An Estimation of the Effective Number of Electrons Contributing to the Coordinate Measurement with a TPC

Makoto Kobayashi

doi:10.1016/j.nima.2006.03.001

paper

An Estimation of the Effective Number of Electrons Contributing to the Coordinate Measurement with a TPC

arXiv:1903.03267 · doi:10.1016/j.nima.2006.03.001

Abstract

For time projection chambers (TPCs) the accuracy in measurement of track coordinates along the pad row direction deteriorates with the drift distance ( $z$ ): $σ_{X}^{2} \sim D_{X}^{2} \cdot z / N_{eff}$ , where $D_{X}$ is the diffusion constant and $N_{eff}$ is the effective number of electrons. Experimentally it has been shown that $N_{eff}$ is smaller than the average number of drift electrons per pad row ( $N$ ). We estimated $N_{eff}$ by means of a simple numerical simulation. The simulation shows that $N_{eff}$ can be as small as $\sim$ 30\% of $N$ due to the combined effect of statistical fluctuations in the number of drift electrons ( $N$ ) and in their multiplication in avalanches.

arXiv comment7 pages, including 6 figures

References in corpus (1)

Resolution studies of cosmic-ray tracks in a TPC with GEM readout

An Estimation of the Effective Number of Electrons Contributing to the Coordinate Measurement with a TPC

Abstract

References in corpus (1)

Cited by in corpus (11)