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Cryogenic Liquid Jets for High Repetition Rate Discovery Science

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Efficient Laser-Driven Proton Acceleration from a Cryogenic Solid Hydrogen Target.

J Polz¹, A P L Robinson², A Kalinin³

¹Institut für Optik und Quantenelektronik, Friedrich-Schiller-Universität, 07743, Jena, Germany.

Scientific Reports

|November 13, 2019

Summary

This summary is machine-generated.

Researchers successfully used a cryogenic solid hydrogen target to accelerate protons using high-power lasers. This method achieved high-energy proton beams with potential for future applications in laser-driven particle acceleration.

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Area of Science:

Plasma Physics
Laser-Plasma Interactions
Particle Acceleration

Background:

High-power laser systems enable novel approaches to particle acceleration.
Developing efficient and stable targets is crucial for laser-driven acceleration.

Purpose of the Study:

To implement and characterize a cryogenic solid hydrogen target for laser-driven proton acceleration.
To investigate the properties of protons accelerated by high-power lasers interacting with solid hydrogen.

Main Methods:

Irradiation of a 10 μm diameter solid hydrogen filament with 10-Terawatt laser pulses (2.5 J energy).
Characterization of accelerated proton spectra and emission properties.
Two-dimensional particle-in-cell simulations to model the interaction and shock dynamics.

Main Results:

Observation of protons with kinetic energies exceeding 20 MeV.
Protons exhibited non-thermal spectral features and were emitted over a large solid angle.
A total conversion efficiency of several percent was achieved.
Simulations confirmed collisionless shocks launched from the target surface caused spectral modulations.

Conclusions:

Cryogenic solid hydrogen targets are effective for high-power laser-driven proton acceleration.
The observed spectral modulations are attributed to collisionless shock waves.
Solid hydrogen targets offer improved prospects for laser-accelerated proton pulses in future applications.