdf 143GHz diff I.pdf.pdf 143GHz diff Q.pdf.pdf 143GHz diff U.pdf.pdf
217 GHz 217GHz DX11 I.pdf.pdf 217GHz DX11 Q.pdf.pdf 217GHz DX11 U.pdf.pdf 217GHz I.pdf 217GHz Q.pdf 217GHz U.pdf 217GHz diff I.pdf.pdf 217GHz diff Q.pdf.pdf 217GHz diff U.pdf.pdf
353 GHz 353GHz DX11 I.pdf.pdf 353GHz DX11 Q.pdf.pdf 353GHz DX11 U.pdf.pdf 353GHz I.pdf 353GHz Q.pdf 353GHz U.pdf 353GHz diff I.pdf.pdf 353GHz diff Q.pdf.pdf 353GHz diff U.pdf.pdf
545 GHz 545GHz DX11 I.pdf.pdf . . 545GHz I.pdf . . 545GHz diff I.pdf.pdf . .
857 GHz 857GHz DX11 I.pdf.pdf . . 857GHz I.pdf . . 857GHz diff I.pdf.pdf . .



Survey difference maps for the PR2 and the PR3 data

This table shows the PR2 and PR3 survey difference maps ((S1+S3)-(S2+S4))in I, Q, and U. This table is taken from Planck-2020-A3[1] (see detailled explanations there).

Comparaison of PR2 and PR3 I, Q and U survey difference maps.
PR2 survey difference maps PR3 survey difference maps
I Q U I Q U
100 GHz 100GHz DX11 surveyS1S3 S2S4 I.pdf 100GHz DX11 surveyS1S3 S2S4 Q.pdf.pdf 100GHz DX11 surveyS1S3 S2S4 U.pdf.pdf 100GHz RD12RC4 surveyS1S3 S2S4 I.pdf 100GHz RD12RC4 surveyS1S3 S2S4 Q.pdf 100GHz RD12RC4 surveyS1S3 S2S4 U.pdf
143 GHz 143GHz DX11 surveyS1S3 S2S4 I.pdf 143GHz DX11 surveyS1S3 S2S4 Q.pdf.pdf 143GHz DX11 surveyS1S3 S2S4 U.pdf.pdf 143GHz RD12RC4 surveyS1S3 S2S4 I.pdf 143GHz RD12RC4 surveyS1S3 S2S4 Q.pdf 143GHz RD12RC4 surveyS1S3 S2S4 U.pdf
217 GHz 217GHz DX11 surveyS1S3 S2S4 I.pdf 217GHz DX11 surveyS1S3 S2S4 Q.pdf.pdf 217GHz DX11 surveyS1S3 S2S4 U.pdf.pdf 217GHz RD12RC4 surveyS1S3 S2S4 I.pdf 217GHz RD12RC4 surveyS1S3 S2S4 Q.pdf 217GHz RD12RC4 surveyS1S3 S2S4 U.pdf
353 GHz 353GHz DX11 surveyS1S3 S2S4 I.pdf 353GHz DX11 surveyS1S3 S2S4 Q.pdf.pdf 353GHz DX11 surveyS1S3 S2S4 U.pdf.pdf 353GHz RD12RC4 surveyS1S3 S2S4 I.pdf 353GHz RD12RC4 surveyS1S3 S2S4 Q.pdf 353GHz RD12RC4 surveyS1S3 S2S4 U.pdf
545 GHz 545GHz DX11 surveyS1S3 S2S4 I.pdf . . 545GHz RD12RC4 surveyS1S3 S2S4 I.pdf . .
857 GHz 857GHz DX11 surveyS1S3 S2S4 I.pdf . . 857GHz RD12RC4 surveyS1S3 S2S4 I.pdf . .



Spectra of the PR2 and the PR3 data splits

This figure shows the EE and BB spectra of the PR2 and PR3 detset, half-mission and rings (for PR3 only) maps at 100, 143, 217, and 353 GHz. The auto-spectra of the difference maps and the cross-spectra between the maps are shown. The sky fraction used here is 43 %. The bins are: bin=1 for [math]2\leq\ell\lt 30[/math]; bin=5 for [math]30\leq\ell\lt 50[/math]; bin=10 for [math]50\leq\ell\lt 160[/math]; bin=20 for [math]160\leq\ell\lt 1000[/math]; and bin=100 for [math]\ell\gt 1000[/math]. This figure is taken from Planck-2020-A3[1] (see detailled explanations there).

Cl fsky43 DX11 RD12RC4 3000 oddeven multiplot.pdf



Comparison of the FFP10 simulated noise and systematic residuals and the PR3 data

This figure shows the noise and systematic residuals in TT, EE, BB, and EB spectra, at the three CMB frequencies, for difference maps of the ring (red) and half-mission (blue) null tests binned by [math]\Delta \ell =10[/math]. Data spectra are represented by thick lines, and the averages of simulations by thin black lines. For the simulations, we show the 16 % and 84 % quantiles of the distribution with the same colours. This figure is taken from Planck-2020-A3[1] (see detailled explanations there).

Newpte.pdf


References[edit]

Cosmic Microwave background