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Full simulation study of the T2K TPC

Full simulation study of the T2K TPC. Dean Karlen, U. Victoria & TRIUMF ILC TPC Analysis Jamboree February 14, 2006. Simulation programs. Neutrino interactions are simulated by Neut, using the expected n spectrum at the off-axis detector

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Full simulation study of the T2K TPC

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  1. Full simulation study of the T2K TPC Dean Karlen, U. Victoria & TRIUMF ILC TPC Analysis Jamboree February 14, 2006

  2. Simulation programs • Neutrino interactions are simulated by Neut, using the expected n spectrum at the off-axis detector • GEANT3 propagates the particles through a gas volume in a 0.2 T magnetic field • energy loss in the gas is recorded in 1 mm steps • jtpc program reads the energy loss info: • generates electrons in the TPC gas and transports electrons to endplate • simulates gas amplification • assigns electrons to pads, producing signals • pre-amplifies, shapes, digitizes, writes to files Momentum resolution in the T2K TPC with full simulations

  3. Simulation parameters TPC parameters electronics parameters Ar CO2 (90:10) typical digitized signal Momentum resolution in the T2K TPC with full simulations

  4. Simulation geometry E, B 60 cm n 120 cm 60 cm interactions occur at edge of TPC Momentum resolution in the T2K TPC with full simulations

  5. Reconstruction program • jtpc package used analyze MC files: • reads digitized information • reconstructs charge deposited on pads • finds track (or uses MC cheat to “find track”) • performs a track fit, by maximizing the likelihood of the observed pattern of charge sharing within the rows  to beam direction • writes ntuple files – with truth and reconstructed information n Momentum resolution in the T2K TPC with full simulations

  6. Examples of delta ray events • delta rays are included in simulations • no special treatment in track fit Momentum resolution in the T2K TPC with full simulations

  7. Summary • won’t bother showing results… • The jtpc package includes a scheme for full simulation of TPC signals • Resolutions from simulation and prototype data are very close • to see results, please refer to:NIMA 555 (2005) 80, physics/0509051 Momentum resolution in the T2K TPC with full simulations

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