9th International Workshop on Mechanisms of Vacuum Arcs (MeVArc 2021)

Session

Field emission

10 Mar 2021, 14:00

Online

Conveners

Field emission: Theory

• Andreas Kyritsakis

Field emission: Experiments

• Anton Saressalo (Helsinki Institute of Physics (FI))

5. General scaling laws of space charge effects in field emission

Mihkel Veske

10/03/2021, 14:00

Oral

The characteristics of field electron and ion emission change when the space charge formed by the emitted charge is sufficient to suppress the extracting electric field. This phenomenon is well described for planar emitting diodes by the one dimensional (1D) theory. Here we generalize for any 3D geometry by deriving the scaling laws describing the field suppression in the weak space
charge...

9. Quantum regime of field emission based on exchange-correlation effects in a nanogap

Nan Li (Xi‘an Jiatong University)

10/03/2021, 14:30

Oral

Considering quantum effects of field emission in a nanogap, we explore the impact of space charge on the field emission current density by using one dimension quantum model which includes exchange-correlation effects and space-charge effects. It is found that the quantum effect is significant within a certain range of applied voltage and gap. Therefore, the quantum regime, high current regime,...

33. Theoretical study of field emission from dielectric coated surfaces

Peng Zhang (Michigan State University)

10/03/2021, 15:00

Oral

Electron field emission plays an essential role in a wide range of applications, such as, electron microscopes, X-ray sources, high power microwave sources and amplifiers, vacuum micro-electronics, and emerging nano-electronics [1-5]. Ultra-thin coatings are fabricated onto metallic cathodes to provide chemical and mechanical protection, and longer current stability, smaller turn-on electric...

37. ANALYZING EXPERIMENTAL DATA ON INGINITION OF CORONA DISCHARGES AND BREAKDOWN ON POSITIVE ELECTRODES IN HIGH-PRESSURE AIR FOR DIAGNOSTICS OF SURFACE MICROPROTRUSIONS

Dr Nuno Ferreira (Universidade da Madeira)

11/03/2021, 14:00

Oral

Analysis of deviations from the similarity law, observed at high and very high pressures in experiments on discharge ignition and breakdown in corona-like configurations, can serve as a useful, albeit inevitably indirect, source of information about microprotrusions on the surface of electrodes.

Current-voltage characteristics of field electron emission from cold cathodes in vacuum follow...

13. Silicon Field Emitter fabrication by TMAH Etching of convex/concave corners

Mr Andreas Schels (Institute of Physics, Faculty of Electrical Engineering and Information Technology, Universität der Bundeswehr München)

11/03/2021, 14:30

Oral

Recently a novel fabrication method of silicon field emission arrays (FEAs) was introduced by Edler et al. [1], [2]. By combining wafer saw dicing with anisotropic wet chemical etching a versatile, inexpensive and easy reproducible manufacturing process is being presented. In accordance to literature the formation of the tips is explained by the differing etching rates of silicon crystal...

26. A New Experimental Method of beta Estimation

Sagy Itschak Lachmann (Hebrew University of Jerusalem)

11/03/2021, 15:00

Oral

In this talk, I will present a new experimental method of beta estimation that allows for a field-dependent estimation of beta for the first time to our knowledge. I will present the theory behind the method as well as how to use the code supplied for its implementation.

2. Electrostatic discharges on very large spacecrafts solar panels: coupled model of a cathode spot and flash-over expansion in vacuum

Loanne Monnin

Oral

The increase of the onboarded power on Spacecraft is actually still limited by the charging issue due to the plasma natural environment. The charging of the external dielectrics is due to the complex geometry, the number of different materials and the presence of biased conductor. It leads to a high potential difference on solar cells edges that can reach several kilo-volts. In this...