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The full LINC-NIRVANA instrument will be one of the most complex ground-basedastronomical systems ever built. It will consist of multiple subsystems,including two multi-conjugate ground layer AO systems (MCAO) that drive the LBTadaptive secondaries, two mid-high layer AO systems with their own Xynetics 349actuator DM's , a fringe tracker, a beam combiner, and the NIR science camera.In order to mitigate risk, we take a modular approach to instrument testing andcommissioning by decoupling these subsystems individually. The first subsystemtested on-sky will be one of the ground-layer AO systems, part of a test-bedknown as the Pathfinder. The Pathfinder consists of a 12-star pyramid wavefrontsensor (PWFS) that drives one of the LBT's adaptive secondaries, a supportstructure known as "The Foot," and the infrared test camera (IRTC), which isused for acquisition and alignment. The 12 natural guide stars are acquired bymoveable arms called "star enlargers," each of which contains its own opticalpath. The Pathfinder was shipped from MPIA in Heidelberg, Germany to the LBTmountain lab on Mt. Graham, Arizona in February 2013. The system was unpacked,assembled in the LBT clean room, and internally optically aligned. We presentthe results of our system tests, including star enlarger alignment and systemalignment. We also present our immediate plans for on-sky closed loop tests onthe LBT scheduled for late Fall. Because plans for all ELTs call for groundlayer correction, the Pathfinder provides valuable preliminary information notonly for the full LINC-NIRVANA system, but also for future advanced MCAOsystems.

Laboratory Results and Status Update for Pathfinder at LBT, The LINC-NIRVANA NGS Ground- Layer AO Subsystem