Proton emission from a laser ion source

Area of Science:

• Plasma Physics
• Laser-Ablation Ion Sources
• Materials Science

Background:

• Nanosecond pulsed lasers at high intensities (10^10 W/cm^2) can ablate solid targets, producing ions with varying charge states and kinetic energies.
• Proton production using laser-induced plasma is of interest for applications requiring controllable ion beams.
• Hydrogenated targets, including polymers and hydrates, are suitable for generating protons via laser ablation.

Purpose of the Study:

• To investigate the production of protons with controllable energy and current using laser ablation.
• To explore the effect of nanostructures embedded in hydrogenated targets on proton emission characteristics.
• To compare laser-driven proton sources with traditional proton ion sources.

Main Methods:

• Irradiation of roto-translating hydrogenated targets (polymers, hydrates) with a nanosecond pulsed Nd:YAG laser at 1-10 Hz repetition rate in high vacuum.
• Embedding carbon nanotubes or metallic nanostructures within polymer targets to modify laser absorption and plasma properties.
• Characterization of ion beam properties, including proton yield, energy, and current, using ion collectors, ion energy analyzers, and time-of-flight mass spectrometers.

Main Results:

• High emission of ions, including protons, was achieved with controllable energy and current.
• Carbon nanotubes enhanced laser absorption and hydrogen uptake, leading to high proton yields.
• Metallic nanostructures increased plasma electron density and the kinetic energy of accelerated protons.
• Laser-driven proton source performance was compared to traditional proton ion sources.

Conclusions:

• Laser ablation of nanostructure-modified hydrogenated targets offers a promising method for generating controllable proton beams.
• Nanomaterial integration provides a pathway to optimize proton yield and energy for laser-driven ion sources.
• This technique presents a viable alternative or complement to conventional proton ion sources.