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Experimental Methods for Trapping Ions Using Microfabricated Surface Ion Traps

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Ionization induced trapping in a laser wakefield accelerator.

C McGuffey¹, A G R Thomas, W Schumaker

¹Center for Ultrafast Optical Science, The University of Michigan, Ann Arbor, Michigan 48109, USA.

Physical Review Letters

|April 7, 2010

Summary

This summary is machine-generated.

Adding gases to helium targets in laser wakefield accelerators enhances electron beam charge and reduces divergence. This ionization-initiated trapping mechanism improves electron beam generation for future applications.

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Area of Science:

Plasma Physics
Particle Acceleration

Background:

Laser wakefield acceleration (LWFA) is a promising technique for generating high-energy electron beams.
Electron trapping in LWFA is crucial for beam formation and quality.

Purpose of the Study:

To investigate the effect of adding various gases to helium targets on electron trapping and beam properties in LWFA.
To explore ionization-initiated trapping as a mechanism for enhancing electron beam charge and reducing divergence.

Main Methods:

Experimental studies using laser wakefield accelerators with helium targets doped with controlled amounts of various gases.
Measurements of electron beam charge and divergence.
Particle-in-cell (PIC) modeling including ionization processes.

Main Results:

Adding gases to helium targets increased electron beam charge by up to an order of magnitude compared to pure helium.
Beam divergence decreased significantly from 5.1+/-1.0 mrad to 2.9+/-0.8 mrad.
PIC modeling supported the experimental findings, confirming ionization-initiated trapping.

Conclusions:

Ionization-initiated trapping by controlled gas mixtures is an effective method to enhance electron beam charge and reduce divergence in LWFA.
This mechanism offers a pathway to generate electron beams with lower emittance and higher charge compared to using pre-ionized gas targets.