Abstract
The main problem, that has so far risen in the field of thermonuclear fusion, regards the plasma instability and the consequent disruptions that occur afterwards. This leads to pulse interruption and reaction extinguishment. The next generation power plants will therefore require an Electron Cyclotron Heating and Current Drive system (ECH&CD), capable of injecting high power microwave beams where properly needed, in order to destroy magnetic islands and instabilities inside the vacuum vessel. Such a system must be sealed to maintain the vacuum inside the vessel and to act as a barrier for tritium present during pulse operation. A nearly perfect transmission of the microwaves beams used by the ECH&CD system is mandatory: at MW power levels, even the smallest back reflections might severely damage the gyrotrons, which are responsible for the beam
Highlights
The main problem, that has so far risen in the field of thermonuclear fusion, regards the plasma instability and the consequent disruptions that occur afterwards
The most critical diagnostic to be implemented in a diamond window assembly is the arc detection
Arcs may occur in the case of an electrical field build up and their effects are highly destructive for the surroundings. They can lead to the cracking of the diamond windows, 1 Conceptual CATIA model of a diamond window unit, complete with additional diagnostics mock-ups generation
Summary
The main problem, that has so far risen in the field of thermonuclear fusion, regards the plasma instability and the consequent disruptions that occur afterwards. The generation power plants will require an Electron Cyclotron Heating and Current Drive system (ECH&CD), capable of injecting high power microwave beams where properly needed, in order to destroy magnetic islands and instabilities inside the vacuum vessel Such a system must be sealed to maintain the vacuum inside the vessel and to act as a barrier for tritium present during pulse operation. The diagnostics devices to be implemented must have a compact, simple and flexible layout, with a rugged design, in order to maximize serviceability and durability in the harsh surroundings of the windows housing These diagnostics include arc detection, tritium detection, transmitted / reflected microwave power, pressure and the diamond disk temperature. In this paper a first assessment of the various diagnostics to be implemented in a diamond window is given
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