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The present status of operation and upgrades of the 50 keV / 3 A Diagnostic Neutral Beam Injector (DNBI) at TCV tokamak are described. The plasma grid was replaced by a new re-manufactured one with its existing design. The technology and production were performed within SPC-EPFL. The further redesign of the plasma grid was done to improve the strength and stability, accounting for the results of grid deformation measurements, and considering ANSYS thermomechanical analysis in combination with IBSimu beam simulations results. The key parts of the plasma source were re-shaped to increase the DNBI beam pulse duration and the source lifetime. A new power supply set for DNBI was developed after the analysis of a beam current up to 3-3.5 A and extended beam shot duration up to 2-2.5 s. The new multichannel optical diagnostics was recently implemented for the beam spectral measurements.
Patrick Blanchard, Stephan Brunner, Stefano Alberti, Basil Duval, Ambrogio Fasoli, Yves Martin, Olivier Sauter, Laurent Villard, Ivo Furno, Holger Reimerdes, Jean-Philippe Hogge, Stefano Coda