Migma - Migma Fusion

Migma Fusion

The Migma approach avoided the problem of heating the mass of fuel to these temperatures by accelerating the ions directly in a particle accelerator. Accelerators capable of 100 keV are fairly simple to build, although in order to make up for various losses the energy provided is generally higher. Later Migma testbed devices used accelerators of about 1 MeV, fairly small compared to the large research reactors like Tevatron, which are a million times more powerful.

The original Migma concept used two small accelerators arranged in a collider arrangement, but this reaction proved to have fairly low cross-sections and most of the particles exited the experimental chamber without colliding. Maglich's concept modified the arrangement to include a powerful magnetic confinement system in the target area; ions injected into the center would orbit around the center for some time, thereby greatly increasing the chance that any given particle would undergo a collision given a long enough confinement time. It was not obvious that this approach could work, as positively charged ions would all orbit the magnetic field in the same direction. However, Maglich showed that it was nevertheless possible to produce self-intersecting orbital paths in such a system, and he was able to point to experimental results from the intersecting beams at CERN to back up the proposal with real-world numbers.

Several Migma experimental devices were built in the 1970s; the original in 1972, Migma II in 1975, Migma III in 1978, and eventually culminating with the Migma IV in 1982. These devices were relatively small, only a few meters long along the accelerator beamline with a disk-shaped target chamber about 2 m in diameter and 1 m thick. This device achieved the record fusion triple product (density × energy-confinement-time × mean energy) of 4e keV sec cm−3 in 1982, a record that was not approached by a conventional tokamak until JET achieved 3e keV sec cm−3 in 1987.

Maglich has been attempting to secure funding for a follow-on version for some time now, unsuccessfully. According to an article in The Scientist, Maglich has been involved in an apparently acrimonious debate with the various funding agencies since the 1980s.