Tokamak à Configuration Variable (TCV)

Intelligence Summary: Tokamak à Configuration Variable (TCV)

Node Identity: TCV (Tokamak à Configuration Variable) is a highly flexible medium-scale tokamak operated by the Swiss Plasma Center (SPC) at EPFL in Lausanne. It is a cornerstone of European fusion research, unique in its magnetic shaping capabilities that enable exploration of unconventional plasma configurations including negative triangularity (NT) — a concept that could eliminate ELM instabilities in future reactors. TCV specifications: major radius ~0.9m, aspect ratio ~2.5, toroidal field ~1.4T, full carbon wall. Heating systems include 2.6 MW Neutral Beam Injection (NBI) and 3.5 MW total of X2 and X3 harmonic ECRH, with two additional 1 MW dual-frequency gyrotrons foreseen for 2026-2027.

Strategic Relevance: TCV's strategic relevance to the FRC/plasma weapons landscape is defined by its unique plasma shaping flexibility and its role as a world-leading facility for negative triangularity research. NT configurations could offer an ELM-free reactor path, and TCV is the world's leading facility for this research. The device's ability to explore unconventional plasma configurations — including extreme elongation, varying triangularity, and double-null divertor geometries — makes it irreplaceable for studying reactor-relevant plasma physics. TCV's AI integration, developed in collaboration with prominent players in the field, represents cutting-edge plasma control using model-based and data-driven approaches for real-time equilibrium reconstruction — capabilities with potential dual-use implications for real-time control of plasma systems in weapons contexts. TCV achieved a record 3,517 successful plasma discharges in 2024 and operates as part of the EUROfusion Tokamak Exploitation Work Package (WPTE).

Technical Focus / Capabilities: TCV research areas include: ITER baseline scenarios, pedestal physics, high-βN non-inductive regimes, quasi-continuous exhaust, X-point radiator plasmas, negative triangularity configurations, runaway electron mitigation, and fast-ion loss mechanisms. Following a complete overhaul of neutron/gamma shielding in early 2023, TCV now operates without radiation-imposed limits. The fourth major refurbishment of TCV's flywheel generator ensures operation for the next ten years. The "Swiss Fusion Hub" initiative received CHF 12.5 million in 2024 (part of the 2025-2028 Swiss Roadmap for Research Infrastructures), funding TCV upgrades including enhanced diagnostics, real-time control systems, and a redesigned divertor. AI algorithms are integrated into TCV's control system for plasma magnetic control and real-time equilibrium reconstruction.

Network Linkage: TCV maintains 2 documented connections: EPFL operates TCV and Swiss Plasma Center coordinates TCV. TCV is funded through EUROfusion Switzerland and operates within the EUROfusion WPTE work package. The DIFFER institute (Netherlands) deploys its MANTIS 10-camera multispectral imaging system on TCV for edge plasma diagnostics. Former SPC Director Ambrogio Fasoli became EUROfusion Programme Manager (CEO), ensuring Swiss influence in European fusion governance. Current SPC Director: Prof. Paolo Ricci (succeeded Fasoli July 2024).