tpc simulators
DESCRIPTION
TPC Simulators. Simulate response of TPC Detector volume Relevant processes Ionization Drift Amplification in Sense Wires Pad Plane Signal Generation Readout Electronics. Rem. Sl. 8. Current Simulators. Fast Simulator : TFS Fortran based Extensively exercised - PowerPoint PPT PresentationTRANSCRIPT
TPC Detector Simulators
TPC Fast Simulator &TPC Response Simulator
April 9, 2000 ALICE-STAR Joint MeetingALICE-STAR Joint Meeting
April 9, 2000 ALICE-STAR Joint MeetingALICE-STAR Joint MeetingManuel Calderón de la Barca Sánchez
TPC Simulators
Simulate response of TPC Detector volume
Relevant processesIonization DriftAmplification in Sense WiresPad Plane Signal GenerationReadout Electronics
Rem. Sl. 8
April 9, 2000 ALICE-STAR Joint MeetingALICE-STAR Joint MeetingManuel Calderón de la Barca Sánchez
Current Simulators
Fast Simulator : TFSFortran basedExtensively exercisedFast, but not very detailed
Slow Simulator : TRSC++ basedMore detailed breakdown of
interesting processesRem. Sl. 7
April 9, 2000 ALICE-STAR Joint MeetingALICE-STAR Joint MeetingManuel Calderón de la Barca Sánchez
VERY Fast slide on TFS
Geant Hit Signal2 Widths: prf & z
Intrinsic Pad Response Drift Length Pad Crossing Angle Sense Wire Spacing Diffusion, Trans. & Lon. Electronics Shaping
Time & Sampling Frequency
Geant HitPositions Gaussian Smear = f(prf ) Hit Merging = f(prf , z )
TFS Output Tracking
Rem. Sl. 6
April 9, 2000 ALICE-STAR Joint MeetingALICE-STAR Joint MeetingManuel Calderón de la Barca Sánchez
TRS: Factorization & OO
Is it possible to factorize the processes occurring in the chamber?
Study each process individuallyEach process a different base classAlgorithms for a particular process are
implemented in derived classes
Rem. Sl. 5
April 9, 2000 ALICE-STAR Joint MeetingALICE-STAR Joint MeetingManuel Calderón de la Barca Sánchez
TRS : Processes
Charge TransportCharge CollectionAnalog Signal GenerationElectronics Response & Digitization
Rem. Sl. 4
April 9, 2000 ALICE-STAR Joint MeetingALICE-STAR Joint MeetingManuel Calderón de la Barca Sánchez
Charge Transport
Transport charge (sub-)segments to sense wires. with field cage electrostatics ...Field Cage StructureE & B Field MapsWire Grid Transparency
… and Gas propertiesDrift velocityDiffusion & Absorption
Rem. Sl. 3
April 9, 2000 ALICE-STAR Joint MeetingALICE-STAR Joint MeetingManuel Calderón de la Barca Sánchez
Analog Signal
Induced Charge on PadGas Gain
AmplificationGas Gain SaturationCross coupling
between adjacent rows
Noise generation
Implementations, e.g. induced charge:“Slow”
Image charge integral at the single electron level’
“Parameterized” Pad response
function
Rem. Sl. 2
April 9, 2000 ALICE-STAR Joint MeetingALICE-STAR Joint MeetingManuel Calderón de la Barca Sánchez
Electronics Response
Amplification & GainAnalog shaping
response & time Gaussian, Asymmetric
Gaussian, convolution of shaper response funct. w/ longitudinally diffused cluster.
Sampling of signalDistribution of
charge into time bins
DigitizationAnalog to Digital
ConversionZero Suppression
Rem. Sl. 1
April 9, 2000 ALICE-STAR Joint MeetingALICE-STAR Joint MeetingManuel Calderón de la Barca Sánchez
Status & Summary
Algorithms being tested, debugged & refined (comparison w/ cosmic ray data)
Separation of Parameters & AlgorithmsDB Geometry, Gas, Calibration parametersCoordinate Transformations
Placed DB Utilities area for general use
Speed up Algorithms (~20 min/Central Hijing)
Rem. Sl. 0