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TPC Simulators

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

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TPC Simulators

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  1. TPC Simulators • Simulate response of TPC Detector volume • Relevant processes • Ionization Drift • Amplification in Sense Wires • Pad Plane Signal Generation • Readout Electronics ALICE-STAR Joint Meeting Manuel Calderón de la Barca Sánchez Rem. Sl. 8

  2. Current Simulators • Fast Simulator : TFS • Fortran based • Extensively exercised • Fast, but not very detailed • Slow Simulator : TRS • C++ based • More detailed breakdown of interesting processes ALICE-STAR Joint Meeting Manuel Calderón de la Barca Sánchez Rem. Sl. 7

  3. Geant Hit  Signal 2 Widths: prf & z Intrinsic Pad Response Drift Length Pad Crossing Angle Sense Wire Spacing Diffusion, Trans. & Lon. Electronics Shaping Time & Sampling Frequency Geant HitPositions Gaussian Smear = f(prf) Hit Merging = f(prf , z) TFS Output  Tracking VERY Fast slide on TFS ALICE-STAR Joint Meeting Manuel Calderón de la Barca Sánchez Rem. Sl. 6

  4. TRS: Factorization & OO • Is it possible to factorize the processes occurring in the chamber? • Study each process individually • Each process a different base class • Algorithms for a particular process are implemented in derived classes ALICE-STAR Joint Meeting Manuel Calderón de la Barca Sánchez Rem. Sl. 5

  5. TRS : Processes • Charge Transport • Charge Collection • Analog Signal Generation • Electronics Response & Digitization ALICE-STAR Joint Meeting Manuel Calderón de la Barca Sánchez Rem. Sl. 4

  6. Charge Transport • Transport charge (sub-)segments to sense wires. with field cage electrostatics ... • Field Cage Structure • E & B Field Maps • Wire Grid Transparency • … and Gas properties • Drift velocity • Diffusion & Absorption ALICE-STAR Joint Meeting Manuel Calderón de la Barca Sánchez Rem. Sl. 3

  7. Induced Charge on Pad Gas Gain Amplification Gas Gain Saturation Cross coupling between adjacent rows Noise generation Implementations, e.g. induced charge: “Slow” Image charge integral at the single electron level’ “Parameterized” Pad response function Analog Signal ALICE-STAR Joint Meeting Manuel Calderón de la Barca Sánchez Rem. Sl. 2

  8. Amplification & Gain Analog shaping response & time Gaussian, Asymmetric Gaussian, convolution of shaper response funct. w/ longitudinally diffused cluster. Sampling of signal Distribution of charge into time bins Digitization Analog to Digital Conversion Zero Suppression Electronics Response ALICE-STAR Joint Meeting Manuel Calderón de la Barca Sánchez Rem. Sl. 1

  9. Status & Summary • Algorithms being tested, debugged & refined (comparison w/ cosmic ray data) • Separation of Parameters & Algorithms • DB  Geometry, Gas, Calibration parameters • Coordinate Transformations • Placed DB Utilities area for general use • Speed up Algorithms (~20 min/Central Hijing) ALICE-STAR Joint Meeting Manuel Calderón de la Barca Sánchez Rem. Sl. 0

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