Daniel Gogny

Intelligence Summary: Daniel Gogny

Node Identity
Daniel Gogny was a CEA/DAM physicist who was sent to Lawrence Livermore National Laboratory (LLNL) in 1998 by CEA/DAM Director Jacques Bouchard to explore the possibility of scientific collaboration between the French and US nuclear weapons complexes. Gogny's mission to LLNL represents the originating event of what became the formal US-France Stockpile Stewardship Agreement signed in 2002.

Strategic Relevance
Gogny's significance is as the human bridge who initiated the US-France nuclear weapons plasma physics collaboration. His 1998 visit to LLNL was an exploratory mission — assessing the landscape of US weapons lab capabilities, identifying areas of mutual scientific interest, and building the personal and institutional relationships necessary for sustained collaboration. The Gogny mission directly led to a series of bilateral workshops: Nuclear Physics (February 2001), Materials Science (February 2002), and Atomic and Plasma Physics (April 2002), which defined the technical scope of the eventual agreement. The collaboration framework that Gogny's mission initiated has endured for over 20 years, enabling approximately 125 collaboration proposals and 20-30 active projects covering plasma physics, materials in extreme conditions, and nuclear physics. This collaboration directly enhances the physics base of nuclear weapons computer codes (TROLL in France, comparable US codes) used by both nations for stockpile stewardship. Gogny's role demonstrates how individual scientist-level exchanges can seed institutionalized government-to-government cooperation in sensitive nuclear weapons technology.

Technical Focus / Capabilities
As a CEA/DAM physicist, Gogny possessed expertise in nuclear weapons physics relevant to France's Simulation Program. His mission to LLNL would have involved assessing US capabilities in ICF (NIF was under construction), radiation-hydrodynamics simulation, high-energy-density physics, and plasma diagnostics — areas where France was developing indigenous capabilities through LMJ and TROLL code. The Gogny mission's success depended on identifying complementary scientific interests where both French and US weapons programs could benefit from collaboration, particularly in unclassified fundamental plasma physics supporting stockpile stewardship. The workshops that followed his visit defined three collaboration pillars: Materials in Extreme Conditions, Nuclear Physics, and Atomic and Plasma Physics.

Network Linkage
Gogny was sent to LLNL by Jacques Bouchard (CEA/DAM Director) in 1998. His mission initiated the collaboration that became the US-France Stockpile Stewardship Agreement (signed by Alain Delpuech and John Gordon in 2002). The agreement connects CEA/DAM to LLNL, LANL, and SNL, and is currently maintained by co-chairs Olivier Vacus and Njema Frazier with technical coordinators at all four labs.