At least 2 particle accelerators are used to balance each other and counter each other's tendency to make the craft spin. Otherwise, the machine would tend to want to start spinning, following the direction of the force being applied to the particles. The accelerators push in opposite directions. As the pilot and crew travel in space, outside the magnetic field of a world, water from a tank is electrically separated into oxygen and hydrogen. The high speed particles go out through straight lengths of pipe, charged like the loops and in speeding out into space, push the machine along.
Doors control which pips the particles leave from.
This avoids the severe problems of weightlessness, including lowered physical abilities of the crew. It is possible to use straight-line particle accelerators, even as few as one per machine, but these don't seem as able to get the best machine speed for the least amount of particles pushed out. Page 4 Using a constant acceleration of 32.2 feet per second per second provides earth normal gravity in deep space and only 2 gravities of stress in leaving the earth's gravity field. It takes the same distance to decelerate as it does to speed up, but this cuts down the time delay that one would have in conventional chemical rocketry enormously, for a long journey. A set of superconducting magnets can be charged by metal sheet circuits, within limits, to whatever frequency is needed and will continue to transmit that magnetic field frequency almost indefinitely.