Posted on: 8th April 2011

In Week 73 we described some of the work that would take place at Octant 8 to reinstate the systems. These had been dismantled to upgrade the neutral beam ducts. As this week’s photo shows, this work is now essentially complete.

The pipe which runs from left to right is an evacuated beamline for a diagnostic (known as KX1) which studies X-rays from the plasma. The grey cylinder around the pipe to the right of the photo is the collimator. Inside its stainless steel shell there are layers of lead and polythene. The combination of these two materials is effective at slowing down neutrons and absorbing them.

As you can see – diagnostic systems on the scale required for JET involve a combination of physics and heavy mechanical engineering.