The control of tritium in present and future fusion plants isimportant for the viability of fusion as a power source. This studypresents a generic model which describes the thermal and closed loopcontrol behaviour of cold trap assemblies. The model can also be appliedto any gas' separation or purification in chemical processing,archeometry sample processing and industrial process applications,typically in the range of 80-200 K. It applies to any trap configurationand is used to simulate the dynamic behaviour, the thermal and masstransfer processes and the control parameters in order to optimiseperformance. In the special case of hydrogen isotope separation,including tritium, as in fusion applications, the model is used to gainan in-depth knowledge of the packed bed control system and operationunder tritium gas, and minimise any unnecessary testing and stressing ofthe cold trap
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