Simulation of Three Dimensional Electrostatic Field Configuration in Wire Chambers : A Novel Approach

Details Simulation of Three Dimensional Electrostatic Field Configuration in Wire Chambers : A Novel Approach Simulation of Three Dimensional Electrostatic Field Configuration in Wire Chambers : A Novel Approach

2006-04-05

arxiv.org/abs/physics/0604030v2

Nucl.Instrum.Meth.A566:489-494,2006

Physics

Instrumentation and Detectors

Revised version submitted to Elsevier Science including some more near-field calculations

Scientific paper

10.1016/j.nima.2006.06.035

Three dimensional field configuration has been simulated for a simple wire chamber consisting of one anode wire stretched along the axis of a grounded square cathode tube by solving numerically the boundary integral equation of the first kind. A closed form expression of potential due to charge distributed over flat rectangular surface has been invoked in the solver using Green's function formalism leading to a nearly exact computation of electrostatic field. The solver has been employed to study the effect of several geometrical attributes such as the aspect ratio ($\lambda = \frac{l}{d}$, defined as the ratio of the length $l$ of the tube to its width $d$) and the wire modeling on the field configuration. Detailed calculation has revealed that the field values deviate from the analytic estimates significantly when the $\lambda$ is reduced to 2 or below. The solver has demonstrated the effect of wire modeling on the accuracy of the estimated near-field values in the amplification region. The thin wire results can be reproduced by the polygon model incorporating a modest number of surfaces ($\geq 32$) in the calculation with an accuracy of more than 99%. The smoothness in the three dimensional field calculation in comparison to fluctuations produced by other methods has been observed.

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