FN-II Dense Plasma Focus

Intelligence Summary: FN-II — Dense Plasma Focus Device

Node Identity: The FN-II is a Dense Plasma Focus (DPF) device — a compact, pulsed-power-driven plasma system — operated at INPE/LAP and associated with the University of São Paulo (USP). It is a Mather-type DPF with energy storage of less than 5 kJ, designed for plasma physics and neutron generation research. The device produces DD (deuterium-deuterium) neutron bursts through inertial confinement of magnetized plasma pinches, with measured neutron generation rates in the 10⁶–10⁸ n/s range. CR-39 nuclear track detectors and silver activation counters are used for neutron diagnostics.

Strategic Relevance: The FN-II represents Brazil's capability in dense plasma focus technology — a compact pulsed-power plasma device with inherent dual-use characteristics. DPF devices produce intense neutron bursts, X-rays, and energetic particle beams, making them relevant to fusion material testing, neutron source development, and potentially nuclear weapons diagnostics. While FN-II operates at very low yields (10⁶–10⁸ n/s) compared to weapons-relevant systems, the underlying physics of plasma focusing, neutron generation, and pulsed-power technology creates a knowledge base transferable to more advanced applications. Brazil's DPF program contributes to the country's broad plasma science ecosystem spanning fusion, technological plasmas, space plasmas, and plasma medicine.

Technical Focus / Capabilities: FN-II research focuses on neutron yield anisotropy, angular distribution of emitted neutrons, and X-ray production characterization. The device studies the fundamental physics of plasma focus dynamics — the formation, acceleration, and pinching of plasma sheaths in coaxial electrode geometries. This includes investigation of the Mather-type DPF configuration where a current sheath is accelerated along coaxial electrodes before collapsing radially at the anode tip to form a dense, hot plasma column. The device's compact size (<5 kJ) makes it suitable for university-scale research and diagnostic development.

Network Linkage: FN-II is operated by LAP (Laboratório Associado de Plasmas) at INPE, connecting it to the broader Brazilian plasma ecosystem including USP, UNICAMP, and ITA. The transfer of fusion activities from INPE to CNEN brings FN-II-related research under nuclear authority oversight, with IAEA Safeguards providing international monitoring. The DPF technology connects to global plasma focus research networks, including the Asian African Association for Plasma Training (AAAPT).