An ITER-like wall for JET

Abstract This article presents an overview of the new ITER-like wall project in JET. It aims at an optimal use of JET’s unique features: physical size, plasma parameters most closely to ITER and the capability to handle beryllium and tritium, allowing the study of critical questions related to operating within the limits of the ITER wall materials. A full replacement of the first wall materials is planned (beryllium in the main wall and tungsten in the divertor). This should deliver answers to urgent plasma surface interaction questions such as tritium retention and provide operational experience in steady and transient conditions with ITER wall materials under relevant geometry and relevant plasma parameters. In addition, the JET auxiliary heating power will be upgraded to ∼45 MW, allowing access to ITER-relevant disruption and edge localised modes energy loss densities. This will open access to conditions of melt layer formation both on the beryllium first wall and the tungsten divertor.