Tracker Interaction Geometry ESProducer in Fast Simulation

Complete: 5

Overview

From CMSSW_1_8_0_pre2 onwards, the Tracker Interaction Geometry has been made entirely configurable, and is produced with an ESProducer from the complete Reco Tracker geometry. This ESProducer can be invoked by adding in the configuration file (it is done automatically in FastSimulation/Configuration/data/CommonInputs.cff and CommonInputFakes.cff) the following lines

include "FastSimulation/Configuration/data/trackerGeometry.cfi"
include "FastSimulation/Configuration/data/TrackerRecoGeometryESProducer.cfi"
include "FastSimulation/TrackerSetup/data/TrackerInteractionGeometryESProducer.cfi"

The first two lines are needed to get the official tracker geometries (aligned and/or misaligned) and the official reco geometries (aligned and/or misaligned). The latter contains only the average position of the sensitive layers of the tracker, which the Tracker Interaction Geometry is built around. The last line points to the following file:

# With an ideal geometry (for the reconstruction)
es_module = TrackerInteractionGeometryESProducer {

    # Description of the tracker material
    include "FastSimulation/TrackerSetup/data/TrackerMaterial.cfi"

}

# The same as above but with a misaligned tracker geometry (for the simulation)
es_module misalignedTrackerInteractionGeometry = TrackerInteractionGeometryESProducer {

    untracked string trackerGeometryLabel = "MisAligned"
    string appendToDataLabel = "MisAligned"

    # Description of the tracker material
    include "FastSimulation/TrackerSetup/data/TrackerMaterial.cfi"
}
which constructs (on demand in the code) the Tracker Interaction Geometry either from the ideal tracker geometry (first part) or the misaligned geometry (second part), with the following lines of code
  // Initialize the misaligned tracker interaction geometry 
  edm::ESHandle<TrackerInteractionGeometry>  theTrackerInteractionGeometry;
  es.get<TrackerInteractionGeometryRecord>().get(misAligned, theTrackerInteractionGeometry );
where misAligned is a string set to "" or "MisAligned", for an ideal and a misaligned geometry, respectively.

Configuring

The Tracker Interaction Geometry is made of a list of infinitely thin nested cylinders aimed at reproducing the tracker material distribution as a function of r and z, assuming a complete phi symmetry. While the position (radius and length) of the sensitive layers are taken from the official geometries, their thickness and the characteristics of dead layers are configured in FastSimulation/TrackerSetup/data/TrackerMaterial.cfi, the content of which is included below (fasten your seat belt!):

# Material effects to be simulated in the tracker material and associated cuts
PSet TrackerMaterial = {

    // version 0 = Tracker geometry used between CMSSW_1_2_0 and CMSSW_1_4_10. Works for CSA07; 
    // version 1 = Tuned to CMSSW_1_7_0 geometry
    uint32 TrackerMaterialVersion = 1
    //**********************************************************************
    // Thickness of all (sensitive and dead) layers in x/X0
    //**********************************************************************
    // Beam Pipe
    vdouble BeamPipeThickness = { 0.0038, 0.00265 } # decrease of 30%
    // Pixel Barrel Layers 1-3
    vdouble PXBThickness = { 0.0222, 0.0217 } # ~ no change
    // Pixel Barrel services at the end of layers 1-3
    vdouble PXB1CablesThickness = { 0.100, 0.042 } # divide by 2
    vdouble PXB2CablesThickness = { 0.040, 0.042 } # ~ no change
    vdouble PXB3CablesThickness = { 0.030, 0.042 } # increase by 50%
    // Pixel Barrel outside cables
    vdouble PXBOutCables1Thickness = { 0.040, 0.040 } # no change
    vdouble PXBOutCables2Thickness = { 0.025, 0.015 } # divide by 2
    // Pixel Disks 1-2
    vdouble PXDThickness = { 0.044, 0.058 } # Increase by a third 
    // Pixel Endcap outside cables
    vdouble PXDOutCables1Thickness = { 0.023, 0.034 } # Increase by a third
    vdouble PXDOutCables2Thickness = { 0.085, 0.185 } # Increase by 110%
    // Tracker Inner barrel layers 1-4
    vdouble TIBLayer1Thickness = { 0.060, 0.053 } # decrease of 10% 
    vdouble TIBLayer2Thickness = { 0.047, 0.053 } # increase of 15%
    vdouble TIBLayer3Thickness = { 0.035, 0.035 } # no change 
    vdouble TIBLayer4Thickness = { 0.033, 0.040 } # increase of 20%
    // TIB outside services (endcap)
    vdouble TIBOutCables1Thickness = { 0.040, 0.108 } # Put everything in one layer 
    vdouble TIBOutCables2Thickness = { 0.040, 0.000 } 
    // Tracker Inner disks layers 1-3
    vdouble TIDLayer1Thickness = { 0.050, 0.040 } # decrease by 20%
    vdouble TIDLayer2Thickness = { 0.050, 0.040 } # decrease by 20%
    vdouble TIDLayer3Thickness = { 0.050, 0.055 } # increase by 10%
    // TID outside wall (endcap)
    vdouble TIDOutsideThickness = { 0.070, 0.074 } # increase of ~5%
    // TOB inside wall (barrel)
    vdouble TOBInsideThickness = { 0.017, 0.009 } # decrease by a factor 2
    // Tracker Outer barrel layers 1-6
    vdouble TOBLayer1Thickness = { 0.044, 0.030 } # decrease by 30%
    vdouble TOBLayer2Thickness = { 0.044, 0.030 } # decrease by 30%
    vdouble TOBLayer3Thickness = { 0.033, 0.022 } # decrease by 30%
    vdouble TOBLayer4Thickness = { 0.033, 0.022 } # decrease by 30% 
    vdouble TOBLayer5Thickness = { 0.033, 0.022 } # decrease by 30%
    vdouble TOBLayer6Thickness = { 0.033, 0.022 } # decrease by 30% 
    // TOB services (endcap)
    vdouble TOBOutsideThickness = { 0.090, 0.150 } # 80% increase
    // Tracker EndCap disks layers 1-9
    vdouble TECLayerThickness = { 0.041, 0.045 } # 10% increase 
    // TOB outside wall (barrel)
    vdouble BarrelCablesThickness = { 0.100, 0.038 } # A factor of three less
    // TEC outside wall (endcap)
    vdouble EndcapCables1Thickness = { 0.260, 0.210 } # 20% decrease
    vdouble EndcapCables2Thickness = { 0.080, 0.000 } # 70% increase 

    //**********************************************************************
    // Position of dead material layers (cables, services, etc.)
    //**********************************************************************
    // Beam pipe
    vdouble BeamPipeRadius = { 3.000, 3.000 } 
    vdouble BeamPipeLength = { 26.4, 28.3 } # Lengthen bt 1.9 cm 
    // Cables and Services at the end of PIXB1,2,3 ("disk")
    vdouble PXB1CablesInnerRadius = { 3.6, 3.7 } # shorten by 1 mm 
    vdouble PXB2CablesInnerRadius = { 6.1, 6.3 } # shorten by 2 mm
    vdouble PXB3CablesInnerRadius = { 8.5, 9.0 } # shorten by 5 mm
    // Pixel Barrel Outside walls and cables (endcap)
    vdouble PXBOutCables1InnerRadius = { 11.9, 11.9 } 
    vdouble PXBOutCables1OuterRadius = { 15.5, 15.5} 
    vdouble PXBOutCables1ZPosition = { 27.999, 28.799 } # Lengthen by 8 mm 
    vdouble PXBOutCables2InnerRadius = { 3.8, 3.8 }
    vdouble PXBOutCables2OuterRadius = { 16.5, 16.5 }
    vdouble PXBOutCables2ZPosition = { 28.0, 28.8 }  # Lengthen by 8 mm 
    // Pixel Outside walls and cables (barrel and endcap)
    vdouble PixelOutCablesRadius = { 17.1, 17.5 } # 4 mm outer
    vdouble PixelOutCablesLength = { 64.8, 72.0 } 
    vdouble PixelOutCablesInnerRadius = { 3.0, 3.0 } 
    vdouble PixelOutCablesOuterRadius = { 17.3, 17.61 }  # 3 mm outer
    vdouble PixelOutCablesZPosition = { 64.9, 72.1 } 
    // Tracker Inner Barrel Outside Cables and walls (endcap)
    vdouble TIBOutCables1InnerRadius = { 22.5, 22.5 } 
    vdouble TIBOutCables1OuterRadius = { 53.9, 53.9 } 
    vdouble TIBOutCables1ZPosition = { 75.001, 74.0 } 
    vdouble TIBOutCables2InnerRadius = { 35.5, 35.5 } 
    vdouble TIBOutCables2OuterRadius = { 53.901, 53.901 } 
    vdouble TIBOutCables2ZPosition = { 75.001, 74.001 } 
    // Tracker Inner Disks Outside Cables and walls (endcap)
    vdouble TIDOutCablesInnerRadius = { 32.0, 22.0 } # 10 cm more! 
    vdouble TIDOutCablesZPosition = { 108.0, 108.0 } 
    // Tracker outer barrel Inside wall (barrel)
    vdouble TOBInCablesRadius = { 54.5, 54.5 } 
    vdouble TOBInCablesLength = { 108.2, 108.2 } 
    // Tracker Outer Barrel Outside Cables and walls (barrel and endcap)
    vdouble TOBOutCablesInnerRadius = { 55.0, 55.0 } 
    vdouble TOBOutCablesOuterRadius = { 109.5, 111.0 } 
    vdouble TOBOutCablesZPosition = { 110.0, 115.0 } 
    vdouble TOBOutCablesRadius = { 119.5, 119.5 } 
    vdouble TOBOutCablesLength = { 299.9, 299.9 } 
    // Tracker Endcaps Outside Cables and walls (endcaps)
    vdouble TECOutCables1InnerRadius = { 6.0, 30.0 } # Not that low!
    vdouble TECOutCables1OuterRadius = { 120.001, 120.001 } 
    vdouble TECOutCables1ZPosition = { 300.0, 300.0 } 
    vdouble TECOutCables2InnerRadius = { 70.0, 68.0 } # 2cm longer 
    vdouble TECOutCables2OuterRadius = { 120.001, 120.001 } 
    vdouble TECOutCables2ZPosition = { 300.0, 300.0 } 

    //*********************************************************************
    // Fudge factor to reproduce the layer inhomgeneties
    // Tuned to 170 only.
    //*********************************************************************
    // Layer number (hard-coded in TrackerInteractionGeometry.cc)
    // Convention is < 100 for sensitive layer, > 100 for dead material
    // (although this convention is used nowhere...)
    vuint32 FudgeLayer = { 
   106,  # Pixel Barrel services 
   106,  # Pixel Barrel services 
   107,  # Pixel endcap services
   6,    # TIB1 services  
   7,    # TIB2 services  
   8,    # TIB3 services  
   9,    # TIB4 services  
   10,   # TID Layer 1
   11,   # TID Layer 2
   12,   # TID Layer 3
   110,  # TID outside services
   110,  # TID outside services
   111,  # TOB inside services
   111,  # TOB inside services
   13,   # TOB Layer1
   13,   # TOB Layer1
   13,   # TOB Layer1
   13,   # TOB Layer1
   14,   # TOB Layer2
   14,   # TOB Layer2
   14,   # TOB Layer2
   14,   # TOB Layer2
   15,   # TOB Layer3
   15,   # TOB Layer3
   15,   # TOB Layer3
   15,   # TOB Layer3
   16,   # TOB Layer4
   16,   # TOB Layer4
   16,   # TOB Layer4
   16,   # TOB Layer4
   17,   # TOB Layer5
   17,   # TOB Layer5
   17,   # TOB Layer5
   17,   # TOB Layer5
   18,   # TOB Layer6
   18,   # TOB Layer6
   18,   # TOB Layer6
   18,   # TOB Layer6
   112,  # TOB services
   112,  # TOB services
   112,  # TOB services
    19,  # TEC Layer 1
    19,  # TEC Layer 1
    19,  # TEC Layer 1
    20,  # TEC Layer 2
    20,  # TEC Layer 2
    20,  # TEC Layer 2
    21,  # TEC Layer 3
    21,  # TEC Layer 3
    21,  # TEC Layer 3
    22,  # TEC Layer 4
    22,  # TEC Layer 4
    22,  # TEC Layer 4
    23,  # TEC Layer 5
    23,  # TEC Layer 5
    23,  # TEC Layer 5
    24,  # TEC Layer 6
    24,  # TEC Layer 6
    24,  # TEC Layer 6
    25,  # TEC Layer 7
    25,  # TEC Layer 7
    26,  # TEC Layer 8
    26,  # TEC Layer 8
    27,  # TEC Layer 9
    27,  # TEC Layer 9
   113,  # Barrel Wall
   114,  # Endcap Wall
   114   # Endcap Wall
    } 
    // Lower limit on Radius or Z
    vdouble FudgeMin = {
    0.0,  # Pixel Barrel services 
   27.5,  # Pixel Barrel services 
    0.0,  # Pixel endcap services
   35.0,  # TIB1 services  
   35.0,  # TIB2 services  
   35.0,  # TIB3 services  
   35.0,  # TIB4 services  
   34.0,  # TID Layer 1
   34.0,  # TID Layer 2
   34.0,  # TID Layer 3
   47.5,  # TID outside services
   22.0,  # TID outside services
   27.5,  # TOB inside services
   72.0,  # TOB inside services
    0.0,  # TOB Layer 1
   18.0,  # TOB Layer 1
   36.0,  # TOB Layer 1
   55.0,  # TOB Layer 1
    0.0,  # TOB Layer 2
   18.0,  # TOB Layer 2
   36.0,  # TOB Layer 2
   55.0,  # TOB Layer 2
    0.0,  # TOB Layer 3
   18.0,  # TOB Layer 3
   36.0,  # TOB Layer 3
   55.0,  # TOB Layer 3
    0.0,  # TOB Layer 4
   18.0,  # TOB Layer 4
   36.0,  # TOB Layer 4
   55.0,  # TOB Layer 4
    0.0,  # TOB Layer 5
   18.0,  # TOB Layer 5
   36.0,  # TOB Layer 5
   55.0,  # TOB Layer 5
    0.0,  # TOB Layer 6
   18.0,  # TOB Layer 6
   36.0,  # TOB Layer 6
   55.0,  # TOB Layer 6
   55.0,  # TOB services
   62.0,  # TOB services
   78.0,  # TOB services
    0.0,  # TEC Layer 1
   24.0,  # TEC Layer 1
   34.0,  # TEC Layer 1
    0.0,  # TEC Layer 2
   24.0,  # TEC Layer 2
   34.0,  # TEC Layer 2
    0.0,  # TEC Layer 3
   24.0,  # TEC Layer 3
   34.0,  # TEC Layer 3
    0.0,  # TEC Layer 4
   32.0,  # TEC Layer 4
   41.0,  # TEC Layer 4
    0.0,  # TEC Layer 5
   32.0,  # TEC Layer 5
   41.0,  # TEC Layer 5
    0.0,  # TEC Layer 6
   32.0,  # TEC Layer 6
   41.0,  # TEC Layer 6
    0.0,  # TEC Layer 7
   32.0,  # TEC Layer 7
    0.0,  # TEC Layer 8
   32.0,  # TEC Layer 8
    0.0,  # TEC Layer 9
   32.0,  # TEC Layer 9
   120.0,  # Barrel wall
   33.0,  # Endcap wall
   68.0   # Endcap wall
    } 
    // Upper limit on Radius or Z
    vdouble FudgeMax = { 
    27.5,  # Pixel Barrel services 
    32.0,  # Pixel Barrel services 
    13.0,  # Pixel endcap services
    68.0,  # TIB1 services  
    68.0,  # TIB2 services  
    68.0,  # TIB3 services  
    68.0,  # TIB4 services  
    42.0,  # TID Layer 1
    42.0,  # TID Layer 2
    42.0,  # TID Layer 3
    54.0,  # TID outside services
    24.0,  # TID outside services
    30.5,  # TOB inside services
        110.0,  # TOB inside services
    18.0,  # TOB Layer 1
    30.0,  # TOB Layer 1
    46.0,  # TOB Layer 1
   108.0,  # TOB Layer 1
    18.0,  # TOB Layer 2
    30.0,  # TOB Layer 2
    46.0,  # TOB Layer 2
   108.0,  # TOB Layer 2
    18.0,  # TOB Layer 3
    30.0,  # TOB Layer 3
    46.0,  # TOB Layer 3
   108.0,  # TOB Layer 3
    18.0,  # TOB Layer 4
    30.0,  # TOB Layer 4
    46.0,  # TOB Layer 4
   108.0,  # TOB Layer 4
    18.0,  # TOB Layer 5
    30.0,  # TOB Layer 5
    46.0,  # TOB Layer 5
   108.0,  # TOB Layer 5
    18.0,  # TOB Layer 6
    30.0,  # TOB Layer 6
    46.0,  # TOB Layer 6
   108.0,  # TOB Layer 6
    60.0,  # TOB services
    78.0,  # TOB services
    92.0,  # TOB services
    24.0,  # TEC Layer 1
    34.0,  # TEC Layer 1
    39.0,  # TEC Layer 1
    24.0,  # TEC Layer 2
    34.0,  # TEC Layer 2
    39.0,  # TEC Layer 2
    24.0,  # TEC Layer 3
    34.0,  # TEC Layer 3
    39.0,  # TEC Layer 3
    32.0,  # TEC Layer 4
    40.0,  # TEC Layer 4
    46.0,  # TEC Layer 4
    32.0,  # TEC Layer 5
    40.0,  # TEC Layer 5
    46.0,  # TEC Layer 5
    32.0,  # TEC Layer 6
    40.0,  # TEC Layer 6
    46.0,  # TEC Layer 6
    32.0,  # TEC Layer 7
    60.0,  # TEC Layer 7
    32.0,  # TEC Layer 8
    60.0,  # TEC Layer 8
    32.0,  # TEC Layer 9
    60.0,  # TEC Layer 9
    301.0,  # Barrel wall
    35.0,  # Endcap wall
   120.0   # Endcap wall
    } 
    // Fudge factor on x/X0
    vdouble FudgeFactor = { 
   0.40,  # Pixel Barrel services 
   2.00,  # Pixel Barrel services 
   1.60,  # Pixel endcap services
   1.45,  # TIB1 services  
   1.45,  # TIB2 services  
   1.45,  # TIB3 services  
   1.45,  # TIB4 services  
   2.00,  # TID Layer 1
   2.00,  # TID Layer 2
   2.00,  # TID Layer 3
   2.50,  # TID outside services
   1.50,  # TID outside services
   4.00,  # TOB inside services
   5.50,  # TOB inside services
   0.70,  # TOB Layer 1
   2.00,  # TOB Layer 1
   2.00,  # TOB Layer 1
   2.00,  # TOB Layer 1
   0.70,  # TOB Layer 2
   2.00,  # TOB Layer 2
   2.00,  # TOB Layer 2
   2.00,  # TOB Layer 2
   0.70,  # TOB Layer 3
   2.00,  # TOB Layer 3
   2.00,  # TOB Layer 3
   2.00,  # TOB Layer 3
   0.70,  # TOB Layer 4
   2.00,  # TOB Layer 4
   2.00,  # TOB Layer 4
   2.00,  # TOB Layer 4
   0.70,  # TOB Layer 5
   2.00,  # TOB Layer 5
   2.00,  # TOB Layer 5
   2.00,  # TOB Layer 5
   0.70,  # TOB Layer 6
   2.00,  # TOB Layer 6
   2.00,  # TOB Layer 6
   2.00,  # TOB Layer 6
   0.50,  # TOB services
   1.50,  # TOB services
   1.80,  # TOB services
    2.2,  # TEC Layer 1
    0.8,  # TEC Layer 1
    1.6,  # TEC Layer 1
    2.2,  # TEC Layer 2
    0.8,  # TEC Layer 2
    1.6,  # TEC Layer 2
    2.2,  # TEC Layer 3
    0.8,  # TEC Layer 3
    1.6,  # TEC Layer 3
    2.5,  # TEC Layer 4
    0.6,  # TEC Layer 4
    1.4,  # TEC Layer 4
    2.5,  # TEC Layer 5
    0.6,  # TEC Layer 5
    1.4,  # TEC Layer 5
    2.5,  # TEC Layer 6
    0.6,  # TEC Layer 6
    1.4,  # TEC Layer 6
    3.0,  # TEC Layer 7
    0.6,  # TEC Layer 7
    3.0,  # TEC Layer 8
    0.6,  # TEC Layer 8
    3.0,  # TEC Layer 9
    0.6,  # TEC Layer 9
    3.8,  # Barrel wall
    3.0,  # Endcap wall
    1.6   # Endcap wall
    }
    
}

The TrackerMaterialVersion is to be set to 1 if one wants the material tuning adapted to the latest greatest knowledge, but one may want to simulate events with the same tracker material tuning as that used for the CAS07 production, in which case on would have to set it to 0. Note that the only Tracker Material Version available in CMSSW_1_6_8 (able to read CSA07 data) and in CMSSW_1_7_X (not recommended for Fast Simulation) corresponds to the geometry used in the CSA07 production.

Then, the thicknesses of all (sensitive and dead) layers follow, and are given in x/X0 (number of radiation lengths), for both Tracker Material Versions, followed by the positions of dead material layers (radii and lengths for barrel layers, inner/outer radii and z position for endcap layers). When such a position is not given (or incomplete), it just means that it is obtained from the position of the closest sensitive layer in the code itself.

Finally, it was observed that, in the full geometry, the tracker material is not distributed uniformly along r (for encap layers) or z (for barrel layers), and that, often, multiplicative fudge factors had to be applied to reproduce these inhomogeneities. The layer number, the range (rmin, rmax for endcap layers, zmin, zmax for barrel layers) and the multiplicative fudge factor (which applies to the thicnesses given above) are entered through the FudgeLayer, FudgeMin, FudgeMax and FudgeFactor vectors.

Tuning

The tuning of the tracker material is done with single electrons (positrons) of pT = 35 GeV/c, fully simulated in the sole tracker geometry, by counting the number of photons above 500 MeV emitted when traversing each tracker layer. The production of these electrons can be done with FastSimulation/MaterialEffects/test/batch.sh and FastSimulation/MaterialEffects/test/template.cfg, suitably modified according to your needs. (Don't run batch.sh blindly!)

The tuning can then be done with cmsRun FastSimulation/MaterialEffects/test/testMaterialEffects.cfg (again, don't run that blindly, you at least need to enter the full simulated electrons file names!), which runs the Fast Simulation on the generated information taken from the fully simulated event files, and compares the number of photons emitted at each layer in histograms, both for full and fast simulation. It creates a root file called test.root, which can be browsed with

root -l test.root
root> .x Brem.C
The latter script will draw for you the distribution of the number of photons emitted as a function of pseudo-rapidity, for the pixel layers, the inner tracker layers, the outer tracker layers and the outer cables and services, as shown in the following figure:

Tracker Material comparison in full and fast simulations:
AfterTuning.gif

Should you want to compare full and fast simulations for a given layer (e.g., first pixel barrel layer), or draw the radiography of the tracker in fast and full simulation, you would have to do

root> Comparison(PXB1Fast,PXB1Full)
Pixel Barrel layer 1 comparison in fast and full simulations:
PXB1.jpg
root> radioFast->Draw()
Radiography of the tracker in fast simulation:
radioFast.jpg
root> radioFull->Draw()
Radiography of the tracker in full simulation:
radioFull.jpg

More histograms can be drawn, the list of which can be inspected from the code in FastSimulation/MaterialEffects/test/testMaterialEffects.cc, or from a TBrowser in root. The names are usually self-explanatory, but detailed explanations can be found in the code.

Review Status

Editor/Reviewer and date Comments
PatrickJanot - 28 Nov 2007 First draft of the page

Responsible: AndreaGiammanco
Last reviewed by: most recent reviewer

Topic attachments
I Attachment History Action Size Date Who Comment
GIFgif AfterTuning.gif r1 manage 18.1 K 2007-11-28 - 17:13 PatrickJanot Tracker Material comparison in full and fast simulations
JPEGjpg PXB1.jpg r1 manage 23.5 K 2007-11-28 - 17:23 PatrickJanot Pixel Barrel Layer 1 comparison in fast and full simulation
JPEGjpg radioFast.jpg r1 manage 32.5 K 2007-11-28 - 17:21 PatrickJanot Radiography of the tracker in the fast simulation
JPEGjpg radioFull.jpg r1 manage 72.3 K 2007-11-28 - 17:21 PatrickJanot Radiography of the tracker in the full simulation
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Topic revision: r5 - 2011-12-14 - AndreaGiammanco



 
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