Interaction of an Ultrarelativistic Electron Bunch Train with a W-Band Accelerating Structure: High Power and High...

Area of Science:

• Physics
• Particle Accelerators
• Electromagnetism

Background:

• High-frequency structures beyond the microwave regime are crucial for next-generation particle accelerators.
• Electron beam interaction with these structures drives advancements in high-energy physics.

Purpose of the Study:

• To report the generation of multimegawatt pulsed radio frequency (RF) power at 91 GHz.
• To demonstrate a novel planar metallic accelerating structure for high-gradient electron acceleration.
• To introduce a precise control method for RF pulse properties.

Main Methods:

• Utilized an ultrarelativistic electron bunch train to drive a slow-wave wakefield device.
• Developed and applied a two-beam wakefield interferometry method to measure RF pulse properties.
• Varied the bunch separation to control wakefield interference and RF pulse characteristics.

Main Results:

• Successfully generated multimegawatt pulsed RF power at 91 GHz.
• Demonstrated stable RF phase and amplitude control by manipulating the electron bunch train.
• Confirmed the efficacy of the two-beam wakefield interferometry method through energy change measurements of a trailing electron bunch.

Conclusions:

• The developed planar metallic structure effectively generates high-power RF at 91 GHz.
• The two-beam wakefield interferometry method provides precise control over RF pulse properties for accelerator applications.
• This technology holds significant promise for future high-energy frontier machines.