Abstract: A method of operating an evaporation pump system in a chamber at partial vacuum is provided. The method includes heating a getter source to form a getter vapour; depositing the getter vapour onto a first target surface arranged within the chamber to form a getter layer; and providing a replenished target surface within the chamber, and onto which the getter vapour can be deposited, by at least partially removing, from the first target surface, the getter layer and any chemisorbed, and/or physisorbed products present within the getter layer, said step being carried out within the chamber; and/or arranging a second target surface within the chamber, wherein, the getter source comprises lithium.

Abstract: A cooling management system for a plasma-facing assembly in a magnetic confinement plasma chamber, the cooling management system comprising: a plurality of coolant unit groups, each configured to provide cooling to a respective part of the plasma-facing assembly and being fluidly connected to a coolant source line; and a valve arrangement operable to control a flow rate of coolant from the coolant source line to each of the coolant unit groups dependent on the temperature at that coolant unit group.