Numerical analysis of heat-induced transients in forced flow helium cooling systems

This work investigates theoretically the consequences of a space and time dependent energy input into the cooling system of a forced flow cooled superconducting magnet. Based on a proved computer code for calculation of instationary fluid flows, a new program was developed which is able quantitatively to calculate pressure and temperature transients caused by heat pulses. The program was checked by comparing the results with those of a simulation experiment. A further test was made by comparison with stationary flow results calculated from a well know program. In combination with computer programs, which are able to calculate the quench propagation in a current loaded superconductor, the numerical procedure allows for the investigation of the influence of transient helium flow processes on the stability of the superconductor. Our program is proposed as a good tool for the design of forced flow cooling systems of large superconducting magnets.