Difference: AlignmentStudies (1 vs. 3)

Revision 314 Dec 2009 - Main.BenHooberman

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META TOPICPARENT name="BenHoob"
-- BenHooberman - 09 Dec 2009
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<		 As discussed in http://venturia.home.cern.ch/venturia/GlobalRuns/PeakVsDeco/PeakVsDeco.html, there has been an observation of a difference in the alignment geometries obtained using CRAFT09 peak and deconvolution data. This is explained in a model by Andrea Venturi (Venturi model) which attributes the effect to a loss of charge from the sensor backplane, which takes the most time to traverse the detector and result in charge accumulation on the strips. This effect is greatest in deconvolution mode when the time window of charge integration is significantly shorter than in peak mode. The result is a bias in the position of the reconstructed hit in the detector module local u direction. When performing the alignment procedure, this bias translates to a shift in the extracted position of the detector in the local w direction (normal to the detector surface, pointing from the backplane to the strips). In TOB where the sensors are thickest and the effect is therefore maximized, an average deviation of 20 microns is observed between the aligned w positions of the detector modules between the peak and deconvolution alignment geometries.
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Revision 209 Dec 2009 - Main.BenHooberman

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META TOPICPARENT name="BenHoob"
-- BenHooberman - 09 Dec 2009
Deleted:
<
<		As discussed in http://venturia.home.cern.ch/venturia/GlobalRuns/PeakVsDeco/PeakVsDeco.html, there has been an observation of a bias in the alignment in CRAFT09 data between peak and deconvolution readout modes.
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Added:
>
>		As discussed in http://venturia.home.cern.ch/venturia/GlobalRuns/PeakVsDeco/PeakVsDeco.html, there has been an observation of a difference in the alignment geometries obtained using CRAFT09 peak and deconvolution data. This is explained in a model by Andrea Venturi (Venturi model) which attributes the effect to a loss of charge from the sensor backplane, which takes the most time to traverse the detector and result in charge accumulation on the strips. This effect is greatest in deconvolution mode when the time window of charge integration is significantly shorter than in peak mode. The result is a bias in the position of the reconstructed hit in the detector module local u direction. When performing the alignment procedure, this bias translates to a shift in the extracted position of the detector in the local w direction (normal to the detector surface, pointing from the backplane to the strips). In TOB where the sensors are thickest and the effect is therefore maximized, an average deviation of 20 microns is observed between the aligned w positions of the detector modules between the peak and deconvolution alignment geometries.
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Revision 109 Dec 2009 - Main.BenHooberman

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META TOPICPARENT name="BenHoob"
-- BenHooberman - 09 Dec 2009

As discussed in http://venturia.home.cern.ch/venturia/GlobalRuns/PeakVsDeco/PeakVsDeco.html, there has been an observation of a bias in the alignment in CRAFT09 data between peak and deconvolution readout modes.

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