Comprehensive modeling of microscale gas breakdown under extremely high electric field

Area of Science:

• Plasma Physics
• Electrical Engineering
• Materials Science

Background:

• Microscale gas breakdown under high electric fields is crucial for miniaturized electronic devices.
• Existing models often lack comprehensive physical mechanisms for extreme field conditions.

Purpose of the Study:

• To develop theoretical models for microscale breakdown under extremely high electric fields.
• To elucidate the distinct breakdown characteristics in helium and argon.
• To provide insights for the insulation design of miniaturized gaseous electronic devices.

Main Methods:

• Incorporation of physical mechanisms: field emission, electron runaway, ion impact ionization, and fast atom dynamics.
• Development of theoretical models for microscale breakdown.
• Analysis of breakdown characteristics in helium and argon.
• Investigation of electrode surface roughness effects on breakdown.

Main Results:

• Accurate prediction of experimental and simulation trends for microscale breakdown.
• Explicit revelation of multivalued breakdown curves in helium and single-valued curves in argon.
• Indication that strong field-driven heavy particle reactions favor smooth electrodes over rough ones.
• Proposal of simplified breakdown models for argon and helium under strong field conditions.

Conclusions:

• The developed theoretical models accurately capture microscale breakdown phenomena under extreme electric fields.
• Understanding gas-specific breakdown mechanisms and electrode properties is vital for device insulation.
• Simplified models offer valuable theoretical references for designing reliable miniaturized gaseous electronic devices.