Note: Thermal analysis of the long line source electron gun

Area of Science:

• Physics
• Materials Science
• Engineering

Background:

• Previously reported long linear filament electron gun assembly.
• Need for thermal analysis to ensure operational stability at high temperatures.

Purpose of the Study:

• To perform thermal analysis of the electron gun assembly using ANSYS software.
• To evaluate temperature distribution, thermal strain, and heat flux.
• To validate theoretical findings with experimental results.

Main Methods:

• Utilized ANSYS software for finite element thermal analysis.
• Applied a thermal load of 3000 °C to the electron gun.
• Conducted experimental validation of the electron beam characteristics.

Main Results:

• Calculated maximum heat flux of 9.0 W/mm² at focusing electrodes, resulting in a thermal strain of 0.05.
• Determined minimum heat flux of 0.3 W/mm² at anode electrodes with negligible thermal strain.
• Experimentally verified a uniform electron beam cross-section comparable to filament size.

Conclusions:

• The electron gun assembly is thermally stable under high-temperature operation.
• Theoretical thermal analysis results align with experimental findings.
• The gun demonstrated continuous operation for several hours without thermal failure.