Physicists have shown that an x-pinch — a dense plasma filament produced by a high-current electrical discharge — can accelerate protons radially outward, creating a point-like source suitable for proton radiography. The work, published on Phys.org, marks a shift from using plasma pinches primarily for fusion research to leveraging them as practical imaging tools.
The finding matters because proton radiography offers higher density contrast than X-rays for certain applications, such as imaging through dense materials or in inertial confinement fusion experiments. The radial acceleration geometry may enable crisper, more isotropic images compared to conventional linear accelerator sources.
In experiments, the x-pinch generated protons with energies sufficient for radiography, though exact energy ranges were not specified in the report. The source size was described as being on the order of micrometers, contributing to high spatial resolution. The team noted that the approach is more compact and potentially lower-cost than traditional proton sources.
This could lead to tabletop proton radiography setups for laboratory use, expanding access for materials science, plasma diagnostics, and security imaging. Researchers are now exploring ways to optimize the proton yield and energy distribution for practical deployment.
The authors caution that current proton flux remains lower than that from large-scale accelerators, limiting immediate replacement of existing systems. Further work on scaling the x-pinch energy and repetition rate is needed.