Direct observation of electrons in microwave vacuum components

Area of Science:

• Physics
• Electrical Engineering
• Vacuum Electronics

Background:

• Microwave vacuum components are crucial for high-power applications.
• Direct electron observation is challenging due to high power and vacuum environments.
• Understanding electron behavior is key to preventing component failure.

Purpose of the Study:

• To design and implement an apparatus for direct electron observation in microwave vacuum components.
• To enable local detection of electrons with high temporal resolution.
• To establish a foundation for future multipactor discharge studies.

Main Methods:

• A WR-284 waveguide was modified by reducing its height to 6 mm to increase electric field levels.
• An aperture allowed electrons to enter an electron multiplier tube for detection.
• Measurements were performed in the dominant TE10 mode at 2.85 GHz with up to 1 MW power.

Main Results:

• Direct measurement of electrons within the waveguide was achieved.
• The apparatus demonstrated nanosecond temporal resolution for electron detection.
• Waveforms confirmed the successful implementation of the electron observation system.

Conclusions:

• The developed apparatus enables direct, high-resolution electron observation in microwave waveguides.
• This technique provides valuable insights into electron dynamics under high microwave power.
• The setup is a promising tool for investigating phenomena like multipactor discharge.