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TPC Simulators
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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