Speaker
Description
The dimensioning of cryogenic safety relief devices requires detailed knowledge on the process dynamics following the quench of superconducting magnets or the break of the insulating vacuum. In established standards and design codes, the sizing of cryogenic safety relief devices is based on constant (maximum) heat flux data, which potentially leads to oversized safety relief devices. Beside the implications on cost, space and helium leakage, oversized safety valves often lead to unstable operation during discharge with reduced relief flow capacity due to chattering and pumping. Dynamic models improve the understanding of dependences and design parameters for such devices.
This talk discusses a differential equation model for all time-dependent sub-processes in the case of a breaking insulating vacuum, and compares the results to experimental data from the test facility PICARD.
