Influence of the cathode surface conditions on dark current emission

Authors

  • Maykel Márquez Mijares Instituto Superior de Tecnologías y Ciencias Aplicadas (InSTEC). Universidad de La Habana. Academia de Ciencias de Cuba, https://orcid.org/0000-0003-2503-2802
  • Bruno Lepetit Laboratoire Collisions Agrégats Réactivité, UMR5589, Université de Toulouse, https://orcid.org/0000-0001-9099-6742
  • Didier Lemoine Laboratoire Collisions Agrégats Réactivité, UMR5589, Université de Toulouse, CNRS, Bât. 3R1b4 - 118 route de Narbonne, 31062 Toulouse Cedex 09

Keywords:

plasma heater, dark current, electronic field emission

Abstract

Introduction. Inside the high vacuum chambers of the plasma heater of the future nuclear fusion reactors, such as ITER or DEMO, so-called “dark currents” are produced which, with time, cause damages to different components. Although this typical emission has an explanation on the basis of field emission theory, there are still many questions to be described. The objective was to use a model based on Density Functional Theory to describe some aspects of the field emission due to contaminated surfaces or nanometric irregularities. Methods. Studies were conducted on tungsten and tungsten carbide surfaces contaminated with carbon, as well as on clean tungsten corrugated surfaces. Results. Knowledge of the origin of “dark currents” was advanced, as well as its relation with different irregularities on the cathode surfaces.

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Published

2022-01-01

How to Cite

Márquez Mijares, M., Lepetit, B., & Lemoine, D. (2022). Influence of the cathode surface conditions on dark current emission. Anales De La Academia De Ciencias De Cuba, 12(1), e1123. Retrieved from https://revistaccuba.sld.cu/index.php/revacc/article/view/1123

Issue

Vol. 12 No. 1 (2022): enero-abril

Section

Natural and Exact Sciences

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