Thermohydraulic analysis of ITER central solenoid by a quasi-2D model

The central solenoid of ITER is wound from cable-in-conduit-conductors (CICC) with 2 cooling channels separated by an open spring. The mass flow, momentum, and heat transfer are different in the 2 channels, but are coupled through the spaced spring. A quasi-2D model has been used to analyze the thermohydraulic behavior of 2 channel helium flow in the ITER central solenoid. Unlike other thermohydraulic analytical models, the new model is able to implicitly and dynamically compute the mass, momentum and energy exchange between the 2 channels, and therefore to provide a more detailed picture of the thermohydraulic performance of helium flow in 2-channel CICC. In addition, 3D heat coupling between turns as well as electromagnetic coupling between active and passive eddy currents in structures is both modeled. Results are presented for pulsed field operation during a typical ITER plasma cycle.