1. Fusion Research Infrastructure
This chapter examines Switzerland's fusion research infrastructure, which constitutes the country's plasma physics ecosystem. The analysis draws upon the network graph of 6 entities and 5 relationships, focusing on the Swiss Plasma Center at EPFL and its TCV tokamak facility.
Switzerland's fusion research infrastructure is notable for its focus on a single, highly specialized tokamak device — TCV (Tokamak a Configuration Variable) — that is uniquely designed to study the effects of plasma shape and cross-section geometry on confinement and stability. This specialization gives Switzerland a distinctive position in the European fusion research landscape, providing data on plasma configuration effects that no other device can produce.
1.1 EPFL: Ecole Polytechnique Federale de Lausanne
EPFL (Ecole Polytechnique Federale de Lausanne, est. 1853 as Ecole speciale de Lausanne, reorganized as EPFL in 1969) is one of Switzerland's two federal institutes of technology (alongside ETH Zurich) and is among the world's leading technical universities. EPFL's School of Basic Sciences hosts the Swiss Plasma Center, which serves as the national focal point for Swiss fusion research.
Key relationships:
- Hosts the Swiss Plasma Center
- Participates in EUROfusion Switzerland framework
EPFL's fusion research activities are concentrated in the Swiss Plasma Center but extend to other departments including materials science, electrical engineering, and computational science. The university provides the academic infrastructure, graduate programs, and research funding environment that supports Switzerland's fusion research program. EPFL also maintains strong collaborations with other European fusion laboratories through EUROfusion and bilateral agreements.
1.2 Swiss Plasma Center: CRPP
The Swiss Plasma Center (SPC, formerly Centre de Recherches en Physique des Plasmas / CRPP) is EPFL's plasma physics research center and Switzerland's primary fusion research institution. The SPC was reorganized and renamed from CRPP to Swiss Plasma Center in 2015 to reflect its expanded mission and national role in coordinating Swiss fusion research. The center is located on the EPFL campus in Lausanne and operates the TCV tokamak as its flagship experimental facility.
Key relationships:
- Hosted by EPFL
- Operates the TCV tokamak
- Coordinates EUROfusion Switzerland activities
The Swiss Plasma Center's research portfolio encompasses:
- Tokamak physics: TCV experiments on plasma shape effects, edge plasma physics, scrape-off layer transport, and MHD stability.
- Plasma heating: The SPC develops electron cyclotron resonance heating (ECRH) systems for TCV and contributes to ECRH development for ITER and other devices.
- Plasma diagnostics: The center develops advanced diagnostics including Thomson scattering, infrared thermography, and soft X-ray detection systems.
- Theory and modeling: SPC researchers conduct theoretical and computational plasma physics research, including turbulence simulations, MHD modeling, and transport code development.
- Fusion technology: The center contributes to fusion technology development including superconducting magnets, heating systems, and plasma-facing components.
- Basic plasma science: The SPC maintains research programs in fundamental plasma physics beyond fusion, including dusty plasmas and low-temperature plasmas.
1.3 TCV: Tokamak a Configuration Variable
TCV (Tokamak a Configuration Variable, operational since 1992) is a medium-size tokamak specifically designed to study the effects of plasma shape on confinement and stability. TCV's defining feature is its highly flexible poloidal field coil system, which allows the creation of a wide variety of plasma cross-sections — including elongated plasmas, triangular plasmas, D-shaped plasmas, and negative triangularity configurations. This configurational flexibility is unique among the world's tokamaks and makes TCV an irreplaceable facility for studying plasma shape effects.
Key relationships:
- Operated by Swiss Plasma Center, EPFL (since 1992)
- Contributes to EUROfusion Switzerland research program
TCV's technical parameters include:
- Major radius: R = 0.88 m
- Minor radius: a = 0.25 m
- Plasma current: Up to 1.2 MA
- Toroidal field: Up to 1.43 T
- Heating: Electron cyclotron resonance heating (ECRH) up to 4.5 MW, with additional neutral beam heating added in recent upgrades
TCV's research program focuses on several key areas:
- Plasma shape effects: TCV systematically studies how plasma elongation, triangularity, and squareness affect confinement, stability, and transport — data critical for optimizing tokamak reactor designs.
- Negative triangularity: TCV is one of the few devices capable of studying negative triangularity configurations, which have shown promising confinement and stability properties in recent experiments.
- Edge plasma physics: The device studies scrape-off layer transport, plasma-wall interaction, and edge localized mode (ELM) behavior under various plasma shapes.
- ECRH physics: TCV's powerful ECRH system enables studies of electron heating, current drive, and MHD mode stabilization using electron cyclotron waves.
- H-mode access: TCV studies the transition from low-confinement mode (L-mode) to high-confinement mode (H-mode) under various plasma configurations, contributing to understanding of the L-H transition physics.
TCV's unique configurational flexibility makes it a valuable complementary facility to larger European tokamaks such as ASDEX Upgrade (Germany) and JET (UK). While TCV is smaller and operates at lower parameters than these devices, its ability to vary plasma shape systematically provides data that no other facility can produce.
1.4 Strategic Context
Switzerland's fusion research program operates within the European fusion research framework, with the Swiss Plasma Center serving as the national coordinator for EUROfusion activities. Switzerland's fusion research budget, while smaller than those of Germany, France, and Italy, supports a focused and scientifically productive tokamak research program centered on TCV's unique capabilities.
Switzerland's fusion research strategy is characterized by specialization in plasma shape physics — an area where TCV's unique configurational flexibility gives the country outsized scientific influence. Rather than attempting to maintain a broad fusion research portfolio, Switzerland has concentrated its resources on a single facility with unique capabilities, maximizing the scientific return on its investment.
In the broader context of the 90-round research investigation that informs this paper series, Switzerland represents a modest but distinctive civilian fusion research node. The country's TCV tokamak contributes unique data on plasma shape effects to the global fusion knowledge base, but there is no evidence of any weapons application of this research. Switzerland's fusion program is fully integrated into the European civilian research framework and operates under IAEA transparency.