At energy frontier machines such as a 100TeV collider, top quarks as energetic as O(10's TeV) become available and these highly boosted tops look more similar to QCD-jets. Top-tagging at such high energies involves several new issues in terms of both physics and detector capabilities. In this talk, we will explore these issues with several detector models (that we propose) in the context of the JHU top tagger and N-subjettiness.
