Nanoclusters and nanoscale voids as possible sources of increasing dark current in high-gradient vacuum breakdown

The potential barrier model considering an additional current that can lead to the high-gradient breakdowns in accelerating structures is proposed. An oscillatory resonance feature of the field emission current from a double-layer metal system with a nanoscale coating is shown. The double potential...

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Bibliographic Details
Published in:The European physical journal. D, Atomic, molecular, and optical physics Atomic, molecular, and optical physics, 2022-04, Vol.76 (4), Article 68
Main Authors: Musiienko, I. I., Lebedynskyi, S. O., Kholodov, R. I.
Format: Article
Language:English
Subjects:
Applications of Nonlinear Dynamics and Chaos Theory
Atomic
Breakdown
Current density
Dark current
Electric field strength
Field emission
High Field QED Physics
Molecular
Nanoclusters
Optical and Plasma Physics
Physical Chemistry
Physics
Physics and Astronomy
Potential barriers
Quantum Information Technology
Quantum Physics
Regular Article – Atomic Physics
Spectroscopy/Spectrometry
Spintronics
Surface layers
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Summary:The potential barrier model considering an additional current that can lead to the high-gradient breakdowns in accelerating structures is proposed. An oscillatory resonance feature of the field emission current from a double-layer metal system with a nanoscale coating is shown. The double potential barrier was used for calculations of the field emission current density value. The presence of resonant properties of the field emission current density of a double-layer metal system with a nanometric coating is revealed. The field emission current increasing more than 5 times (for the constant value of an electric field strength E = 5 G V / m ) when considering not ideal copper surface with the presence of nanoclusters on the surface of or nanoscale voids in the near-surface layer is observed. Graphical abstract
ISSN:1434-6060
1434-6079
DOI:10.1140/epjd/s10053-022-00394-7