Bright electron bunches from a plasma-wakefield accelerator with a steep density down-ramp

Area of Science:

• Particle Physics
• Photon Science
• Accelerator Physics

Background:

• High-brightness electron bunches are essential for advanced research.
• Space charge forces in radiofrequency accelerators degrade electron bunch quality.
• Plasma accelerators offer higher accelerating fields and methods for low emittance bunch creation.

Purpose of the Study:

• To demonstrate injection and acceleration of high-quality electron bunches in a plasma accelerator.
• To achieve gigavolt-per-meter acceleration gradients.
• To show excellent reproducibility in plasma-based electron acceleration.

Main Methods:

• Utilizing plasma acceleration techniques for electron bunch manipulation.
• Demonstrating injection of electron bunches into a plasma wakefield.
• Achieving relativistic velocities to minimize space charge effects.

Main Results:

• Successfully injected and accelerated electron bunches with mm-mrad normalized emittance.
• Achieved spectral density of O(10 pC/MeV).
• Demonstrated percent-level energy spread with excellent reproducibility.

Conclusions:

• Plasma accelerators can produce high-brightness electron bunches.
• This method is effective even with lower-quality drive bunches.
• The demonstrated technique shows promise for future high-energy physics and photon science applications.