Ok I was wrong. The concept may probably reduce the Bremsstrahlung with no help by strong magnetic fields.
The electrons are drawn to the outer electrode and the ions to the void in the central electrode.
Hence few electron-ion collisions and for that reason little X-ray cooling. There seems to be several ways to go round Todds thesis.
More links.
http://fti.neep.wisc.edu/iec/ftisite1.htm
http://fti.neep.wisc.edu/fti
