SMuK 2023 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 117: Dark Matter I
T 117.1: Vortrag
Donnerstag, 23. März 2023, 15:50–16:05, HSZ/0003
Investigating Dielectric Loss in Travelling Wave Parametric Amplifiers for MADMAX — •Georg Monninger1, Gwenael Le-Gal2, Giulio Cappelli2, Béla Majorovits1, and Nicolas Roch2 for the MADMAX collaboration — 1Max-Planck-Institut für Physik, Munich, Germany — 2Institut Néel, 38000 Grenoble, France
MADMAX is an experiment for the search of dark matter axions. In order to have the required senstivity, preamplifiers are required that operate at or close to the quantum limit. To reach standard quantum limit, a major open challenge is to improve the added noise in TWPA. One of the main phenomena, which could contribute to the noise, is capacitive dielectric loss. Losses become especially large when going to higher frequencies, as we are looking for when probing the axion mass in the range of 40−400 µeV at MADMAX. To investigate their origin, λ/2-Josephson resonators were built to measure tan(δ) via extraction of quality factors. Two geometries were compared. This talk shows the measurement procedure and the obtained results.