In reply to Bob Higgins's message of Sat, 2 Dec 2017 07:01:42 -0700:
>Hi Robin, Can you supply a link? The only thing I can find with ion
>thrusters is that the magnetic field is used to prevent the ions from
>striking the side walls. I didn't find anything that suggests that a
>magnetic field can turn high energy ion trajectories from an
>omnidirectional source into unidirectional thrust. Magnetic fields only
>make the ion path curl.
This appears to be relevant:- https://patents.google.com/patent/US7482597B2/en
See also https://en.wikipedia.org/wiki/Magnetoplasmadynamic_thruster
Try Googling "MPD thrusters"
Robin van Spaandonk
local asymmetry = temporary success