An anode assembly includes a rotatable hub having a rotation axis and having a cooling passage formed therethrough and a ferrofluid seal attached to the rotatable hub, the ferrofluid seal fluidically separating a first volume containing the target from a second volume. A target is attached to the rotatable hub, the target having a rotation axis coincident with the rotation axis of the rotatable hub and having a chamber formed therein fluidically coupled to the cooling passage, the target having a focal track material attached to an outer face of the target.