X-pinch plasma achieves radial proton acceleration for enhanced imaging techniques

A groundbreaking study from the Czech Technical University in Prague and the University of Michigan Engineering has unveiled a new mechanism for radial proton acceleration in X-pinch plasma. Published on July 8, 2026, this research highlights the potential of the radial acceleration mechanism to revolutionize proton radiography.

Advancements in Proton Radiography

The team discovered that protons could be accelerated to 3 mega electron volts (MeV) using relatively compact devices operating at a peak current of 400 kiloamperes (kA). This innovation makes proton radiography, a technique essential for imaging the rapid evolution of electric and magnetic fields in plasma, accessible to a wider range of laboratories.

Previously, proton radiography required large and costly laser facilities, such as the OMEGA and OMEGA-EP systems at the University of Rochester's Laboratory for Laser Energetics. According to Ryan McBride, a professor of nuclear engineering at U-M and senior author of the study, "This new proton radiography capability will lead to a better understanding of pinch physics in general, potentially leading to advances in nuclear fusion research."

How X-pinch Plasma Functions

The concept of the plasma pinch, specifically the Z-pinch, has been pivotal in the quest for controlled nuclear fusion. In this arrangement, a cylindrical column of ionized gas is aligned with the z-axis, and a pulsed-power generator sends a massive electric current through the plasma. This current generates a strong magnetic field that compresses the plasma inward.

This compression typically results in a burst of X-rays and accelerated protons emitted in the axial direction. However, the hybrid X-pinch configuration utilized in this study focuses on generating protons from a shorter pinch column, leading to clearer imaging outcomes.

Innovative Hybrid X-pinch Configuration

In the experiments conducted at the MAIZE facility at U-M and the XP facility at Cornell University, the researchers employed a hybrid X-pinch setup. They utilized a polyethylene fiber measuring just 30 micrometers thick, positioned between conical electrodes to form the X-shape.

The electric current pulse vaporizes the fiber into a plasma column, while the X-shape of the electrodes focuses the magnetic pressure. This precise configuration results in a rapid disintegration of the fiber, causing a disruption in the current flow and leading to an explosive increase in voltage. Consequently, protons are propelled radially at near-relativistic speeds.

The study marks a significant leap in the capabilities of proton radiography, paving the way for new research opportunities in high-energy-density plasma research and nuclear fusion science.