This paper details the development of the Adiabatic Demagnetization Refrigerator (ADR) control electronics for X-IFU instrument, of ESA’s newAthena observatory. The ADR operates in a closed loop using a PID system, where the voltage bias is regulated based on the temperature measurements. The core of this work details the design and development of two electronics board prototypes, a differential low noise amplifier and a power supply board, addressing the unique space constraints and operational requirements. The ultra-low noise amplifier is designed to readout a 50mK resistive sensor. We have achieved a noise level of 2nV/√Hz which is critical for addressing the challenges of thermal stability (0.8μK RMS at 50mK), essential to achieve the instrument’s target resolution of 2.5eV. Preliminary results of the ADR cooler’s performance and its control electronics will be presented, emphasizing the temperature regulation achievements during the observation phase.
LiteBIRD is a JAXA strategic L-Class mission designed to search for the existence of primordial gravitational waves produced during the inflationary phase of the Universe. This is achieved through measurements of their imprint on the polarization of the cosmic microwave background (CMB). To fulfill the scientific objectives, observations have to be made over a wide range of frequencies (34 GHz - 448 GHz), which is accomplished by three telescopes: the Low-Frequency Telescope (LFT) led by JAXA and the Middle & High-Frequency Telescopes (MHFT) under European responsibility and led by CNES. To withstand the launch, comply with satellite requirements, and minimize the mass of the mechanical structure, we conducted finite element modeling of the entire MHFT, incorporating both modal and quasi-static load analyses. A nodal thermal study was carried out to evaluate, on the one hand, the static thermal loads of the instruments, and on the other hand the sensitivity of the instruments to sinusoidal disturbances simulating those caused by the ADR cooling system. This paper outlines the methodology employed in designing the mechanical structure of the MHFT, then summarizes the initial results and conclusions drawn from various mechanical and thermal analyses performed on the MHFT.
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