"Turbine" noble-liquid endcap calorimeter for the Future Circular Collider

The physics program at the electron-positron Future Circular Collider (FCCee) will place unprecedented demands on the precision and stability of detectors. Among potential calorimeter technolgies, noble-liquid based devices stand out due to their exceptional linearity and resistance to aging effects. We report on a design for a noble-liquid electormagnetic calorimater for the endcap region of an FCCee detector. The design incorporates a novel "turbine-like" arrangement of the absorbers and electrodes, allowing excellent energy resolution, high granularity, uniformity in phi, minimization of upstream material, and the abilty to be constructed from only a small number of absorber and electrode designs. This work has been done in the context of the ALLEGRO FCCee detector concept. Mechanical considerations, initial results from tests of a prototype electrode, and the expected performance of the calorimeter based on detailed simiulations will be presented.