Design Considerations for the Multi-stage Space Elevator

 The study team took on the challenge of expanding the body of knowledge pertaining to the Multi-stage Space Elevator.

To build a space elevator, the toughest challenge is to find material that is strong enough for a self-supporting tether. Building it in multiple stages is a way of overcoming that challenge. Using the concept of dynamically supported structures, it is possible to build upwards from the earth’s surface and provide supports for the lowest parts of the tether, where gravity is strongest. A five-stage design would support a tether made of carbon fiber yarn that is commercially available today. A two-stage design can support a tether with less than one-third of the strength previously thought necessary.

The known technologies of magnetic levitation and evacuated tubes are required together with some recently developed techniques for maintaining stability and supporting continuous operation. A substantial submarine (or underground) structure is required, but the capacity and operations of climbers are similar to those previously proposed. The overall mass of the tether also remains much the same. Provision has been made for dealing with space debris.