Difference: HifiCalibrationWeb (59 vs. 60)

Revision 602013-11-19 - DavidTeyssier

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META TOPICPARENT name="WebHome"

HIFI instrument and calibration web pages

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NEW NEW NEW Latest updates -- 23 October 2013 NEW NEW NEW
  • HIPE 11.0 has been released !
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NEW NEW NEW Latest updates -- 19 November 2013 NEW NEW NEW
  • HIPE 11.1 has been released !
 
  • HIPI 2.1 (a library of Hifi Plug-In's) has been released - see Interest Groups and Scripts section
  • New matching technique script is available in the Expert Version of HIPE - see the "Outstanding calibration issues" section
  • A large amount of calibration data has been released ! - see the "Observing with HIFI" section
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Reducing HIFI data

Recommended User release

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Which data would most benefit from being reprocessed in HIPE 11.0?

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Which data would most benefit from being reprocessed in HIPE 11.1?

  If your data have been processed with the latest bulk reprocessing (10.3):
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  • DBS Observations
    • A new pipeline step, mkDbsReference, calculates the differences the chop positions in all DBS observations and after applying the band-pass correction stores them in a product in calibration->pipeline-out called ReferenceSpectra. This allows you to check for contamination in chop positions for all types of DBS observations.
 
  • Rotated maps
    • Rotated cubes are now produced in the Level 2.5 product by default for maps carried out with a non-zero position angle, a non-rotated cube is also produced.

  • Solar System Object ephemerides
    • A bug (see here) was fixed in the calculation of SSO ephemeris positions (ra_centre/dec_centre) that led to offsets of up to ~10". This bug affected users that use cubes in a co-moving frame (including the standard level 2.5 cubes), use the doOffset task, or make explicit use of ra_centre / dec_centre in their HIPE scripts. The offset is practically constant over a map and could, e.g., make the emission of a comet appear to be off-center when it really isn't. The fixed bug is in the level 0 pipeline, which users cannot run easily. The issue will be fixed by the HIPE 11 bulk reprocessing. In the meantime, you can use a HIPE snippet such as the one attached here.
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  • Improved pointing reconstruction for observations taken before OD 320
  If your data have been processed with a version earlier than 10.3:
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  • DBS Observations If you have data processed with < HIPE 10
    • A new pipeline step, mkDbsReference, calculates the differences the chop positions in all DBS observations and after applying the band-pass correction stores them in a product in calibration->pipeline-out called ReferenceSpectra. This allows you to check for contamination in chop positions for all types of DBS observations.
 
  • Improved pointing reconstruction for observations taken between OD 320 and 761 If you have data processed with < HIPE 9
    • The pointing information attached to the data for observations taken between OD 320 and OD761 did not use the most accurate representation of the star tracker focal length. This will be done for the bulk reprocessing with HIPE 9. As a consequence, some observations will experience a shift in astrometry, that can be as high as 8 arcsec. All the details about the consequences for a particular obsid, and recipes to reconstruct yourself the improved pointing can be found at http://herschel.esac.esa.int/twiki/bin/view/Public/HowToUseImprovedPointingProducts as well as in the level0 section of the Hifi Data Reduction Guide
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    • Un-balanced side-band gains will apply for some ranges of these bands (see also the calibration section). Reprocessing data from band 2a is recommended if your data are still processed with HIPE 6. Reprocessing data from band 5a and 5b is recommended if your data are processed with HIPE 8.

  • Spectral Scan Data in bands 6 and 7 If you have data processed with < HIPE 8
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    • It is recommended to reprocess spectral scan data taken in band 6 and 7 if they are still processed with HIPE <8. This is not needed in data processed with HIPE 8.
    • Reprocessing with HIPE 9 will create a new level 2.5 product containing a deconvolved single-side-band spectrum for each applicable spectrometer
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    • It is recommended to reprocess spectral scan data taken in band 6 and 7 if they are still processed with HIPE <8. This is not needed in data processed with HIPE 8 onward.
    • Reprocessing with HIPE 9 onward will create a new level 2.5 product containing a deconvolved single-side-band spectrum for each applicable spectrometer
 
  • Maps If you have data processed with < HIPE 8
    • Spectral cubes from mapping observations after OD 835 gridded using actual scan line and readout used in observation, earlier maps use a better approximation than in HIPE 7. These improvements are a consequence of changes in the level 0 pipeline to read in information about how the observation was performed and require the pipeline to be re-run after running the doUplink step:
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  • See the What's New page for more details of improvements in HIPE 11.0
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  • See the What's New page for more details of improvements in HIPE 11.1
 

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Documentation and Cookbooks

  • The HIFI Launch Pad is intended to help you quickly off the ground with HIFI data reduction
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    • Note that differences may be seen in H and V profiles, see the note on H and V positions. If you are particularly interested in the spatial structure of your source you may prefer not to average the H and V polarisations together.
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Documentation

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  • This FTP repository of system temperature plots across the IF for each HIFI subband (updated 24 Jan 2011) inform about the variation in system temperature (sensitivity) across the HIFI intermediate frequency band at various frequencies
 
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  • Side band ratio
    • Side band ratio technical note: This note describes the general calibration problem associated with the side-band gain imbalance existing in double-side-band heterodyne systems such as HIFI, and provides some recipes and calibration tables applicable to the particular case of the HIFI mixers.
 
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  • Side band ratio
    • Side band ratio technical note: This note describes the general calibration problem associated with the side-band gain imbalance existing in double-side-band heterodyne systems such as HIFI, and provides some recipes and calibration tables applicable to the particular case of the HIFI mixers.
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  • This FTP repository of system temperature plots across the IF for each HIFI subband (updated 24 Jan 2011) inform about the variation in system temperature (sensitivity) across the HIFI intermediate frequency band at various frequencies
 

Calibration error budget

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      • Matching technique: for the strong IF standing waves seen in bands 6 and 7.
        • A script is available in the source directory of the 'expert' install of HIPE: scripts/hifi/scripts/users/engineering/HEBStWvCatalogCorrection.py It is extensively commented. Alternatively, the latest version can be found here
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        • At the HIPE Forum 2012, a demo of a pre-release version of the script provided in HIPE 11.0 was given. The presentation, that version of the script, a prepared input catalog for use by the script, and some result plots can be found on the twiki page:
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        • At the HIPE Forum 2012, a demo of a pre-release version of the script provided in HIPE 11.1 was given. The presentation, that version of the script, a prepared input catalog for use by the script, and some result plots can be found on the twiki page:
 
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-- DavidTeyssier , CarolynMcCoey and SylvieFBeaulieu - 23 October 2013
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-- DavidTeyssier , CarolynMcCoey and SylvieFBeaulieu - 19 November 2013
 
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