Bogdan Castle Maglich (1928–2017) was a Yugoslav‑born American experimental nuclear physicist who became widely known for advocating and developing a colliding‑beam fusion approach called "Migma." Born in Sombor, then part of Yugoslavia, he emigrated to the United States and spent much of his career building and testing experimental devices intended to demonstrate a path toward aneutronic fusion — fusion reactions that produce little or no neutrons and therefore less long‑lived radioactivity.

Overview of the Migma concept

Migma is a specialized colliding‑ion storage concept in which ions are accelerated and stored on intersecting orbits so that they collide at high relative energies. Maglich proposed that, by using self‑focused beams and particular magnetic confinement geometries, a sufficiently high rate of fusion between selected low‑neutron fuels (for example proton–boron) could be obtained without producing large neutron fluxes. He built a sequence of laboratory prototypes — four models are commonly reported — to test aspects of the idea and to measure reaction rates and confinement behavior.

Characteristics and technical aims

  • Target: aneutronic fusion reactions with reduced neutron production.
  • Method: colliding ion beams stored in a magnetic configuration to maximize collision probability.
  • Apparatus: compact experimental devices often described as beam‑storage or beam‑trap systems.
  • Goal: direct conversion of charged fusion products to electricity, improving overall efficiency and lowering radioactive waste.

Maglich promoted the potential advantages of an aneutronic route for cleaner, safer fusion energy and sought to demonstrate practical confinement and reaction rates in the laboratory.

Reception, challenges and legacy

Although Maglich attracted attention for the novelty of his proposals and for persistent experimentation, his claims were greeted with skepticism by much of the fusion community. Fundamental physical limits — including the Lawson criterion for net energy gain, beam losses, ion heating, and radiative losses such as bremsstrahlung for some aneutronic fuels — have proved hard to overcome. Experimental Migma machines demonstrated interesting beam physics but did not achieve a practical net‑power demonstration.

Today Maglich is remembered as an inventive and controversial figure who explored an unconventional route to fusion. His work stimulated discussion about alternative confinement schemes and the technical hurdles that any aneutronic approach must clear. For further contemporary references and archival materials, see related sources.