English: Most target diagnostic instruments at the National Ignition Facility (NIF) will operate inside large vacuum-sealed diagnostic instrument manipulator tubes called DIMs. The instrument is loaded into the DIM and inserted in the target chamber through a gate valve after air is evacuated from the tube. In the photo, Joel Alfonso adjusts a DIM handling unit, a canister used to transport diagnostic instruments and load them into the DIM. NIF is located at Lawrence Livermore National Laboratory in northern California.