Systems and methods for removing contaminants from the fluid circulation system of a dilution refrigerator

A method for operating a dilution refrigerator having a dilution unit inside a cryostat and a pumping arrangement operable for circulating a fluid mixture through the dilution unit, the method comprising:

• directing the fluid mixture through the dilution unit via a fluid circulation path having a first contaminant filter and a second contaminant filter connected in series and disposed inside the cryostat upstream from the dilution unit;
• removing the first contaminant filter from the fluid circulation path without interrupting operation of the dilution refrigerator;
• performing a cleaning procedure on the first contaminant filter while concurrently directing the fluid mixture in the fluid circulation path through the second contaminant filter;
• and
• reintegrating the first contaminant filter into the fluid circulation path when the cleaning procedure is completed.

A method for cleaning a contaminant filter in a dilution refrigerator having a dilution unit inside a cryostat and a pumping arrangement operable for circulating a fluid mixture through the dilution unit, the method comprising:

• removing, from a fluid circulation path and without interrupting operation of the dilution refrigerator, a first contaminant filter connected in series with a second contaminant filter upstream from the dilution unit;
• performing a cleaning procedure on the first contaminant filter while concurrently directing the fluid mixture in the fluid circulation path through the second contaminant filter;
• and
• reintegrating the first contaminant filter into the fluid circulation path after the cleaning procedure and directing the fluid mixture in the fluid circulation path through the first contaminant filter and the second contaminant filter.