After a supernova, a newly formed neutron core has an initial temperature of about 100 billion kelvin, 6000 times the temperature of the sun’s core. The record temperature, that achieved at the LHC, over 5 trillion K and perhaps as high as 5.5 trillion K is around 5000-5500 times hotter than that! Or about 30-33 million times hotter than that of the sun’s core! During the experiment, the hottest place in the Universe was here on Earth.
Image: Artist’s impression of a Type II supernova explosion which involves the destruction of a massive supergiant star. A Type II supernova results from the rapid collapse and violent explosion of a massive star. A star must have at least 8 times, but no more than 40 to 50 times, the mass of the Sun (M☉) to undergo this type of explosion.