Pick-up horn for high power thermal vacuum testing of spacecraft payloads

A pick-up horn for absorbing radiation emitted by an antenna, the pick-up horn comprising:

• at least one outer metal wall forming a metal body;
• a plurality of interior surfaces disposed in the metal body and forming a plurality of chambers in the metal body;
• a front metal surface disposed at a front end of the metal body, and having a plurality of openings corresponding to the plurality of chambers;
• a plurality of ceramic high-power absorbing loads, each high-power absorbing load disposed within a corresponding one of the plurality of chambers and in contact with at least one of the plurality of interior surfaces;
• and
• a serpentine coolant path disposed within the metal body between an outer surface of the at least one outer metal wall and the plurality of ceramic high-power absorbing loads, the coolant path including a coolant inlet and a coolant outlet, each of which is disposed on the outer surface of the at least one outer metal wall.