Nonlinear Phenomena in Complex Systems, 2023, Vol.26, No.4, pp.393

NONLINEAR PHENOMENA IN COMPLEX SYSTEMS
An Interdisciplinary Journal

2023, Vol.26, No.4, pp.393 - 400

Optimization of Electrical Conductivity of the Anodic DLC Coating of Charged Particle Detector

I. A. Zur, A. S. Fedotov, A. A. Kharchanka, Y. E. Shmanay, J. A. Fedotova, and S. A. Movchan

We consider a mathematical model that predicts the electric conductivity of anodic resistive coatings in a charged particle detector and ensures the removal of electron charge in a time shorter than the electron avalanche period. The model is based on the equations for non-stationary electrical current in solids and implemented in COMSOL Multiphysics finite-element code. The model allowed us to establish a correlation between the duration of the avalanche time τ, the amplitude of the current pulse j_max, and the electrical conductivity σ. The model predicted that for a thick gas elecrton multiplier detector with a standard gain about 10⁴ order and a thickness of coating 100 nm, the conductivity σ should be in the range (2...5)·10⁻⁷ S/m in order to ensure that current does not exceed the breakdown value that lies in the range ~1.5 μA. This allowed us to define the most appropriate regime of charged particle detector functioning that combines a high rate of operation and resistance to coating erosion in a detector. The obtained results will be useful for the improvement of the time resolution of charged particles detection in well-type detectors.

Key words: nanoscale resistive coatings, DLC, charged particle detectors, numerical optimization algorithms, specific electrical conductivity of coatings

DOI: https://doi.org/10.5281/zenodo.10410196

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