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Kyle G Miller¹, Jacob R Pierce², Manfred V Ambat³

¹Laboratory for Laser Energetics, University of Rochester, Rochester, NY, 14623-1299, USA. kmill@lle.rochester.edu.

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Summary

A novel space-time structured laser pulse enables dephasingless laser wakefield acceleration, overcoming limitations of conventional methods. This breakthrough promises compact, high-energy electron acceleration for future colliders and light sources.

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Area of Science:

Plasma Physics
Particle Accelerators
Laser Technology

Background:

Laser wakefield accelerators (LWFAs) offer higher electric fields than conventional accelerators.
Dephasing limits energy gain in single-stage LWFAs as particles outrun the wakefield.
Next-generation light sources and lepton colliders require compact, high-energy accelerators.

Purpose of the Study:

To demonstrate a dephasingless laser wakefield acceleration method using a single space-time structured laser pulse.
To achieve electron acceleration over extended distances beyond the dephasing length.
To improve beam quality and projected energy gains in LWFAs.

Main Methods:

Utilizing a single, space-time structured laser pulse for ionization injection and electron acceleration.
Simulating a dephasingless laser wakefield accelerator in the bubble regime.
Employing a programmable-trajectory focus for the laser pulse, including accelerating focus and reduced spot-size variation.

Main Results:

Demonstrated electron acceleration over 20 dephasing lengths (1.3 cm) to 2.1 GeV with 25 pC charge using a 6.2-J pulse.
Stabilized electron acceleration through focus manipulation, mitigating self-focusing and improving beam quality.
Projected energy gains of 125 GeV in a single, sub-meter stage with a 500-J pulse.

Conclusions:

A single space-time structured laser pulse can overcome dephasing limitations in LWFAs.
This technique enables efficient, high-energy electron acceleration in a compact, single-stage device.
The method holds significant potential for developing advanced light sources and lepton colliders.