Pre-Launch

After integration, the payload is moved to White Sands Missile Range, NM, for launch preparations.

On base, the science payload is re-integrated with the NSROC sections and the rocket as a whole is once again tested and assessed. As part of the preparations, all of the springs and explosive devices used during flight (to jettison the nose cone, sever the de-spin weight cables, etc) are also installed and readied. If everything looks good, the launch procedure is simulated multiple times in intensive tests where each team member plays the exact role that they would play on launch night. All commands sent to the rocket and all timed internal events are checked to make sure they are received or activated correctly. The idea is to test all the systems and undertake the launch process so many times that it feels routine, so that on launch night everything goes smoothly.

Once the payload is deemed ready for launch, it's moved out to the launch pad and installed on the launch rail. All the 'ground' umbilical cables supplying power and data are connected, and the science payload is surrounded by a styrofoam box to insulate it from any temperature swings that would affect its optical alignment. The rocket motors are brought out to the rail and attached to the payload. During this whole process, which occurs over multiple days, a turbopump/rough pump combination remains at the rail, keeping the science payload at high vacuum. A shed structure protects the payload from rain, lightning, and the elements.

On launch night, the shelter is rolled away, the pump is removed, the rocket motors are armed, and the payload is raised to vertical. Two more simulated launches occur, followed by a third launch procedure-- except this one's the real thing. At the end of the final 'hot' count, it's launch time.

See below for pictures of the pre-launch preparations and procedures.