r19 - 14 Oct 2009 - 09:35:29 - CarlosEscobarYou are here: TWiki >  Atlas Web  >  SiliconForwardTracker > SiAlignment > AlignmentCSCMultimuons

CSC Multimuons Alignment

Data

Multimuons

  • Files on CASTOR:
    /castor/cern.ch/user/a/atlidali/data/csc/multimuons
  • Files on the MPI file server:
    blphmpi00:/net/fsphmpi01/mnt/data/id_align/data/csc/multimuons

CSC preAlignment results

Track Parameters

  • Reconstructed Q/Pt for the multimuons sample. The Q/Pt vs phi0 distribution can be used to detect some of the detector deformations. In particular it can show us evidence of sagitta and clocking effect (see figures for fun). As one can see in the scatter plot (iPatRec png, GlobalX2Fitter png) of the Q/Pt versus Phi0, one can distinguish a sine waweform that corresponds to a sagitta effect. It is also possible to distinguish an assymetry between the momentum reconstructed for positive and negative particles as the black bands are not equally distributed around zero. This assymetry is due to a clocking effect. Positive charged particles are reconstructed systematically with lower momentum, whilst negative charged particles are reconstructed systematically with a higher momentum.

  • Perigee and Beam Spot: CSC multimuons have been generated at (0,0,0) whith some spread, while the detector (PIX and SCT) has been shifted. All these conditions have an impact on the impact parameter and perigee of the reconstructed tracks. In the reconstruction the perigee is computed w.r.t. the origin (0,0,0) instead of w.r.t. the primary vertex.
    • Ideal case (perfect alignment though modules not at nominal position): png
    • Nominal case (ignoting the misalignment, placing modules at nominal positions): png
      • d0 cartesian view: png
      • z0 cartesian view: png
      • cartesian view: png
      • polar coordinates view: png

Results with the TrkValidation/InDetAlignNt ntuples

Results with the TrkValidation ntuple with ID tracks and with SiOnly tracks. Futhermore, track parameters and residuals comparation has been done using the InDetAlignNt ntuple (Unbiased residuals):

ID Tracks Vs SiOnly Tracks Plots
Setup Detectors # events Tracker Summary plots
Nominal Pixel+SCT+TRT 10k KalmanFitter ps pdf
Nominal Pixel+SCT 10k KalmanFitter ps pdf
Comparison plots (from the InDetAlignNt): Trk Params: png, Pixel/SCT bias res: png

Results comparing the differences between the use of the ErrorScaling in each case:

ErrorScaling Plots
Setup # events Tracker ErrorScaling Summary plots
Nominal 50k iPatRec No ps pdf
Nominal 25k iPatRec Yes ps pdf
L1L2L3 Corrected 25k iPatRec No ps pdf
L1L2L3 Corrected 25k iPatRec Yes* ps pdf
L1L2L3 Corrected 50k GlobalChi2Fitter Yes* ps pdf

Results with the GlobalChi2AlignAlg ntuple

Results with our ntuple (biased residuals and SiOnly tracks). Here, the DoubleCone geometry (2328 barrel modules - 13968 DoFs) is used:

GlobalChi2AlignAlg ntuple
Setup # events # tracks # hits Tracker ErrorScaling starting IDAlignVis LocalPos GlobalPos Summary plots
Nominal 25k 233779 2179873 iPatRec Yes* - - - ps pdf
L1 Corrected 25k 232516 2356026 iPatRec Yes (txt) (txt) (txt) ps pdf
L2 Corrected 25k 237241 2381481 iPatRec Yes (txt) (txt) (txt) ps pdf
L1L2 Corrected 25k 241449 2262378 iPatRec No (txt) (txt) (txt) ps pdf
L3 Corrected 25k 234609 2186907 iPatRec Yes (txt) (txt) (png) (png) (txt) ps pdf
L1L2L3 Corrected 25k 235266 2721301 iPatRec No - - - ps pdf

rel12 Vs rel13

Comparation between results with rel 12.0.4 and rel 13.0.10. In this case we have used Si-Only tracks. The DoubleCone geometry has been use to produce the plots labeled with processed in the title.

rel12 Vs rel13
release Setup # events # tracks # hits # processed tracks # processed hits Tracker ErrorScaling VtxFit Summary plots
12.0.4 L1L2L3 Corrected 25k 235266 2721301 100895 1107087 iPatRec No Yes ps pdf
12.0.6 L1L2L3 Corrected 25k 235266 2721301 100895 1107087 iPatRec No Yes ps pdf
13.0.10 L1L2L3 Corrected 25k 234204 2698346 99469 1091847 iPatRec No Yes ps pdf
13.0.10* L1L2L3 Corrected 25k 234194 2697968 99469 1091847 iPatRec No Yes ps pdf
12.0.4 Nominal 25k 233779 2179873 99622 940220 iPatRec Yes Yes ps pdf
12.0.6 Nominal 25k 233779 2179869 99622 940220 iPatRec Yes Yes ps pdf
13.0.10 Nominal 25k - - - - iPatRec Yes Yes ps pdf
13.0.10 Nominal 25k 213739 1325465 10559 88515 iPatRec Yes** Yes ps pdf

(*) Using the iPatRec bugfixes from Alan Poppleton
(**) Error Scaling tunned by Wolfgang for rel 12.0.4

ID tracks, SCTOnly tracks and PixelOnly tracks

Studies done using the RefitSiOnlyTool to refit tracks in rel13:

RefitSiOnlyTool
Setup Tracks # events # tracks # hits Tracker ErrorScaling VtxFit Summary plots
L1L2L3 Corrected Pixel-Only 5k - - GlobalChi2Fitter No Yes ps pdf
L1L2L3 Corrected SCT-Only 5k - - GlobalChi2Fitter No Yes ps pdf

GlobalChi2 Alignment

Alignment Results using SiOnly tracks and the DoubleCone geometry (2328 barrel modules - 13968 DoFs). Plots from our ntuple (biased residuals):

Perfect Geometry (Misalignment Known)

Perfect Geometry - L1L2L3 Corrected (18.02.2007) - Release 12.0.4
Iteration # events # tracks # hits Tracker ErrorScaling VtxFit LocalPos GlobalPos Summary plots Alignment Constants
0 99150 399937 4387874 iPatRec No Yes (txt) (txt) ps pdf (pool.root) (db) (txt)
1 99150 399938 4388049 iPatRec No Yes (txt) (txt) ps pdf (pool.root) (db) (txt)
2 25000 100897 1107125 iPatRec No Yes (txt) (txt) ps pdf -
0 99150 400496 4402638 GX2Fitter No Yes (txt) (txt) ps pdf (pool.root) (txt)
1 25000 101035 1110782 GX2Fitter No Yes (txt) (txt) ps pdf -
Comparison plots of Iterations 0, 1 and 2 for iPatRec
Only for tracks laying within the DoubleCone acceptance region
- Number of PIX and SCT hits associated per track: png
- Reconstructed track parameters: png
- Impact parameted error and d0 vs phi0: png
- Q/p plots in various formats for systematic studies: png
- Pixel phi residuals: png
- Pixel eta residuals: png
- SCT residuals: png

Perfect Geometry - L1L2L3 Corrected (17.09.2007) - Release 13.0.20
Iteration # events # tracks # hits Tracker ErrorScaling VtxFit LocalPos GlobalPos Summary plots Alignment Constants
0 50k - - GX2F No Yes (txt) (txt) ps pdf (-)

Nominal Geometry (Misalignment Unknown)

Misalignment Unknown - Nominal Case - Release 12.0.4 (07.04.2007)
Iteration # events # tracks # hits Tracker ErrorScaling VtxFit LocalPos GlobalPos Summary plots Alignment Constants
0 99150 394995 3728284 iPatRec - - - - ps pdf -
1 99150 398967 4316909 iPatRec - - - - ps pdf -
2 99150 399110 4373332 iPatRec - - - - ps pdf -
3 10000 40296 441927 iPatRec - - - - ps pdf -
Comparison plots of Iterations 0, 1, 2 for iPatRec
Only for tracks laying within the DoubleCone acceptance region. The ideal case is also included and serves as reference
So far, in all iterations, error scaling has been applied
- Track parameters: png

In the reconstructed Pt, one may observe that the Q+Q- assymmetry decreases slihgtly after each iterarion. It does not clear, but the trend is a monotonical drecrease. Whilst in the equivalent plots extracted using newTracking (GlobalX2Fitter) it steadily grows.

Misalignment Unknown - Nominal Case - Release 12.0.4 (21 Feb 2007)
Iteration # events # tracks # hits Tracker ErrorScaling VtxFit LocalPos GlobalPos Summary plots Alignment Constants
0 99150 341604 2952281 GlobalChi2Fitter Yes - - - ps pdf -
1 99150 385028 3910740 GlobalChi2Fitter Yes - - - ps pdf -
2 99150 394033 4339267 GlobalChi2Fitter Yes - - - ps pdf -
3 99100 394606 4353202 GlobalChi2Fitter Yes - - - ps pdf -
4 10000 4043 44451 GlobalChi2Fitter Yes - - - ps pdf -
Comparison plots of Iterations 0, 1, 2, 3 and 4 for GlobalChi2Fitter
Only for tracks laying within the DoubleCone acceptance region. The ideal case is also included and serves as reference
- Track parameters: jpg (More tracks are reconstructed after each iter)
- Track params: Reco-Truth: jpg
- Hits associated to tracks: jpg More hits are associated to the tracks. SCT is back to 8 and PIX to 3.
- Pixel phi biased residuals: jpg All residuals become more centered/narrower after each iter
- Pixel eta biased residuals: jpg
- SCT biased residuals: jpg
- SCT biased residuals (wider range): jpg
- Tranverse plane Impact parameter (d0) error and its phi0 dependence: jpg
- Accepted tracks per events (so tracks within double cone acceptance): jpg
- Q/p plots in various formats for systematic studies: jpg

L3 Misalignment Unknown (L1L2 Corrected)

L3 Misalignment Unknown - L1L2 Corrected - Release 12.0.4
Iteration # events # tracks # hits Tracker ErrorScaling VtxFit LocalPos GlobalPos Summary plots Alignment Constants
0 - - - - - - - - - (pool.root) (txt)
1 99150 331970 3033087 iPatRec No Yes - - ps pdf -
1 99150 396769 4184346 GlobalChi2Fitter Yes Yes (txt) (txt) ps pdf (pool.root) (db) (txt)
2 99150 399842 4396654 GlobalChi2Fitter Yes Yes (txt) (txt) ps pdf (pool.root) (db) (txt)
3 99150 39743 4388241 GlobalChi2Fitter No Yes (txt) (txt) ps pdf (pool.root) (db) (txt)
4 25000 100855 1109255 GlobalChi2Fitter No Yes (txt) (txt) ps pdf -

-- CarlosEscobar - 19 Apr 2007

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txttxt Iter0_Perfect_GX2F_IDAlignVisualization.txt manage 420.8 K 04 Jul 2007 - 11:54 CarlosEscobar Iter0_Perfect_GX2F_IDAlignVisualization.txt
elsegz Perfect_25k_NoES_DC_iPat_VtxFit_rel13_fix.ps.gz manage 1838.8 K 04 Jul 2007 - 15:45 CarlosEscobar Perfect_25k_NoES_DC_iPat_VtxFit_rel13_fix.ps.gz
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