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One of the most highly anticipated of these upgrades will be the continued installation and initial on-Sun site testing of the single-etalon version of the Visible Tunable Filter (VTF) instrument, an in-kind contribution from the Institute for Solar Physics (KIS) in Freiburg, Germany. The second etalon for the VTF is currently being assembled at KIS and is expected to arrive mid-2025. Science verification and commissioning of the dual-etalon VTF is expected to begin late 2025 and will continue throughout 2026. Following the extended engineering campaign, DKIST will begin Cycle 3 science observations.
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