LHCb Simulation Tutorial

CERN, 21st-22nd February 2012

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Detector Simulation Examples

Creating a DB sliceFrom the LHCb twiki page :

SetupProject LHCb

setenv tagA head-20090914

setenv tagB sim-20111020-vc-md100

mkdir myDDDB-Tutorial-LHCb-Feb2012

dump_db_to_files.py -c sqlite_file:$SQLITEDBPATH/DDDB.db/DDDB -T $tagA

-d myDDDB-Tutorial-LHCb-Feb2012

dump_db_to_files.py -c sqlite_file:$SQLITEDBPATH/SIMCOND.db/SIMCOND

-T $tagB -d myDDDB-Tutorial-LHCb-Feb2012

For the tutorial

Copy the subdirectories

TutorialExample, LHCb, AfterMagnet

from /afs/cern.ch/user/s/seaso/public/Det/Tutorial/myDDDB-Tutorial-LHCb-Feb2012 area

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• The new geometry element is part of a DB slice . Let us call this local Db slice : ‘myDDDB-Tutorial-LHCb-Feb2012’

• Step1: Create a file ‘DetDb_Tutorial.py’ which has something like:

from Configurables import LHCbApp, CondDB, UpdateManagerSvc,DDDBConffrom Gaudi.Configuration import *

lhcbApp = LHCbApp()

DDDBConf().DbRoot = "/afs/cern.ch/user/s/seaso/scratch0/cmtuser/SQLDDDB/db/myDDDB-Tutorial-LHCb-Feb2012/lhcb.xml"CondDB().Tags['DDDB'] = 'HEAD'lhcbApp.DDDBtag = "head-20110914"lhcbApp.DataType = "2010"lhcbApp.Simulation = TrueLHCbApp().CondDBtag = "sim-20111020-vc-md100"

SetupProject Panoramix v20r2python $mypanoramix --BareConfig 1 –f none -v DetDb_Tutorial.py

• Step2:

Using Panoramix for Geometry Visualization

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• Step3: In the Panoramix window, click through the geometry tree

dd Structure Geometry AfterMagnetRegion TutorialMaster lvTutorialMaster

• Demonstration from an lxplus window.

Step 4: Use the info from HelpGeometry to navigate into the volumes

• Simple Solids, Boolean subtracted Solid.

• Array of solids

Using Panoramix for Geometry Visualization

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More info related to running Panoramix and copying the XmlVis in backup slides

Panoramix Demonstrations

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• Example Volumes : Three PixelContainers inside TutorialMaster Arrays of pixels inside each PixelContainer

Demonstration using Panoramics

More Examples

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(1) Create a boolean subtracted Box , starting from the Tutorial example and visualize it in Panoramix. It can be a box with two cylindrical holes. Example shown here.

Use the instructions in earlier slidesTo get the DB, before makingmodifications. The instructions forRunning panoramix are also in earlier slides.

An example solution is also provided in the database.

Exercises

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(2) In the example with Pixelcontainer, create pixels in a way which is symmetric around the beam axis. An example is shown here with pixels in the shape of r-phi geometry.

Exercises

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Exercise2: Part2After the Geant4 lecture

Use the volume create in Exercise 2 to run Gauss with particle gun and print

(a) The location of where the tracks are incident on the PixelContainer.

(b) The location of where the tracks are incident on the pixels.

Use the instructions from backup slides to run Gauss.

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BACKUP SLIDES

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For the Tutorial, a DB slice is made where the RICH2 is temporarily kept aside.

The space for that is used to create a TutorialMaster Volume within which we can create additional volumes in this tutorial. This can be copied to your area using instructions on page 2

Visualization attributes to volumes (colours , wire frames etc). The Tutorial Volume attributes in TutorialLogVols.xml, TutorialVisAtts.xml and colors.xml

setenvProject Panoramix v20r2cd ~/cmtuser/Panoramix_v20r2getpack Vis/XmlVis headOptional: getpack Vis/Panoramix v20r2 run $mypanamix from the options area of this panoramix.

DB Slice for Tutorial : Instructions for Panoramix

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• setenvGauss v41r1• cd ~/cmtuser/Gauss_v41r1• getpack Sim/Gauss v41r1 getpack Gen/LbPGuns getpack Tutorial/GaussTutorial head

• Compile the GaussTutorial• Edit Gauss requirements to use this packge• Copy the options files in /afs/cern.ch/user/s/seaso/public/Simulation/Tutorial/TutorialOptions

Use the standard Particle Gun options (alternately copy the options file ParticleGun_rich2.py from /afs/cern.ch/user/s/seaso/public/Simulation/Tutorial/Gen/LbPGubs/options area.)

gaudirun.py Gauss-DB-Feb2012-Tutorial.py Gauss_Job_TutorialUserPackage.py

Example running of Gauss

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1: In the ../myDDDB-Tutorial-LHCb-Feb-2012/TutorialExample

cp geometry_exercise1.xml geometry.xml cp structre_basic.xml structure.xml

SetupProject Panoramix v20r2python $mypanoramix --BareConfig 1 –f none -v DetDb_Tutorial.py

Exercise solutions

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2: In the ../myDDDB-Tutorial-LHCb-Feb2012/TutorialExample

cp geometry_exercise2.xml geometry.xml Then run panoramix as above To run gauss use the instructions on the previous slide

Tutorial DB optionsOptions for using volumes inside TutorialMaster

geometry_setA.xml : basic geometry

geometry_SetP.xml : few boolean solids

geometry_SetCoinA.xml : array of coins

geometry_SetPix.xml : PixelContainer

geometry_Exercise1.xml, geometry_Exercise2.xml, geometry_Exercise3.xml : solutions to the exercises

cp geometry_xxx.xml geometry.xml for the using the various setups

structure_basic.xml : basic geometry, boolean solids , PixelContainer etc.

With PixelContainer geometry:

structure_GenericDetElem.xml : generic detector element

structure_MasterSpDetElem.xml : customized detector element.

structure_exercise3.xml : solution to exercise 3

cp structure_xxx.xml structure.xml to use the various options.

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Tutorial Example XML

<DDDB><logvol name="lvTexPixContainer" material="RichMaterials/RichCO2" > <tubs name="TutorialPixContainer" sizeZ="TexSiContainerZSize" outerRadius="TexSiContainerOuterRadius" innerRadius="TexSiContainerInnerRadius" />

&TutorialPixArrayPhys; </logvol>

<!--<logvol name="lvTexSiPixel" material="Silicon" sensdet="TutorialSensDet/TexSensDet" >-->

<logvol name="lvTexSiPixel" material="Silicon" > <box name="TutorialPixBox" sizeX="TexSiPixXSize" sizeY="TexSiPixYSize" sizeZ="TexSiPixZSize" /></logvol>

</DDDB>

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Log Vol : Si Pix Array

Tutorial example XML

<DDDB>

<logvol name="lvTexCoin" material="TT/SiO2" >

<subtraction name="TutorialCoinSub" >

<tubs name="TutorialExampleCoinTubs"

sizeZ="TexCoinThickness"

outerRadius="TexCoinOuterR"

innerRadius="TexCoinInnerR" />

<box name="TutorialExampleCoinSubBox"

sizeX="TexCoinSubBoxXSize"

sizeY="TexCoinSubBoxYSize"

sizeZ="TexCoinSubBoxZLargeSize" />

<posXYZ />

</subtraction>

</logvol>

</DDDB>

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Log Vol : Coin shown in the slides