According to the late Dr. Robert Forward, if one rotates a massive object (or stream of objects) around a toroidal field (as shown in the illustration at the bottom left of your post), one will produce a gravitomagnetic field (i.e., artificial gravity) about the torus (shown in blue in the illustration).. A object encountering this field will be accelerated without inertial effects along the field lines (shown in red in the illustration) with a velocity proportional to the strength of the field.
In other words, if you built such a torus out in space, you could "drop" a ship into its vicinity and the artificial gravity field around the torus would "kick" the ship out into space at an arbitrailty high speed and without subjecting the passengers to any g-forces whatsoever.
Thanks for an interesting post.
Re above post: for bottom left read bottom right. Sorry for the dysgraphia.
Just guessing. I really have no idea. Pretty cool to think about, though.
The more we learn, the more we realize we don't know.