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We present recent sensitivity measurements of the LISA Technology Packageinterferometer with articulated mirrors as test masses, actuated bypiezo-electric transducers. The required longitudinal displacement resolutionof 9 pm/sqrt[Hz] above 3 mHz has been demonstrated with an angular noise thatcorresponds to the expected in on-orbit operation. The excess noisecontribution of this test mass jitter onto the sensitive displacement readoutwas completely subtracted by fitting the angular interferometric data streamsto the longitudinal displacement measurement. Thus, this cross-couplingconstitutes no limitation to the required performance of the LISA TechnologyPackage interferometry.

Subtraction of test mass angular noise in the LISA Technology Package interferometer