Conceptual Design of Magnetically-Guided Liquid Metal Divertor on QUEST

An innovative concept of heat and particle removal from the divertor was proposed. This scheme takes full advantage of liquid metal convection, in addition to conduction, to remove heat from the divertor, which is the most difficult issue of fusion reactor design. We propose that liquid metal (LM) should replace the solid divertor plates on the bottom of the vacuum vessel. The LM is continuously supplied from openings located at the outer separatrix hit points on the floor of the LM casing on the bottom of the vacuum vessel, and exhausted from openings located at the inner separatrix hit points on the floor of the LM casing. A conceptual design report has been proposed for the QUEST device in RIAM of Kyushu University. Implementation of this divertor could make a significant contribution to the mission of the QUEST project, i.e. exploration of long pulse operation regime and development of the scientific basis thereof and pave a way toward a reactor-relevant divertor concept.Plasma Conference 201