Ion source specific power limitations connected with cooled electrode deformation

Considered are specific power limitations related to the deformation of water-cooled electrodes in the ion-optical system (IOS) of power ion sources for producing fast atoms and for injecting them into thermonuclear machines. Calculated was dependence of changing focal distance of IOS consisting of electrodes in the form of tube raws arranged in parallel on an initial curvature radius and size of tubes, cooling conditions as well as on the specific power on them. It is established that even tubes loosely gaining in breadth will deform on their inhomogeneous heating from one side. The investigation into the tube deformation shows the necessity for limiting the specific power W on tubes of emission electrode especially in case of a long channel for fast atoms and a small tube diameter. Simultaneously, source ion beam power density is necessary to limit. To create IOS with a large focal distance slightly changing on loading, cooling tubes of large sizes must be used. Increasing accelerating voltage on IOS it is necessary to decrease the source ion beam current density. When increasing the source ion beam power density, IOS electrodes must be cooled with liquid metal