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The wavelength shifting reflectors are a key component of the liquid argon veto of the new LEGEND-200 experiment.
They will increase its background vetoing efficiency by both wavelength shifting VUV light into the visible region and by reflecting visible light. Our LEGEND team participated in the development of these reflectors as well as its evaporation with the wavelength shifting (blue-emitting) compound TPB. The entire hardware for moving the evaporator in vacuum for several meters inside the cryostat was developed at UZH by our LEGEND team along with the electronics and mechanical workshop. The hardware assembly and evaporation was undertaken underground at the Gran Sasso Laboratory at the end of 2020 and the reflectors were successfully coated in situ with vacuum evaporated TPB.
