State Analysis

StTrs: State Diagrams

The overview summarizes these categories. The items below focus on a single category and outline the mode of operation of the detector that must be simulated.

Post-scipt viewable files are accessible below, however each box specified in the state-diagrams contain notes on methodology and ideas of how these effects must be incorporated into a full simulation. A summary of these are listed below. The associated (.mdl) file that generates these diagrams is located here. It must be opened within Rose.

• Overview isolates several categories that seem to have natural boundaries within the project. We assume that GEANT or a suitable fast generator will give us the coordinates of ionization produced along a track with momentum p will be given as input:
  
  • Ionization Transport is responsible for the transport of ionization through the drift volume of the TPC. This includes modelling the drift velocity, Electro-Magnetic fields as well as gas properties must be accounted for. The transmission through the wire grids and arrival in the amplification field is where the transport changes to charge collection.
  • Charge Collection is responsible for the charge collection of the electrons on the sense wires and the avalanche development. The motion of the positive ions created in the avalanche process will develop a signal that will be induced on the pad-plane. The capacitive coupling must be modeled. The result of these operations is an analog signal on each pad which is parameterized by the Pad Response Function.
  • Electronics Response takes the 1/T signal that is produced on the pads and simulates the electronics transfer function. This means the appropriate amplification and shaping is applied. Considerations for access to a calibration data base is also foreseen. The analog pulse is then digitized and a pulse height per pad is the output.