Construction of a Space Elevator (SE) system on the Earth will have many challenges, not least the ability to demonstrate an adequate Technology Readiness Level (TRL) before the construction of an Earth system. This paper discusses methods of growing the TRL, concentrating on the intermediate project stages and outlining possible smaller-scale demonstrator systems : these would rehearse construction and dynamic control techniques whilst building long-duration reliability and durability experience on climber and material designs. The paper will argue that limited 'pathfinder' tether systems could be tested in the near-Earth locale to meet TRL5 needs, followed by more complex demonstrations for TRL6 on suitable asteroids : these asteroids could be selected to align with asteroid mining ventures, simplifying logistic issues and providing a reduced-propellant shipping method for mined material. Results of a simple analysis for four asteroids are included. For TRL7, one or more demonstrator SE systems are suggested for Mars : this would prove the viability of SE construction and control techniques in a planetary gravity field, with a bonus of supporting proposed human colonisation plans. Extended operation of these precursor demonstration systems will be essential to grow the Space Elevator TRL to enable the go-ahead for construction of an Earth system (TRL8-9).
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