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High-Flux Neutron Generator Based on Laser-Driven Collisionless Shock Acceleration.

Y L Yao1, S K He2, Z Lei1

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|July 28, 2023
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Summary
This summary is machine-generated.

A new laser-driven neutron generator using collisionless shock acceleration (CSA) produces higher neutron yields than previous methods. This compact, high-flux source offers significant advantages for neutron generation applications.

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Area of Science:

  • Plasma Physics
  • Nuclear Fusion
  • Particle Acceleration

Background:

  • Traditional neutron sources often face limitations in flux and purity.
  • Laser-driven acceleration techniques offer novel pathways for compact neutron generation.
  • Collisionless Shock Acceleration (CSA) presents an alternative to Target Normal Sheath Acceleration (TNSA).

Purpose of the Study:

  • To propose and experimentally verify a novel compact high-flux neutron generator.
  • To investigate the advantages of CSA over TNSA for deuteron acceleration and neutron production.
  • To demonstrate a significant increase in neutron yield using the CSA method.

Main Methods:

  • Utilizing a pitcher-catcher configuration for laser-driven collisionless shock acceleration.
  • Experimentally measuring deuteron energy spectra and forward neutron flux.
  • Employing self-consistent simulations to validate experimental results and predict performance at higher laser intensities.

Main Results:

  • Observed a characteristic CSA plateau in the deuteron energy spectrum (2–6 MeV).
  • Achieved a forward neutron flux of 6.6×10^7 n/sr from a LiF catcher target.
  • Demonstrated an order of magnitude higher neutron yield compared to the TNSA method at 10^19 W/cm^2 laser intensity.

Conclusions:

  • CSA is a highly effective mechanism for producing high-flux, high-energy deuterons, leading to enhanced neutron yields.
  • The proposed CSA-based neutron generator shows significant potential for compact, high-performance neutron sources.
  • Simulations predict achievable neutron yields up to 5×10^10 n/sr at higher laser intensities (10^21 W/cm^2).