Demonstration of a compact plasma accelerator powered by laser-accelerated electron beams

Area of Science:

• Particle Accelerators
• Plasma Physics
• Laser-Electron Interactions

Background:

• Plasma wakefield accelerators offer extremely high accelerating fields (GV/cm), far exceeding conventional accelerators.
• Beam-driven wakefields are promising for generating high-quality particle beams but typically require kilometer-scale facilities.
• Existing accelerator technologies face limitations due to the electric breakdown threshold.

Purpose of the Study:

• To demonstrate a miniaturized plasma accelerator operating on a millimeter scale.
• To investigate the acceleration of electron beams using laser-accelerated drive beams.
• To explore energy transfer mechanisms in beam-driven plasma wakefields using controlled electron bunches.

Main Methods:

• Utilized laser-accelerated electron beams to drive plasma wakefields in a millimeter-scale device.
• Employed a hybrid approach with controlled drive and witness electron bunches to study energy transfer.
• Conducted particle acceleration experiments and compared results with simulations of plasma wakefield dynamics.

Main Results:

• Successfully accelerated electron beams to 128 MeV within a millimeter-scale device.
• Achieved accelerating gradients exceeding 100 GV/m, consistent with theoretical predictions.
• Demonstrated controlled energy transfer from a drive bunch to a witness bunch via plasma wakefields.

Conclusions:

• A millimeter-scale plasma accelerator powered by laser-accelerated electron beams has been successfully demonstrated.
• This miniaturized approach achieves high accelerating gradients, overcoming limitations of conventional accelerators.
• The technology holds promise for compact sources of high-brightness electron beams for applications like free-electron lasers.