Conveners
Field emission
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Field emission
- Sergio Calatroni (CERN)
Field emission is fundamental to electron microscopy, vacuum interrupters, and high-gradient structures in vacuum. However, conventional models based on the Fowler-Nordheim and Murphy-Good equations often fall short when applied to broad-area electrodes in real-world conditions. Their predictive effectiveness is limited due to their heavy dependence on precise data on emission site geometry...
In the present work, the theory of field emission from surfaces covered with both dielectric coatings and naturally formed oxide layers or adsorbates is considered.
A modified Fowler-Nordheim theory was used to describe the field emission processes, considering the two-layer potential barrier formed by the dielectric coating. This allowed us to create analytical models for calculating the...
Avalanche Energy’s Orbitron, a next-generation compact fusion device, requires the reliable transmission of hundreds of kilovolts of direct current (kVDC) into a vacuum maintained at pressures below 10⁻⁸ Torr. To address this, a novel compact feedthrough is under development and successfully transmits voltages exceeding 300 kV. A major challenge in this effort is mitigating vacuum breakdown...
In the last 15 years there has been renewed interest in vacuum field effect transistors (VacFETs) with nanoscale feature sizes for their potential to transcend performance limitations associated with solid state transistors while maintaining some of the benefits of complex scaling and large-scale batch fabrication common to integrated circuits. Specifically, the vacuum channel of a VacFET...
