SPEKTRE, a linear radiofrequency device for investigating edge plasma physics
Résumé
SPEKTRE (Sheaths, Plasma Edge & Kinetic Turbulence Radiofrequency Experiment) is a research platform in plasma physics and nuclear fusion, currently under construction in Nancy. SPEKTRE is the result of a cooperation within a research agreement between the University of Lorraine and the IPP Garching. It will produce a plasma 40 cm in diameter and 6 m long, under a maximum magnetic field of 0.5 Tesla generated by 13 large flat coils of the former W7-AS stellarator. SPEKTRE can be seen as a step beyond the IShTAR device [1], of which it integrates several components such as the helicon source chamber. SPEKTRE aims at studying the physics of RF sheaths and ICRF heating thanks to an antenna currently being designed that will be coupled to a 100 kW RF generator. Such long plasma column will also allow to study the physics of instabilities and turbulent transport, in particular of impurities, and to conduct targeted studies on plasma-wall interactions. SPEKTRE aims at being widely open to the whole plasma physics community. Finally, the device will host a liquid metal test bench in the framework of a collaboration with the company Renaissance Fusion, in order to study the interactions between plasma and a flowing lithium wall, in conditions similar to those of fusion edge plasmas.
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