Transition Edge Sensor Chip Design of Modular CE{\nu}NS Detector for the Ricochet Experiment

Coherent elastic neutrino-nucleus scattering (CE$\nu$ NS) offers a valuable approach in searching for physics beyond the Standard Model. The Ricochet neutrino experiment aims to perform a precision measurement of the CE$\nu$ NS spectrum at the ILL nuclear reactor with cryogenic solid-state detectors. The experiment employs an array of cryogenic thermal detectors, each with a mass of around 30~g and an energy threshold of 50~eV. The US groups will contribute a 9 detector array based on Transition Edge Sensors (TES) read out with microwave SQUID multiplexers. The design will not only fulfill the requirements for Ricochet, but also act as a demonstrator for future neutrino experiments that will require thousands of macroscopic detectors and readout channels. In this article, we will present our second design of our modular TES chip and discuss the predictions from our numerical modeling.