Pellet injector prototype. Photo: US ITER/ORNL View full media

A view of the different barrels of the shattered pellet injection prototype. Photo: US ITER View full media

Guide tube selector test unit prototype guides pellets to specific locations in the plasma. Photo: US ITER/ORNL View full media

A tritium-compatible pump is part of a test stand used to assess pumping speed and pump reliability. ITER. Photo: US ITER/ORNL View full media

3 barrel shattered pellet injector prototype installed in an open vacuum box in the pellet lab at ORNL. Photo: US ITER/ORNL View full media

Pellet injection guide tube selector test unit. Photo: US ITER/ORNL View full media

A view of the different barrels of the shattered pellet injection prototype. Photo: US ITER View full media

An early twin-screw extruder prototype for fueling. Photo: US ITER/ORNL View full media

Close-up view of the twin-screw extruder nozzle prototype. Photo: US ITER/ORNL View full media

Pellet injection dual nozzle extruder. Photo: US ITER/ORNL View full media

Shattered pellet injection component installed in a test stand at ORNL. Photo: US ITER/ORNL View full media

Internal view of a pellet guide tube selector test unit. Photo: US ITER/ORNL View full media