News & events
Plasma heating puzzle comes together | 27/10/2015
The complex puzzle that makes up MAST Upgrade's main plasma heating system is well on the way to completion.
The neutral beam injection (NBI) system will provide most of the heating power for MAST Upgrade (around 5 megawatts). It works by firing fast-moving neutral particles into the plasma, where their motion is transferred into heat.
Recent work has focused on the NBI bend magnets and ion dump assemblies. These components steer stray charged particles away from the heating beam and absorb their energy, which can be as much as 12 megawatts per square metre – much more than the loads on spacecraft re-entering the atmosphere.
The bend magnets were delivered to site during the summer and passed acceptance testing before undergoing a trial fit in the NBI tanks to check their alignment. Meanwhile, the build of the welded ion dump assemblies has proceeded well throughout the year.
By the end of 2015, the pre-assembly of these components will be complete, leaving them ready for installation into the NBI tanks and the re-build of the NBI system to be started next year, a process that will be finished during 2016.
CCFE's Sanjay Mistry (pictured) and Fahim Dhalla have supervised the work, which involved in-house teams from Culham's Engineering Installation Group, Welding Section and Special Techniques Group, as well as contractors Tesla and PVA from the UK and Germany respectively.
Sanjay tells us: “The intricate detail involved in producing these complex items of engineering has been quite a challenge. A lot of creative thinking and problem-solving has gone into the project and it's gratifying to see all the pieces starting to fit together.”