Jet impingement was introduced in the 1950's through research in Japan for the effective cooling of thermo-nuclear reactors approaching melt-down. Jet impingement was found back then to be the most effective form of thermal energy transfer.
Multiple jet impingement ideas have been around in various forms since then, with the earliest dating back to the 1960's that I'm aware of, and certainly before I was born ('69).
As jaydee116 points out above, where the Cascade differs, or rather, extends that JI concept is with the cupping.
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