It's an amazing place, and the images I'd seen prior to the tour had focused on the vacuum chamber where the plasma is created, and I hadn't grasped the extent of the surrounding equipment. We couldn't go into the hall, but there's a scale model in the visitor area (see the little man for an idea of scale):
|Scale model of JET experiment.
We did get a look around other areas though, which included various pipes, lasers, cabinets of computers, cables. and a massively weighty door...
|Rachel and a Big Door.
The kind of snake out of slots in the wall, and the operator can repair/measure/check/clean the interior of the vacuum chamber without the delay and risk of sending a person in.
At the end of the tour was a series of photos showing the evolution of JET as various upgrades were developed and added:
Interesting how it starts as a fairly ideal geometrical form, becoming more armoured and heavy as the improvements accumulate.
JET is a stepping stone towards the next step in fusion technology, ITER in France, which among other things, is in turn a stepping stone to a demonstration fusion energy power plant.