What is the highest man-made temperature?

Answer 1

First of all, I would like to tell everyone that reaching the "upper levels" isn't nearly as important as finding out a way to reach within an attokelvin of absolute zero (that is about 0.000000000000000001° kelvin). However, the highest temperature we've ever gotten is 2.3 billion degrees Fahrenheit (2,300,000,000°F).

Answer 2

The highest man-made temperature ever recorded was 9.9 billion degrees Fahrenheit, achieved in 2012 at the Large Hadron Collider. At such extreme temperatures, matter breaks down into its fundamental components, providing insight into the behavior of particles at the beginning of the universe.