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Open research questions in Magnetic confinement fusion research

56 unresolved questions extracted from the limitations and future-work sections of 242 Magnetic confinement fusion research papers in our library. Each links back to the study that raised it.

What the literature leaves open

  • Experimental verification of the results. Investigation of the effects of almost-rational q values on turbulent momentum transport in different tokamak configurations.

    Intrinsic momentum transport driven by almost-rational surfaces in tokamak plasmas · 2026 · DOI

  • The coordinate singularity at magnetic X-points where the poloidal magnetic field vanishes. The need to simulate the core and scrape-off layer simultaneously. The need to improve the accuracy and efficiency of tokamak simulations.

    Constructing field-aligned coordinate systems for gyrokinetic simulations of tokamaks in X-point geometries · 2026 · DOI

  • The complexity of turbulent transport in tokamak plasmas. The need for reduced models to approximate the level of turbulent transport. The discrepancy in the prediction for H in ITG-dominated discharges of higher density.

    Integrated modelling simulations of Ohmic and L-mode JET discharges in H, D and T using JETTO-TGLF · 2026 · DOI

  • The study is limited to simulations and does not include experimental validation. The framework assumes a two-dimensional axi-symmetric configuration and neglects scattering.

    Impact of non-equilibrium radiation in a high-enthalpy inductively coupled plasma wind tunnel · 2026 · DOI

  • The impact of non-equilibrium radiation on plasma dynamics in ICP facilities is poorly quantified. Prior work has commonly neglected or simplified radiative heat transfer in ICP facilities.

    Impact of non-equilibrium radiation in a high-enthalpy inductively coupled plasma wind tunnel · 2026 · DOI

  • The typical constraint of weak intrinsic rotation in tokamaks. The lack of a mechanism for strong intrinsic rotation in tokamaks.

    Intrinsic momentum transport driven by almost-rational surfaces in tokamak plasmas · 2026 · DOI

  • Finally, we will discuss open questions and improvements to our present modelling capabilities required to extrapolate the results to power plant devices.

    Development of a high-current, high fusion performance scenario on JET: physics insights and operational challenges · 2026 · DOI

  • Pure Ne seeding leads to a narrow operational window constrained by core impurity accumulation and H-mode to L-mode back transitions, while pure solid B injection (SBI) is insufficient for effective divertor cooling.

    Simultaneous ELM suppression and divertor detachment via synergistic boron powder and neon injection in EAST · 2026 · DOI

  • The study notes the challenges of operating in a harsh radiation environment. The study mentions the limitations of using a short-wavelength laser. The study discusses the need for shielding against neutron and γ-ray irradiation.

    CO2-laser Interferometer on the Large Helical Device · 2026 · DOI

  • The study suggests future research on the development of CO2 laser interferometers for electron density measurements. The study recommends further study on the operation of the interferometers in harsh radiation environments. The study proposes the application of the interferometers to future fusion reactors.

    CO2-laser Interferometer on the Large Helical Device · 2026 · DOI

  • The inhomogeneous and compressible nature of the Eulerian drift fields. The lack of understanding of the stationarity, ergodicity, and time-symmetry of test-particle dynamics. The development of accurate models of plasma behavior.

    Lagrangian features of turbulent transport in tokamak plasmas: the Cyclone Base Case · 2026 · DOI

  • The study is limited to the Cyclone Base Case. The simulations assume a specific initial distribution of particles. The study does not consider other physical regimes.

    Lagrangian features of turbulent transport in tokamak plasmas: the Cyclone Base Case · 2026 · DOI

  • Heat conduction in weakly collisional, magnetised plasma is challenging to model accurately. Experimental constraints are needed to improve understanding of thermal transport.

    Design of experiments characterising heat conduction in magnetised, weakly collisional plasma · 2026 · DOI

  • Applying TGLF-WINN to higher-fidelity gyrokinetic simulations. Exploring the use of TGLF-WINN in other applications, such as flux-matching problems in tokamak design workflows.

    TGLF-WINN: Data-efficient deep learning surrogate for turbulent transport modeling in fusion · 2026 · DOI

  • The need for a data-efficient neural surrogate for turbulent transport modeling. The limitations of existing models in handling sparse and noisy datasets.

    TGLF-WINN: Data-efficient deep learning surrogate for turbulent transport modeling in fusion · 2026 · DOI

  • Future research should focus on addressing the limitations identified in the study. Thermal management and low-thrust trajectory integration should be prioritized. Reconnection valve controllability and structure-pulse coupling should be investigated.

    磁拉瓦尔喷管推进器 V5.0:能量自洽闭环与物理标定 · 2026 · DOI

  • The study identifies a gap in energy self-consistency closure for the MLN thruster. Prior work has focused on momentum-only models, neglecting energy sources. The gap is addressed by deriving a thrust formula from energy conservation and momentum theory.

    磁拉瓦尔喷管推进器 V5.0:能量自洽闭环与物理标定 · 2026 · DOI

  • Abstract Transient broadening of the SOL density profile can modify main-chamber first-wall particle fluxes and divertor loading, yet its control parameters remain debated between divertor-regime transitions, neutral dynamics and changes in cross-field transport.

    Post-puff SOL broadening on MAST-U under high-recycling conditions: evidence consistent with cross-field transport changes · 2026 · DOI

  • Future research should focus on improving the understanding of the EGAM frequency transition. The development of new devices and the improvement of existing devices require a better understanding of energetic particle driven instabilities.

    Simulation of Energetic Particle Driven Instabilities · 2026 · DOI

  • There is a need for better understanding of the EGAM frequency transition. Previous research has made significant progress, but there are still gaps in our understanding.

    Simulation of Energetic Particle Driven Instabilities · 2026 · DOI

  • The QITE Core SDK itself remains proprietary. The paper does not discuss the scalability of the QITE policy to larger plasma control problems.

    Quantum-Inspired Thermal Equilibrium: Integration of Collective Dynamics into Real-Time Stabilization of Magnetically Confined Fusion Plasmas — Extended Edition with External Validation on the Gym-TORAX Reinforcement-Learning Environment · 2026 · DOI

  • To further develop the QITE policy and evaluate its potential for larger plasma control problems. To apply the QITE policy to other complex control problems. To investigate the scalability and robustness of the QITE policy.

    Quantum-Inspired Thermal Equilibrium: Integration of Collective Dynamics into Real-Time Stabilization of Magnetically Confined Fusion Plasmas — Extended Edition with External Validation on the Gym-TORAX Reinforcement-Learning Environment · 2026 · DOI

  • The extensive integrated modelling provides confidence in ARC performance approaching 1 GW, while nonlinear gyrokinetic modelling results in open questions into the physics of density and temperature peaking in fusion-power-plant-relevant operational space.

    Performance and transport in the ARC tokamak · 2026 · DOI

  • Dedicated publications on plasma disruptivity and disruption prediction and avoidance are planned. The paper suggests that experience with unmitigated disruption impacts in SPARC will better define what rare means.

    ARC disruption physics and strategy · 2026 · DOI

  • The coordinate singularity at magnetic X-points where the poloidal magnetic field vanishes is a major challenge for field-aligned coordinate systems. Many tokamak simulation codes struggle with this issue.

    Constructing field-aligned coordinate systems for gyrokinetic simulations of tokamaks in X-point geometries · 2026 · DOI

Most-cited papers in Magnetic confinement fusion research

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56 open questions have been extracted from the limitations and future-work passages of 242 Magnetic confinement fusion research papers in our library. Each one below links back to the study that raised it, so you can read the original claim in context.

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