I think there are many variations on the idea that have been proposed, e.g. StarTram [1]. Wikipedia in general is a good starting point to look at some of the

I think there are many variations on the idea that have been proposed, e.g. StarTram [1]. Wikipedia in general is a good starting point to look at some of the launch methods proposed over the years [2]. [1] https://en.wikipedia.org/wiki/StarTram https://en.wikipedia.org/wiki/StarTram [2] https://en.wikipedia.org/wiki/Non-rocket_spacelaunch https://en.wikipedia.org/wiki/Non-rocket_spacelaunch