On 7 July 2005, the JET vessel pumpdown concluded a shutdown period that included the installation of more than 20 new systems. This is the most extensive JET Enhancement Programme under EFDA and it will deliver many new scientific results.

The new divertor configuration (see the photograph above) installed on JET is now capable of high-power plasma discharges (up to 40MW for 10s) with strikepoint sweeping and with higher ITER-like triangularity of plasma cross-section (up to δ~0.5). In addition,

many new diagnostic systems will enhance the range of measurements possible in the new experimental campaigns, aiming at further development of the plasma scenarios towards fusion reactor relevant conditions. These include new neutron, temperature, density, fast particle, magnetic and plasma-wall interaction diagnostics.

The Enhancement Programme has been based on an extensive collaboration, with eleven EFDA Associations, several non European laboratories and many hi-tech industries directly involved in the projects. Project leaders and technicians sourced from all over Europe and overseas. The Remote Handling facilities were extensively used during the 2004-2005 JET shutdown completing in total over 200 tasks (including welding) and using more than 500 remote handling tools.

During the 2004-2005 shutdown some important components of the new ITER-like ICRH Antenna were installed, such as the new transmission lines. In parallel, to disengage power sources for the new antenna, 3dB couplers were installed between the transmission lines and the existing antennas. Consequently, power losses due to ELMs should be reduced to give higher averaged power. The installation of the antenna is scheduled to be completed during the 2006 shutdown.

The new systems will be commissioned during the present Restart period. This will be followed by Experimental Campaigns comprising 80 days of operation during the winter of 2005-2006. This programme will focus on bringing the new systems up to full performance, the preparation of ITER operation scenarios, critical physics issues for ITER as well as on other specific physics issues of direct relevance to ITER such as transport and burning plasma physics.