Cycler

Cyclers could be used for carrying heavy supplies, life support and radiation shielding.

A cycler encounters two or more bodies regularly by employing a free-return trajectory, this trajectory was analysed by Arthur Schwaniger in 1963 with a symmetrical orbit past the Moon and Earth.

An interstellar cycler would never slow down and use Lorentz force for turning.

The envisioned benefit is that the life support for an interstellar vehicle wouldn't have to be accelerated, only the payload, allowing more to be carried for a given energy budget.

Norem in a 1969 paper[7] and popularized by Karl Schroeder in his 2002 novel Permanence.

Sketch of a circumlunar free return trajectory (not to scale), plotted on the rotating reference frame rotating slightly faster than a sidereal month.