A pulsed plasma device that creates short-lived, extremely hot and dense plasma pinches — producing fusion neutrons, intense X-rays, and high-energy ion beams from a remarkably simple and inexpensive apparatus.
ReviewedLast reviewed: 9 Aug 2026·Category: Concepts & Physics
How It Works
A dense plasma focus (DPF) consists of two coaxial electrodes in a low-pressure gas. A large capacitor bank discharges across the electrodes, creating a plasma sheath that accelerates axially and then radially collapses (pinches) at the electrode tip. The resulting pinch reaches temperatures of 1–10 keV and densities of 1025–1026 m−3 for tens of nanoseconds.[1]
Remarkable simplicity: A DPF can produce fusion neutrons from deuterium at energies as low as a few kilojoules — making it one of the simplest and cheapest devices capable of producing nuclear fusion reactions. Dozens of DPF devices have been built worldwide, including several by universities with modest budgets.
Applications
DPF devices are used as pulsed neutron sources (for materials testing, radiography, and activation analysis), intense X-ray sources (for lithography and medical imaging research), and as platforms for studying extreme plasma physics. They are not considered viable for energy production due to fundamental scaling limitations.[2]
Notable Experiments
The NX series at the National Institute of Education in Singapore, Focus Fusion at LPPFusion (a startup pursuing p-11B fusion), and the PF-1000 at the Institute of Plasma Physics and Laser Microfusion in Warsaw are among the most active DPF research programs.[3]
Sources
Krishnan, M. "The dense plasma focus: a versatile dense pinch for diverse applications." IEEE Transactions on Plasma Science, 40, 3189, 2012.
Lee, S. and Saw, S.H. "Neutron scaling laws from numerical experiments." Journal of Fusion Energy, 27, 292, 2008.
Bernard, A. et al. "Scientific status of plasma focus research." Journal de Physique Colloques, 40, C7-19, 1979.