  The KATRIN (Karlsruhe Tritium Neutrino) experiment investigates the energetic
endpoint of the tritium beta-decay spectrum to determine the effective mass of
the electron anti-neutrino. The collaboration has reported a first mass
measurement result at this TAUP-2019 conference. The TRISTAN project aims at
detecting a keV-sterile neutrino signature by measuring the entire tritium
beta-decay spectrum with an upgraded KATRIN system. One of the greatest
challenges is to handle the high signal rates generated by the strong activity
of the KATRIN tritium source while maintaining a good energy resolution.
Therefore, a novel multi-pixel silicon drift detector and read-out system are
being designed to handle rates of about 100 Mcps with an energy resolution
better than 300 eV (FWHM). This report presents succinctly the KATRIN
experiment, the TRISTAN project, then the results of the first 7-pixels
prototype measurement campaign and finally describes the construction of the
first TRISTAN module composed of 166 SDD-pixels as well as its implementation
in KATRIN experiment.
