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At CERN, Marin designed and built the radiation monitor for the silicon tracker of the L3 experiment on LEP. In 1991, he proposed and developed a muon system concept for the Superconducting Super Collider that was virtually identical to the one later chosen for the ATLAS experiment. Marin was a long-term member of the ATLAS Muon Collaboration, and helped construct and install 81 end-cap muon chambers.