Getter support structure for a solar thermal power plant

A pipe in a solar thermal power plant, the pipe comprising:

• an inner tube configured for carrying a heated heat transfer fluid;
• an outer tube surrounding the inner tube, wherein a space between the inner and outer tube is evacuated;
• and
• a getter restraint structure configured for maintaining a plurality of getters in a predetermined position, wherein the getter restraint structure is in contact with the outer tube and otherwise entirely free of contact with the inner tube such that there is no solid connection between the getter restraint structure and the inner tube as well as no intervening connection therebetween,
• wherein the getter restraint structure is in thermal isolation from the inner tube;
• and
• wherein the getter restraint structure comprises:
• a storage portion configured for containing therein the plurality of getters in fluid communication with the space between the inner and outer tube, and
• a biasing member configured to bias the storage portion against an inner surface of the outer tube;
• and
• a connecting member attached to the biasing member for connecting the biasing member to the storage portion,
• wherein the connecting member and the storage portion are centered at a midpoint of the biasing member.