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Analysis of Gaussian beam and Bessel beam driven laser accelerators
B Hafizi1, A K Ganguly, A Ting
1Omega-P, Inc., P.O. Box 202008, New Haven, CT 06520-2008, USA.
Summary
Gaussian beams achieve higher particle energy gain than Bessel beams in vacuum beat wave accelerators (VBWA). Simulations show Gaussian beams yield 2-3 times greater energy gain, offering improved laser accelerator performance.
Area of Science:
- Plasma Physics
- Particle Acceleration
- Laser Technology
Background:
- The vacuum beat wave accelerator (VBWA) uses two laser beams to accelerate particles.
- Bessel and Gaussian beams exhibit distinct phase behaviors near focal regions.
Purpose of the Study:
- Compare particle energy gain and beam quality between Gaussian and Bessel beam driven VBWAs.
- Investigate the impact of beam type on laser accelerator performance.
Main Methods:
- Analytical modeling including v x B interaction.
- 3D finite-emittance simulations with detuning and transverse displacements.
- Huygens' principle for Bessel beam field determination.
Main Results:
- Analytical models predict equal energy gain for both beam types at equal laser powers.
- Simulations reveal Gaussian beams yield 2-3 times greater energy gain than Bessel beams.
- Resulting particle beams are azimuthally symmetric, collimated, with small angular divergence.
Conclusions:
- Gaussian beams offer superior performance in VBWAs compared to Bessel beams.
- 3D simulations highlight the importance of electromagnetic field components and beam dynamics.
- VBWA performance is sensitive to beam characteristics and interaction parameters.