Simulating the Charge Dispersion Phenomena in Micro Pattern Gas Detectors with a Resistive Anode

Details Simulating the Charge Dispersion Phenomena in Micro Pattern Gas Detectors with a Resistive Anode Simulating the Charge Dispersion Phenomena in Micro Pattern Gas Detectors with a Resistive Anode

2006-05-15

arxiv.org/abs/physics/0605121v1

Nucl.Instrum.Meth.A566:281-285,2006

Physics

Instrumentation and Detectors

9 pages, 5 figures, pdf file

Scientific paper

10.1016/j.nima.2006.06.050

The TPC for the International Linear Collider (ILC) will need to measure about 200 track points with a transverse resolution close to 100 microns. The resolution goal is beyond the capability of the conventional proportional wire/cathode pad TPC and Micro-Pattern Gas Detectors (MPGD) are being developed to meet the challenge. The standard MPGD readout techniques will, however, have difficulty in achieving the ILC-TPC resolution goal with the 2 mm x 6 mm pads as was initially envisioned. Proposals for smaller width pads will improve the resolution but will require a larger number of readout channels and increase the TPC detector cost and complexity. The new MPGD readout concept of charge dispersion has the potential to achieve the ILC-TPC resolution goal without resorting to narrower pads. This was recently demonstrated in cosmic ray tests of a small prototype TPC read out with MPGDs using the charge dispersion technique. Here we describe the simulation of the charge dispersion phenomena for the MPGD-TPC. The detailed simulation includes initial ionization clustering, electron drift, diffusion effects, the intrinsic detector pulse-shape and electronics effects. The simulation is in excellent agreement with the experimental data and can be used to optimize the MPGD charge dispersion readout for the TPC.

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