ITER’s Boronization System: Preparing the Tungsten Wall for Fusion’s Next Frontier
In a monumental step for fusion research, engineers and scientists at ITER are advancing the design of a boronization system to condition the plasma-facing walls of the tokamak. As ITER prepares to switch from beryllium to tungsten armour tiles in its plasma chamber, this new system is essential for mitigating impurities and ensuring efficient plasma performance. Why Boronization Matters Boronization involves coating plasma-facing surfaces with an ultra-thin layer of boron (10–100 nanometers) to capture oxygen impurities that can increase radiative losses. This is especially critical during the discharge-initiation phase, when plasma stability is most sensitive. ITER’s boronization system represents the largest-scale application of this proven technology, adapted for a tritiated environment never attempted before. The System in Detail The process uses diborane (B 2 H 6 ) mixed with helium as a carrier gas, delivered via a vast network of over one kilometre of gas inject...