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2. SUBJECT FIELDS FOR JOINT RESEARCH

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  • Announcement for Joint Research Proposals, 2025
  • 2. Subject Fields for Joint Research

2-3. Nuclear Fusion Dynamics

( 1 ) Designated Joint Research

Designated Joint Research 2 and 3 are related to the field of Nuclear Fusion Dynamics.

( 2 ) International Joint Research

1 ) Collaborative research on tokamak plasma experiments

Advanced Fusion Research Center (AFRC) started operation of QUEST spherical tokamak in 2008. Steady state tokamak operation (SSTO) will be required in fusion power plants. Additionally, important scientific subjects are being pursued in the field of Plasma Wall Interaction (PWI). In particular, “wall pumping and release”, “co-deposition of the fueled particles” and “redeposited wall materials” are key issues to control the fusion power in steady state. Following the expertise acquired through the SSTO project, the QUEST project has been proposed to demonstrate steady state of the spherical tokamak (ST) plasma by radio frequency (RF) waves, and to investigate the controllability of particles under the high temperature wall that is relevant to the future reactor condition. Toward the start of ITER project, the RF technology and in-situ diagnostics of the wall properties are under development. Since 2008, QUEST has developed through collaborative research with plenty of domestic and international institutes. Expected future collaborations are as follows,

  • 1-1 ) Steady state operation of high temperature plasmas and plasma wall interaction (PWI)
  • 1-2 ) Plasma heating by electron cyclotron wave (ECW), and microwave application to plasma diagnostics
  • 1-3 ) Development of particle circulation and plasma control
  • 1-4 ) Plasma wave-particle interaction

Regarding 1-1, our group is interested in the research topics related to plasma facing components as follows; time evolution of particle recycling, deposition of metallic impurity, heat flux distribution, the relationship between surface temperature and particle recycling. As 1-2, the topic is about a plasma reaction with electromagnetic and electrostatic waves that are injected through the newly developed antenna. Development of microwave diagnostics for plasma research is also proposed. Through 1-3, our group needs to develop new methods for plasma control and their applications. In 1-4, using plasma waves, we pursue physical principles of plasma particle acceleration, and plasma maintenance by spontaneous current.

Other than these topics, new ideas will also be welcomed.

2 ) Collaborative research on fusion material

There are many correlated branches of study between fusion plasma and fusion and fission material. It has become increasingly important to study the plasma materials' interactions and develop plasma facing materials which are strongly resistant to plasma, as produced plasma tends to resemble core plasma in fusion reactors. Since QUEST is one of the novel machines in the world, which is able to conduct SSTO for longer than 5 hours. This experimental environment has provided many fruitful results PWI studies.

In RIAM, related divisions have already started research into fusion reactor materials, and AFRC has greatly accelerated research in this field. Studies into PWI were started with QUEST since 2008. Expected collaboration is listed as follows.

  • 2-1 ) Study of PWI in QUEST
  • 2-2 ) Study of the Elementary Process of PWI using Simulation Experiments
  • 2-3 ) Development of Plasma Facing Components
3 ) Collaborative research on plasma turbulence

Research on plasma turbulence at RIAM aims at elucidating the dynamics of turbulent transport phenomena in inhomogeneous magnetized plasmas and at formulating the physical processes of non-local transport phenomena.

We adopt, in particular, the methodology of e-Science, or integrating the major methodologies of science, i.e., theory, simulation and experiment, to accomplish the scientific purposes of the project. The following study subjects are envisioned to further develop this method. Other new proposals are also welcomed.

3-1 ) Structural Formation and Selection Rules in Turbulent Plasma
  1. Statistical theory for multi-scale turbulence
  2. Transition theory for multi-scale turbulence
  3. Phase-space turbulence theory
  4. Development of TDS (Turbulence Diagnostic Simulator)
  5. Turbulence simulation study by NLD (Numerical Linear Device)
  6. Numerical Diagnostic of Turbulence Simulation Data and its Comparison with Experiments and Theories
  7. Observation of turbulence dynamics in PANTA
  8. Development of advanced turbulence diagnostics in PANTA
3-2 ) Integrated simulation study of burning plasma
  1. Theory and simulation study of multi-scale extended MHD model
  2. Theory and simulation study of multi-scale plasma turbulence
  3. Multi-scale edge plasma modeling
  4. Integrated multi-scale simulation on the transport, heating and current drive
  5. Modeling of the integrated code and development of the scheme of parallel computing

( 3 ) Early Career Joint Research

Joint research related to the research content indicated in "(2) International Joint Research" section is welcome. On an application, please contact with your RIAM advisor in advance.

( 4 ) Standard Joint Research

Joint research related to the research content indicated in “(2) International Joint Research” section is welcome.

( 5 ) Research Workshop

Proposals for Research Workshops are welcome on the dynamics of Nuclear Fusion. Also challenging and interesting subjects are welcome in expectation of future developments in the dynamics of Nuclear Fusion. Proposals for research workshops in this category are listed as follows,

  1. Workshop on toroidal plasma
  2. Workshop on nuclear fusion materials
  3. Workshop on theory of nuclear fusion and related plasmas
  4. Workshop on nuclear fusion and related plasmas with a broader perspective
  5. Round tables on challenging, evolving, and related subjects

　

　

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