MITHRANDIR- A 2-CHANNEL MODEL FOR THERMAL-HYDRAULIC ANALYSIS OF CABLE-IN-CONDUIT SUPERCONDUCTORS COOLED WITH HELIUM-I OR HELIUM-II( )

Mithrandir(1) - a 1-D code for the analysis of thermal-hydraulic trans ients in cable-in-conduit super-conductors (CICC) with cooling channel - has been extended to helium II by including Gorter-Mellink heat tra nsport. The code treats the general case of different thermodynamic pr operties and flow velocities for the helium in the cable bundle region and that in the cooling channel, which are coupled to conductor and j acket at different temperatures. A detailed validation of the code aga inst a thermal-hydraulic experiment in helium II is presented, showing good agreement, and code convergence is demonstrated numerically. We present results of simulations of the QUench Initiation and Propagatio n Study (QUIPS) experiment, concentrating mostly on the initial phase of the quench. We show that the simulation is at least qualitatively i n agreement with experimental data. (C) 1998 Elsevier Science Ltd. All rights reserved.