THERMOHYDRAULICS OF CICCS WITH CENTRAL COOLING PASSAGE

The cable-in-conduit conductors for ITER will have a ''central cooling hole'', a low impedance flow channel whose purpose is to decrease the pressure drop per unit length. The helium flow and the response to te mperature transients of such an arrangement has unique features compar ed to those of the simpler CICC's without central cooling hole. The pu rpose of this paper is to discuss these features and to propose a mode l for the description of the compressible thermohydraulics of the ITER conductors. Some typical applications of the model proposed (transien t cooling of a conductor length in a magnet, quench evolution) are als o shown as an example.