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The ultra-violet (UV) high-resolution spectropolarimeter Pollux is beingstudied in Europe under CNES leadership for the LUVOIR space mission. LUVOIR isa projected 15-m telescope equipped with a suite of instruments proposed toNASA. Pollux will perform spectropolarimetric measurements from 90 to 400 nmwith a resolution of 120000. The spectrograph will be divided in threechannels, each with its own polarimeter: far UV (FUV, 90-124.5 nm), mid UV(MUV, 118.5-195 nm), and near UV (NUV, 190-390 nm). We present here our FUVprototype and our investigation to optimize this polarimeter (angle, materials,coating...).

A far Ultra-Violet Polarimeter by reflection for Pollux on board LUVOIR