JT-60SA operations restarted on 30 May when the flanges providing access to the cryostat were sealed closed again and vacuum pumping started. This was a big moment for us after the long suspension for improvement works!
Evacuation of both the vacuum vessel, which will eventually contain the tokamak plasma, and the cryostat surrounding the machine core proceeded smoothly. Now both the cryostat and the numerous helium pipes inside it, which will supply coolant to the superconducting magnets, have been successfully leak tested.