First Light Fusion announced last week that it has set a new record for the highest quartz pressure achieved on Sandia National Laboratories’ Z machine using its amplifier technology to achieve an output pressure of 3.67 terapascal (TPa)—roughly doubling the pressure the company reached in its first experiment on the machine one year ago.

Inside a new steel-clad facility nicknamed “The Citadel,” First Light Fusion has installed a 22-meter two-stage gas gun—the third-largest such component in Europe.