Olivier Vacus

Intelligence Summary: Olivier Vacus

Node Identity
Olivier Vacus serves as Scientific Director of CEA/DAM and is the current French co-chair of the US-France Stockpile Stewardship Agreement Steering Committee. In this dual capacity, Vacus holds both the top scientific leadership role within France's military nuclear weapons program and the primary French institutional responsibility for managing the 20+ year collaboration framework with US weapons laboratories (LLNL, LANL, SNL).

Strategic Relevance
Vacus's significance is substantial: as CEA/DAM Scientific Director, he oversees the scientific direction of France's entire nuclear weapons simulation enterprise — including LMJ experiments, TROLL code development, TGCC supercomputing operations, and the EPURE hydrodynamic program. His role as co-chair of the US-France agreement Steering Committee places him at the nexus of Franco-American nuclear weapons physics collaboration, with annual Steering Committee meetings and biennial General Meetings alternating between US and French sites. The agreement he co-chairs enables approximately 125 collaboration proposals with 20-30 active projects covering Materials in Extreme Conditions, Nuclear Physics, and Atomic and Plasma Physics. Vacus's position means he directly influences which collaborative research projects are prioritized, how French and US weapons lab expertise is shared, and how the collaboration enhances the physics base of nuclear weapons computer codes essential to both nations' stockpile stewardship missions. His co-chair partnership with NNSA's Njema Frazier represents the current generation of leadership maintaining the institutional framework established by Delpuech and Gordon in 2002 and initiated by Bouchard's sending of Gogny to LLNL in 1998.

Technical Focus / Capabilities
As CEA/DAM Scientific Director, Vacus oversees research spanning nuclear warhead physics design, ICF experimental programs at LMJ, radiation-hydrodynamics code development (TROLL 3D), high-energy-density physics, and computational certification of warhead reliability. The Steering Committee he co-chairs meets annually to review collaboration progress, approve new projects, and set strategic priorities. The General Meetings bring together scientists from CEA/DAM, LLNL, LANL, and SNL for technical exchanges on plasma physics, materials science, and nuclear physics. Vacus's scientific expertise and institutional authority make him the key French decision-maker for collaborative plasma physics research with the United States.

Network Linkage
Vacus co-chairs the US-France Stockpile Stewardship Agreement Steering Committee with Njema Frazier (NNSA). As CEA/DAM Scientific Director, he oversees LMJ, TROLL code, TGCC, EPURE, and the France Simulation Program. The agreement he manages connects CEA/DAM to LLNL (coordinator: Jason Harke), LANL (coordinator: James Colgan), and SNL (coordinator: Thomas Mattsson), with Cyrille De Saint Jean serving as CEA/DAM technical coordinator.