Proposal of High Efficient Discharge Cleaning Using Local Island Divertor in LHD

A new method of high efficient discharge cleaning using Local Island Divertor(LID) in the Large Helical Device(LHD) project is proposed as one of optional merits of LID. This method drastically shortens the discharge cleaning time required in wall conditioning to remove main impurities such as oxygen on the surface of plasma facing components. The first estimation concludes very fast conditioning in less than one hour even in a large machine like LHD, which usually needs more than a few weeks with conventional discharge cleaning methods. Demonstration in actual plasma devices is proposed.