Thanks to its remarkable engineering flexibility, the Joint European Torus (JET) has been providing cutting-edge results in fusion research for more than two decades. That would have been impossible without enhancing JET’s capabilities from time to time. Enhancement means to rely on an excellent scientific and technical team and invest in new state-of-the art equipment. In a machine of JET’s complexity it is unthinkable to run experiments and install new equipment simultaneously. So experiments and enhancements compete for programme time. Shutdown periods cannot be avoided in order to keep JET up to date.
A much less extensive shutdown was performed in 2012/2013. Its main purpose was to remove for analysis some of the tungsten and beryllium tiles installed in the previous shutdown. These specifically marked tiles allow analysis of the deposition and erosion processes that took part in the first experimental campaign with the ITER-Like Wall.
Additionally other systems were maintained (neutral beams, central solenoid) upgraded (diagnostic systems) or calibrated (neutron detection systems).
One of the most extensive refurbishments to JET since its inception was carried out in 2010 – 2011. During this shutdown 86,000 components were installed, to replace the carbon facing components with metallic tiles – beryllium and tungsten – to perform tests for ITER. The installation of the so-called ITER-Like Wall was done mostly with Remote Handling, and, although it cost close to 60 million euros, it has the potential to save hundreds of millions in knowledge gained and efficiencies of operation.
During this highly involved maintenance program a weekly page was provided documenting the tasks: use the link at right to review the Shutdown Weekly.
In 2004/2005 JET ran one of its busiest shutdown periods. Shutdown means to open the machine and undertake maintenance or enhancement works. The main purpose of the refurbishment in 2004/2005 was to extend the plasma performance and diagnostic capabilities of JET to be able to focus on ITER-relevant experimental studies.
This shutdown was particularly challenging for the Remote Handling group, as most of the modifications inside the vessel were carried out by the Remote Handling manipulator. In parallel to the in-vessel operations, new instruments were integrated into JET systems and thorough maintenance was undertaken. Additionally, all new components were rigorously tested according to the JET quality assessment rules. A selection of examples below demonstrates extent and manner of the enhancement done during the shutdown in 2004/2005.