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All-optical cascaded laser wakefield accelerator using ionization-induced injection.

J S Liu¹, C Q Xia, W T Wang

¹State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China.

Physical Review Letters

|August 16, 2011

Summary

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Researchers generated a near-GeV electron beam using a cascaded laser wakefield accelerator (LWFA). This method separates electron injection and acceleration, paving the way for multi-GeV laser accelerators.

Area of Science:

Plasma Physics
Particle Acceleration
Laser-Plasma Interactions

Background:

Laser wakefield acceleration (LWFA) is a promising technique for compact particle accelerators.
Achieving high-energy electron beams requires precise control over injection and acceleration stages.
Cascaded LWFA schemes offer potential for higher energy gains.

Purpose of the Study:

To demonstrate controlled electron injection and acceleration in a cascaded LWFA.
To generate a quasimonoenergetic electron beam with near-GeV energy.
To investigate the feasibility of multi-GeV laser accelerators.

Main Methods:

Utilized a two-stage cascaded laser wakefield accelerator.
Employed two gas cells: one with He/O2 for ionization-induced injection, the second with pure He for acceleration.

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Seeded electrons from the first stage into the second stage for further acceleration.

Main Results:

Successfully separated electron injection and acceleration into distinct LWFA stages.
Generated a 0.8-GeV quasimonoenergetic electron beam.
Achieved a high acceleration gradient of 187 GV/m.

Conclusions:

The demonstrated cascaded LWFA scheme enables controlled generation of high-energy electron beams.
This approach is a significant step towards developing multi-GeV laser-driven electron accelerators.
The technique shows promise for future compact and powerful accelerator designs.