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Sample Preparation and Experimental Design for In Situ Multi-Beam Transmission Electron Microscopy Irradiation Experiments

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Fast Heating of Imploded Core with Counterbeam Configuration.

Y Mori¹, Y Nishimura¹, R Hanayama¹

¹The Graduate School for the Creation of New Photonics Industries, 1955-1 Kurematsuchou, Nishi-ku, Hamamatsu 431-1202, Japan.

Physical Review Letters

|August 13, 2016

Summary

This summary is machine-generated.

Counterirradiation of laser-imploded cores significantly enhances photon emission and neutron production. This phenomenon is driven by Weibel instability, which generates magnetic filaments that trap fast electrons, improving energy coupling.

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Area of Science:

Plasma Physics
Laser-Matter Interaction
High-Energy-Density Physics

Background:

Laser-imploded cores are crucial for inertial confinement fusion research.
Efficient energy coupling into the core is a key challenge.
Understanding particle acceleration and emission mechanisms is vital.

Purpose of the Study:

To investigate the effects of counter-irradiating laser pulses on laser-imploded cores.
To quantify the enhancement in photon emission and energy coupling.
To explore the underlying physical mechanisms, including magnetic field generation and particle trapping.

Main Methods:

Experimental setup involving a tailored-pulse-imploded core (70 μm diameter) irradiated by counterpropagating 110 fs, 7 TW laser pulses.
Measurement of photon emission (>40 eV) and neutron production.
Collisional two-dimensional particle-in-cell (PIC) simulations to model plasma dynamics.

Main Results:

Photon emission increased sixfold compared to the imploded core alone, with only one-seventh the heating pulse energy.
Observed a 14% coupling efficiency from the heating laser to the core.
PIC simulations revealed Weibel instability generating mega-Gauss magnetic filaments from counterpropagating fast-electron currents.
These filaments trap MeV-range fast electrons, enhancing energy coupling and explaining bright photon emissions.

Conclusions:

Counterirradiation is a highly efficient method for enhancing photon emission and energy coupling in laser-imploded cores.
Weibel instability and subsequent magnetic filament formation play a critical role in fast electron trapping and energy deposition.
This approach offers a promising avenue for advanced inertial confinement fusion schemes and laboratory astrophysics.