Difference: ApprovedPlotsTRT (26 vs. 27)

Revision 272009-12-02 - AndreaBocci3

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META TOPICPARENT name="ApprovedDetectorPlots"
No permission to view Atlas.AtlasPublicTopic
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deltaQoPtTRT.png
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Q/Pt resolution improvement of TRT only tracks due to TRT internal alignment
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Impact of TRT Barrel Module Alignment (L2) on strawlayer residual
  This plots is made with TRT-only tracks (from CTB), with the following requirements:
- minimum pT>2GeV
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 - Reject tracks that come from events with more than one reco CTB track (< 5 % of events, avoids pattern reco mistakes )
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The tracks are for five golden runs with magnetic field from Fall 2008 (runs 91885, 91888, 91890, 91891, 91900).
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The tracks are for one of the golden runs with magnetic field from Fall 2008 (runs 91900) and the plot show the residuals the strawlayers belonging to Phi Stack number 19.

Note that we do not align each strawlayer separately, but only the modules (3 modules in the case of one stack). This is why the residuals after the alignment don't go to zero. The plot also shows why we do this. The misalignment of the strawlayers (red point) are not random, but there is a structure corresponding to misalignment of modules as a whole. In addition this plot shows that the precision of the barrel assembly (that can be inferred by the magnitude of the strawlayer residual before the alignment) is within 50um, better than the expected 100um usually quoted.

  Contact: Andrea Bocci
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deltaQoPtTRT.png
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.ResVsStraw.png
 
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META FILEATTACHMENT attachment="deltaQoPtTRT.png" attr="" comment="Impact of L2 on TRT Q/pt resolution" date="1259148228" name="deltaQoPtTRT.png" path="deltaQoPtTRT.png" size="24834" stream="deltaQoPtTRT.png" tmpFilename="/usr/tmp/CGItemp41744" user="abocci" version="1"
META FILEATTACHMENT attachment="TRTResL2.eps" attr="" comment="Impact of L2 on TRT Residual Resolution" date="1259148330" name="TRTResL2.eps" path="TRTResL2.eps" size="52453" stream="TRTResL2.eps" tmpFilename="/usr/tmp/CGItemp45108" user="abocci" version="1"
META FILEATTACHMENT attachment="TRTResL2.png" attr="" comment="Impact of L2 on TRT Residual Resolution" date="1259148352" name="TRTResL2.png" path="TRTResL2.png" size="25270" stream="TRTResL2.png" tmpFilename="/usr/tmp/CGItemp45157" user="abocci" version="1"
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META FILEATTACHMENT attachment="ResVsStraw.png" attr="" comment="" date="1259776490" name="ResVsStraw.png" path="ResVsStraw.png" size="20183" stream="ResVsStraw.png" tmpFilename="/usr/tmp/CGItemp56979" user="abocci" version="1"
META FILEATTACHMENT attachment="ResVsStraw.eps" attr="" comment="Strawlayer misalignment" date="1259776545" name="ResVsStraw.eps" path="ResVsStraw.eps" size="16821" stream="ResVsStraw.eps" tmpFilename="/usr/tmp/CGItemp56968" user="abocci" version="1"
 
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