A variety of options can be used to attach to the tube/conductor depending on whether or not the joint or required components will couple with the RF field. CeramTec can make no general recommendation because of the large variety of systems and applications in various industries. Testing is recommended. Options include: vacuum brazing, soldering, compression fittings, and welding. CeramTec can offer designs with a short copper rod welded on the vacuum or air side of a tube to serve as a plug for those who do not need or want coolant fluid and want to attach with a clamp. CeramTec can also braze entire coils in a feedthrough and offer non-coil designs with return coolant paths.