Download - TPC Simulators
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