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We present the status of our new experiment to lasercool linear chains of 172Yb+ and 115In+ ions for an optical clock based on the 1S0-3P0 transition in 115In+. We successfully have trapped and laser-cooled Coulomb crystals of 172Yb+ ions in our new scalable ion trap that are used to characterize the trap and to sympathetically cool 115In+ ions. We could demonstrate an area of more than 65 μm, where the fractional frequency shifts due to time dilation are below 10-18 for both ions.
Date of Conference: 21-24 May 2012