I'm all for new space launch concepts - it just intuitively seems like a mass driver or spacegun should be a cheaper method for cargo etc. But has anyone attemp

I'm all for new space launch concepts - it just intuitively seems like a mass driver or spacegun should be a cheaper method for cargo etc. But has anyone attempted to validate the Launch loop concept with even a scale model? It seems so far beyond what we know that I have trouble taking it seriously.