 MAST Upgrade is a new tokamak fusion experiment at UKAEA’s Culham Centre for Fusion Energy, building on the success of it predecessor – the MAST tokamak.The upgrade, which is costing £45M, started in 2013 when MAST stopped operating and is designed to significantly enhance MAST’s capabilities in terms of heating power, plasma current, magnetic field and pulse length.MAST Upgrade is currently being commissioned, ready to start operation in late 2020.