High velocity low altitude fusejet

By combining an existing idea http://www.newscientist.com/mobile/arti ... craft.html with my own idea, using a maglev launcher to accelerate to insane speeds a ground level, and shield the ship with an intense magnetic plasma shield, could be made into a new type of fusion engine, that is fed pre-heated plasma from the heat shield, and relies on the plasma pressure to boost its magnetic density, a device like this might break even easier because it exploits a high energy threshold first stage and support to initiate the fusion, and then the reaction would carry it to space.

Any ideas on how to generate microwaves from plasma?

Different elements radiate at different temperatures (frequency) in a plasma state. If you intake material is air, then what wavelength does nitrogen and oxygen radiate at? If you can't use that "easy" way, then there might be a way to magnetically twist the plasma to excite and emit...