Re-design of ITER Glow Discharge Cleaning system based on a fixed electrode concept

• This paper summarizes the approved new design of ITER GDC.
• It is based on the fixed electrode design instead of the previous movable concept.
• Estimates were made on the glow current density.
• R&D topics on initiation, steady state and heat load were presented.
• Other relevant considerations were listed in an exhaustive manner.

A new design of ITER Glow Discharge Cleaning (GDC) system based on a fixed electrode concept replaces the previous design which was based on a movable electrode integrated with the ITER In-Vessel-Viewing-System. Recently the conceptual design of the GDC system was reviewed successfully on the functions, safety, operation and maintenance. The design proposed was checked against the requirements and found to be feasible. This paper gives an overall description of the requirements from physics and operation viewpoints and introduces the design at the conceptual level. Main R&D activities are listed and summarized. Further detailed studies are to be performed in the following design stage.