Simulation projects

Here, BA simulation projects implemented or being implemented by using computer resources summarized in the above table are briefly explained year by year. 

   BA simulation projects using JFRS-1 in the 2nd cycle
(from April 2021 to March 2022)

Very recently, Call for proposals for BA simulation projects in JFRS-1 in FY 2021 has been launched and closed on 17 Feb. 2021. In total 28 proposals were submitted. The 28 proposals are categorized into 3 types: 17 EU projects with EU PI, 4 JA projects with JA PI and 7 Joint projects with EU (JA) PI and JA (EU) co-PI.

The distribution of the 1st priority areas specified by PIs (when plural areas; N > 1 are selected by PIs 1/N is assigned to each areas) is indicated in the table below: 

Key issues such as Disruption and Technology for ITER, Divertor, Materials and Technology for DEMO, Turbulence for JT-60SA are covered as targets with high priority as shown in blue. This result is in line with the IFERC objective to support ITER, JT-60SA and IFMIF/EVEDA and to consolidate the know-how for the development of future fusion reactors (DEMO). 

The peer review for submitted proposals has been implemented according to the 4 criteria described in the Call for proposals, and JAC selected the projects and allocated the node-hours to selected projects based on the results of the peer review. As a result, all the proposals have been selected, and all the available node-hours are assigned to proposals.

The table below denotes project title (acronym), PIs, comment (targets) and allocated node-hours for 17 EU projects with EU PI.

EU (BA in JFRS-1 in FY 2021)
Project Title (acronym) pl Comment k node-hours
Large scale DFT study of defects and adsorption of impurities in tungsten for fusion applications (BigDFT4W) J. J. G. Moreno [Barcelona Supercomputing Center] A detailed ab-initio study on the W structural stability of defects and adsorbed H and He species using the Linear Scaling Density Functional Theory (LS-DFT) methods implemented within the BigDFT code. 350
Atomistic simulation of decomposition phenomena in W and Fe based alloys in fusion applications (DECOMP) D. Sopu [The Erich Schmid Institute of Materials Science] To understand clustering phenomena of W and Fe by a combination of ab-initio calculations and classical molecular dynamics simulations 288
High density plasma sheath (HDsheath) D. Tskhakaya [IPP.CR] We plan to develop a new model of the high density plasma sheath, up to 5x1021 m-3, relevant for divertor plasma study of future tokamaks (DEMO, ITER, JT-60SA, COMPASS-U) and our day fusion devices with high density plasma edge. 700
High Fidelity Nuclear Simulations for DEMO (HiFi-NSD) P. Pereslavtsev [KIT] The computational support of newly developed modeling techniques and computational schemes for applications to DEMO nuclear analyses within the Fusion Technology Department (FTD) programme of EUROfusion 327
Improving the physics of quasilinear transport models for use in integrated modelling (IMPQUAT) H. Dudding [CCFE] This project aims to improve quasi-linear models and generate new tools in modelling turbulence. 48
TRIPOLI-4 capabilities assessment in ITER SDDR calculations (ITERTRI4) Y. Peneliau [CEA] The aim of the proposed project is to progress on these investigations of applicability and to replicate the results that MCNP-5 produced in the nuclear analyses of the Visible InfraRed Wide Angle Viewing System (PBS 55.G1 in the ITER Plant Breakdown Structure). 87
Gyrokinetic simulations for JT-60SA (JTGENE) S. Coda [SPC-EPFL] We plan to pursue gyrokinetic simulations with maximal realism to model turbulent fluctuations expected in the JT-60SA fusion device. 450
Monte Carlo radiation transport computations of Neutrons, Electrons, Photons (MCNEP) A. Serikov [KIT] The computational neutronics support for designing and operation of the ITER and DEMO tokamaks. Its objectives include Monte Carlo radiation transport computations of neutrons, electrons, photons for nuclear analyses, neutronics, materials activation and transmutation calculations, and integral modelling for ITER and EU DEMO. 353
MHD Transients and Runaway Electrons (MHD) M. Hoelzl [IPP] The JFRS-1 project at hand will focus on predictive simulations for ITER and JT60-SA and DEMO [TSVV] 994
MHD simulations of fusion plasmas to study nonlinear transport using a new method based on Lagrangian Coherent Structures (PIXIE3D) M. Veranda [RFX] The main aim of the project is studying internal transport barriers (ITBs) formation using so-called Lagrangian Coherent Structures (LCS) 194
Investigation of turbulent transport in confined plasmas for understanding of intrinsic rotation (rotation) K. Pavlos [National Technical Univ. of Athens] The main objective of this work is to implement the new model for the intrinsic rotation in an already existing gyrokinetic code, use another code for computing the neoclassical corrections and use the outputs of latter as inputs to the former. 118
Simulations of electron emission from hot tungsten surfaces (SPICE) M. Komm [IPP.CR] Using SPICE2 (2D3V) and SPICE3 (3D3V) PIC codes we plan to investigate the synergies between thermionic emission, secondary electron emission and electron back-scattering. 23
Modelling the Sputtering from PFC (SPUSIM) M. Probst [Univ. of Insbruck] We propose to systematically investigate the influence of impact energy and angle on sputtering and to analyse these quantities also for the outgoing particles. We plan to extend the parameter space by including target temperature, target microstructure and technological materials parameters. Targets are Be, W, Fe and alloys of them. 223
BOOSTING GYROTRON CAVITY PERFORMANCE BY ENHANCING HEAT REMOVAL (STARGATE) L. Savoldi [LTP ENEA] To perform detailed investigations to enhance the heat transfer in the gyrotron cavity for future tokamaks 16
Gyrokinetic investigation of a negative triangularity DEMO (TURBGENE) J. Ball [SPC-EPFL] By using nonlinear gyrokinetic simulations of realistic positive and negative triangularity DEMO equilibria, we will compare and contrast the turbulent transport occurring in each. 250
VisIR WAVS in ITER EP#12 (VIWAVS12) Y. Peneliau [CEA] The current nuclear analysis focuses on the EP#12 location in ITER because the diagnostic (Visual and IR WAVS) will be placed in this location for the first plasma in 2025. 22
Liquid metal MHD flows in WCLL blankets (WCLLmhd) C. Mistrangelo [KIT] To support the optimization of the WCLL blanket design, in particular of the configuration of the cooling pipe system in the breeding zone by investigating MHD convective flows. 70

The table below denotes project title (acronym), PIs, comment (targets) and allocated node-hours for 4 JA projects with JA PI.

JA (BA in JFRS-1 in FY 2021)
Project Title (acronym) Pl Comment k node-hours
Global Gyrokinetic simulation for High Beta plasma (GGHB) K. Imadera [Kyoto univ.] 1) we perform flux-driven electrostatic simulation to understand the physical mechanism of ITB formation to achieve high-beta plasma. Especially we focus on ITB formation in weak magnetic shear plasmas. 2) we develop global electromagnetic version of GKNET with numerical magnetic equilibria. The code is extended to treat non-circular plasma with high-beta value. 3) we perform global electromagnetic simulation to study the transport physics in high-beta plasma. We study the transport in reversed shear and weak shear plasmas as well as normal shear plasmas. 4) we investigate the transport of energetic particles due to the toroidal Alfven eigenmode to contribute the design of DEMO. 1574
Integrated numerical disruption experiment for Broader Approach (INDEXBA) A.Matsuyama [QST] The first is an integrated modelling of Shattered Pellet Injection (SPI) in ITER. The second is the characterization of the RE wall impact in order to develop the strategies to allow protection of the first wall by the installation of sacrificial limiter in the JA and/or EU DEMO design. 250
Study of Multiple Impurity seeding effect by integrated divertor code SONIC (MISONIC) S. Yamoto [QST] (1) predictive simulations of JT-60SA divertor plasma, and (2) analysis of the JT-60U experiments, considering not only single but also mixed seeding of impurities 425
Collaboration on code development and simulations of tokamak edge MHD and turbulence (TOKEDGE) H. Seto [QST] ELMs in a series of modeled ITER equilibria with different pedestal collisionality are numerically investigated by the 4-field ELM module elm-4f to imitate the transition of operation point from peeling-ballooning mode branch (type-I ELM) to ballooning mode branch observed in JET-ILW with high D2 gas puff rate by changing pedestal ion density profiles. 455

The table below denotes project title (acronym), PIs, comment (targets) and allocated node-hours for 7 Joint projects with EU (JA) PI and JA (EU) co-PI.

Joint (BA in JFRS-1 in FY 2021)
Project Title (acronym) Pl Comment k node-hours
Ab initio evaluation of H/He segregation to prismatic dislocation cores in W and WReTaOs (AbInSeg) PI T. D. Swinburne [CEA/CNRS] co-PI Y. Watanabe [QST] To calculate segregation energies of H and He to prismatic dislocations in pure W and WReOsTa alloys using novel flexible boundary condition technique 40
Alpha driven instabilities in JET DTE2 (ALPHAJET) PI Y. Todo [NIFS] co-PI R. Coelho [IST] To predict the AEs and the AE-induced alpha transport in the “after-glow” scenario of the JET DTE2 using MEGA, MISHKA, CASTOR, and CASTOR-K codes. 270
Effect of impurities on beryllium swelling (Be-Swell) PI P. Vladimirov [KIT] co-PI M. Nakamichi [QST] Study of impurity interactions with both vacancies, interstitials and free surfaces with various orientations for beryllium swelling 350
Global Nonlinear Simulation of Energetic Particle Transport in Tokamak Plasmas (EPTRANS) PI A. Bierwage [QST] co-PI X. Wang [IPP] JA: the upcoming DTE2 campaign at JET. Concretely, we explore ways to unambiguously identify Alfven modes driven by DT fusion alphas in sawtoothing plasmas. EU: exploring energetic particle dynamics in plasmas of various shapes, in order to clarify the effects of negative triangularity on fast ions. 210
Data Driven analysis for GYSELA (GYS_DATA) PI Y. Asahi [JAEA] co-PI V. Grandgirard [CEA, IRFM] Developing an in-situ data analysis method for large scale gyrokinetic simulation data and establishing the methodology to extract the phase space pattern formation during the avalanche like transport events. 120
Monte Carlo Fusion Neutron Source (MCFNS) PI Y. Qui [KIT] co-PI K. Kondo [QST] The project MCFNS (Monte Carlo Fusion Neutron Source) is a proposal aiming at provide key neutronics capabilities to support the IFMIF-DONES project as well as LIPAc activities in BA-II. 300
SOL-divertor plasma Simulation study for fusion DEMO reactor (SSDEMO) PI N.Asakura [QST] co-PI F.Subba [Politecnico de Torino] Power exhaust study in the EU DEMO divertor for benchmark between SONIC and SOLPS-ITER. He exhaust study for the JA DEMO divertor design, using SONIC code. 495

BA simulation projects using Marconi 100 in the 2nd cycle
(from April 2021 to March 2022)

Taking into account difficulties in converting codes from ones suitable to conventional cpu to ones suitable to GPU, BA simulation projects using Marconi 100 selected in the 1st cycle are treated as promising candidates, when PIs desired. Including one new proposal, in total 5 projects were selected.

Project Title (acronym) Pl category k node-hours
Performance portable GYSELA (PP-GYS) Y.Asahi [JAEA] Plasma turbulence and related transport processes 6
Machine Learning for further understandings on Plasma-Wall-Interactions (MLPWI) K. Ibano [Osaka univ.] Edge physics, Reactor materials & technology 5
Helium Bubble Behaviors in Fe (HeBubble) T. Okita [Univ. Tokyo] reactor materials 40
Particle transport in burning plasmas (P-TRANS) M.Yagi [QST] Plasma turbulence and related transport processes, Integrated modelling of fusion plasmas 10
GyroKinetic Numerical Experimental Tokamak based Deep Learning (GKNET_DL) K. Imadera [Kyoto univ.] Plasma turbulence and related transport processes, Integrated modelling of fusion plasmas 15.6

   BA simulation projects using JFRS-1 in the 1st cycle
(from April 2020 to March 2021)

It has been decided in the governing board level in the first quarter of 2020 that a half of the total resources of JFRS-1 in Rokkasho was provided to both EU and JA users as JA host contribution in BA Phase II. In line with the objectives of IFERC project, simulation projects addressing issues relevant to fusion development programmes such as ITER, JT-60SA, DEMO and IFMIF/EVEDA were selected from each domestic projects: 20 projects for EU and 7 projects for JA due to time constraint. 

The table below indicates 20 projects selected from EU projects, where 4, 8 and 8 projects have been selected from projects related to EUROfusion TSVV, projects related to the exploitation of JT-60SA and projects related to ITER and DEMO, respectively. TSVV means Theory, Simulation, Validation, and Verification programme, and the key goal will be to produce a high-quality suite of “EUROfusion -standard” software to interpret data from ITER and associated facilities, and reliably extrapolate to inform DEMO design. E-TASC means EUROfusion Theory and Simulation Coordination, and the vision is to integrate the world-class fusion science and engineering with emerging advanced computing capability.

EU (BA in JFRS-1 in FY 2020)
Project Title (acronym) Pl Comment k node-hours
Non-linear MHD simulations of disruptions and ELMs and developments for code efficiency and stellarator geometry (AUGJOR) M. Hoelzl [IPP, Garching] EUROfusion High Priority tsvv project 250
E-TASC European Boundary Code (EBC) P. Tamain [CEA] EUROfusion High Priority tsvv project 250
L- and H-mode pedestal characterization (LHPEDSIM) T. Görler [IPP, Garching] EUROfusion High Priority tsvv project 250
Basic study and experimental modeling of internal transport barriers with gyrokinetics (TURB-GENE) J. Ball [EPFL] EUROfusion High Priority tsvv project 250
Nonlinear MHD Simulation of ELMs and their Interaction with the SOL (ELM-UK) S. PAMELA [CCFE] Provide reliable predictions of these divertor heat fluxes during ELMs for future devices like MAST-U, JT-60SA, ITER and DEMO. Simulations of JT-60SA will explore the variability and uncertainty of ELM stability for predicted scenarios. 300
Realistic simulations for JT-60SA (JTGENE) S. Coda [EPFL] Gyrokinetic simulations with maximal realism to model turbulent fluctuations expected in the JT-60SA fusion device 300
Investigation of Finite Orbit Width Effect on NTM Threshold (NTMTHR) K. Imada [York univ.] Investigation of Finite Orbit Width Effect on NTM Threshold making predictions for ITER and JT-60SA 200
Linear and non-linear characterization of Alfven Eigenmodes in EU JT-60SA scenarios (JT-LANE) R. Coelho [IST] Linear and non-linear characterization of Alfven Eigenmodes in EU JT-60SA scenarios. 12 possible equilibria taking into account the several planned operational scenarios in JT60-SA 200
Non-linear MHD simulations of pellet triggered ELM (JOREK_P) S. FUTATANI [Polytechnic Univ. Catalonia] Modelling of optimized condition for pellet triggered ELM in JT60-SA 200
Turbulent transport in optimized confinement configurations (MULTEI) M. Barnes [Univ. Oxford] Propose to study what triggers and limits ITBs in JET and JT60-U before making predictions for advanced JT60-SA scenarios 200
Edge modelling in conventional and advanced divertor configurations on present and future fusion devices (EMCAD) P. Innocente [RFX, Padova] For JT-60SA the main aim is the optimization of the proposed experimental scenario, while on DTT and DEMO the activity is devoted to select the better magnetic configuration and optimize the divertor geometry. 200
Impact of shaping on electron heat transport (GEO-GYS) Y. SARAZIN [CEA] The project has also a connection with the JT60-SA programme via a lively collaboration with QST/JAEA. The JT60-SA device has some flexibility as to plasma shaping, thus allowing the exploration of regime with improved confinement. 200
3D modelling of global erosion and redeposition in fusion devices (ERO2.0) J. Romazanov [Institute of Energy and Climate Research, Juelich] Predictive modelling of DEMO W erosion and migration by plasma impact: essential input to tritium and dust estimates in the DEMO VV 300
Global electromagnetic gyrokinetic simulations of Alfvénic instabilities in current and future tokamaks (ORBFAST) T. H.-Schneider [IPP, Garching] During the upcoming cycle, we shall extend this – including nonlinearities on all species, and retaining the entire spectrum of TAEs in the system, to make more detailed predictions of the EP transport in ITER. 200
Non-linear MHD simulations supporting the development of disruption mitigation systems (DISJOR) E. Nardon [CEA] Efforts will mainly be devoted to the Shattered Pellet Injection (SPI) experiments in JET and the future SPI experiments in ASDEX Upgrade. Third, to answer specific questions related to the development of the ITER DMS, for which purpose ITER simulations will be run. 200
Kinetic modelling of the SOL (IV) (KinEdge (IV)) D. Tskhakaya [IPP, CR] Estimates of the power loads to the COMPASS-U and ITER divertor plates, 200
Effects of thermionic emission (ETTM1) T. Gyergyek [Univ. Ljubljana] If possible, we shall add a simple thermal model of a ITER-like monoblock, to calculate the surface temperature in the loop, thus making the emission model self-consistent. 200
High Fidelity Neutronics Simulations for DEMO (HiFi-NSD) P. Pereslavtsev [KIT] Nuclear analyses and utilization of those achievements to design and optimization studies for ITER, 200
Kinetic simulations of SOL dynamics 3 (SOLDyn3) J. Kovačič [Jozef Stefan Institute] Research the effects of neutrals on the momentum and energy transport in the case of Type I ELMs in ITER 200
Hybrid MHD-Gyrokinetic Simulations of Global Alfvén Modes in Fusion Plasmas-3 (HYMHDGK3) G. Vlad [ENEA] Hybrid MHD-Gyrokinetic Simulations of Global Alfvén Modes in Fusion Plasmas to allow facing this problem in the range of parameters of interest to ITER 200

The table below indicates 7 projects as JA projects

JA (BA in JFRS-1 in FY 2020)
Project Title (acronym) Pl Comment k node-hours
Global Nonlinear Simulation of Energetic Particle Transport in Tokamak Plasmas (EPTRANS) A. Bierwage [QST] Simulation study of Alfven eigenmodes driven by energetic alpha particles from DT reactions for supporting the second D-T-Experiment (DTE2) campaign at JET. 590
Hybrid Simulations of Energetic Particle Driven Instabilities (HSEPDI) Y. Todo [NIFS] Comparative study of interaction of EP with MHD modes between tokamak and LHD, Effects of ICRF heating on time evolution of Alfven eigenmodes, EP driven instabilities in Heliotron-J 600
Study of Multiple Impurity seeding effect by integrated divertor code SONIC (MISONIC) S. Yamoto [QST] Prediction of multi-species impurity transport in JT-60SA SOL plasma, analysis of JT-60U experiments, benchmark with SOLPS-ITER code. 425
SOL-divertor plasma Simulation study for fusion DEMO reactor (SSDEMO) N. Asakura [QST] He exhaust study for JA DEMO divertor design using SONIC code, and power exhaust study in EU DEMO divertor for benchmark between SONIC and SOLPS. 473
Collaboration on code development and simulations of tokamak edge MHD and turbulence (TOKEDGE) H. Seto [QST] Development of tokamak edge MHD/turbulence simulation code for ELM simulations with plasma profiles observed in tokamaks with metal wall. 1000
Simulation study towards integrated numerical disruption experiment (INDEX) A. Matsuyama [QST] Simulation study of disruption phenomena (thermal quench, VDE, halo current, runaway electrons) for ITER, JT-60SA 511
Global Gyrokinetic simulation for High Beta plasma (GGHB) K. Imadera [Kyoto Univ.] Simulation study for ITB formation toward high-beta plasmas, and linear/nonlinear simulations of turbulent transport in high beta tokamak plasmas in realistic configurations 1020

The simulation projects on JFRS-1 for cycle 1 (27 projects) were analyzed based on their proposals. As shown in the figure below, more than half of the 27 projects (14 projects) are related to Edge physics area which is one of the most important areas for fusion development. Turbulence and MHD are the next popular (10 projects for each). Fast particle physics (6 projects), Integrated modelling (5 projects), Reactor materials (2 projects) and Reactor technology (1 project) follow, and no project is related to H&C.

Major important topics may covered by the current projects, but the edge turbulence area such as the L-H transition seems to be weak. 

Below is a summary of numbers of projects which are related to ITER, JT-60SA, DEMO and the other machines, respectively. Many projects are concerned with ITER (16/27) and JT-60SA (9/27). Projects related to DEMO are not so many. Other includes several devices such as smaller tokamaks, ST, stellarator/heliotron.

   BA simulation projects using Marconi 100 in the 1st cycle
(from April 2020 to March 2021)

Call for interest was issued to JA users, and all 7 projects whose PIs showed positive reply were selected.

Project Title (acronym) Pl category k node-hours
Performance portable GYSELA (PP-GYS) Y.Asahi [JAEA] Plasma turbulence and related transport processes 6
Machine Learning for further understandings on Plasma-Wall-Interactions (MLPWI) K. Ibano [Osaka univ.] Edge physics, Reactor materials & technology 5
Helium Bubble Behaviors in Fe (HeBubble) T. Okita [Univ. Tokyo] reactor materials 30
Molecular dynamics simulation of hydrogen recycling in plasma-facing materials for Neutral transport code (MD_HRCYC) S. Saito [Yamagata univ.] Edge physics, Reactor technology 5
Investigation of effects of beta decay of tritium on DNA (T_DNA) S. Saito [Yamagata univ.] Fast particle physics 5
Spatio-temporal dynamics of turbulence clump in fusion plasmas (STDT) M. Sasaki [Kyusyu univ.] Plasma turbulence and related transport processes 20
Particle transport in burning plasmas (P-TRANS) M.Yagi [QST] Plasma turbulence and related transport processes, Integrated modelling of fusion plasmas 10

   Joint EU-JA HPC simulation projects (JSPs)
(from April 2020 to March 2021)

The purpose of the “Joint EU-JA HPC simulation projects” (JSPs) was to foster the collaborative joint simulation projects between EU and JA researchers in the magnetic fusion energy research and development including reactor materials and technology as wider as possible, by providing a fraction of the supercomputer funded by EUROfusion for EUROfusion users (Marconi-Fusion located in CINECA) and a similar fraction of the new supercomputer funded by QST for Japanese users (JFRS-1 located in Rokkasho) from April 2019 to March 2020. The JAC implemented the peer review to rank the proposals based on the 4 criteria described in the “Call for proposals”, and the peer review process ended on 19 March. Then, the JAC selected the top 5 out of 10 proposals based on the ranking by the peer review, taking into account 1) fostering the collaborative joint simulation projects between EU and JA researchers in the magnetic fusion energy research and development including reactor materials and technology as wider as possible suggested in the “Call for Proposals”, and 2) assigning a sufficient CPU time for researchers of the selected projects to implement the production runs leading to achievements to be reported as shown in the table below. 

Since the organization of JSPs based on the collaboration with EU (JA) PI and JA (EU) co-PI was the first trial, the period of the projects was extended up to Sep. 2020 based on the users’ request, taking into account the characteristics of joint simulation projects and the state of progress. 

In summary, it is considered that although various difficulties were seen, there are many benefits in the JSPs:

  • EU and JA researchers analyse the same experimental results by using their own research tools (simulation code(s)) developed independently, which leads to deepening understanding of the physics underlying experimental results,
  • Experimental results obtained in EU device are analysed by JA researchers with their own code(s) and vice versa, which leads to mutual understanding,
  • Benchmark tests of the state-of-the-art simulation code(s) developed by EU and by JA independently are accelerated, which leads to further improvement of the state-of-the-art simulation code(s).
Title (acronym) PI & co-PI category Marconi A3 (A2) [k node-hours] JFRS-1 [k node-hours] Extension
Investigating the role of ETG in JET-DT and ITER relevant regimes with multi-scale gyrokinetics (GKETG) PI : J. Citrin [DIFFER], co-PI : S. Maeyama [Nagoya Univ.] Turbulence 223 176 done
Kinetic Electrons in GYSELA & GT5D (KEGG) PI : G. Dif-Pradalier [CEA], co-PI : Y. Asahi [QST] Turbulence 333 (199) 226 done
Stability of shear Alfven modes in NBI heated JET plasmas (MEGAJET) PI : R. Coelho [IST, Portugal], co-PI : Y. Todo [NIFS] Energetic Particles 57 79 done
ASCOT simulations of LHD Nov2018 fast ion experiments (LHDASC18) PI : S. Äkäslompolo [IPP Greifswald] co-PI : Y. Suzuki [NIFS] Energetic Particles 35 6
Simulation of beryllides for fusion applications (BERYLLID) PI : P. Vladimirov [KIT], co-PI : M. Nakamichi [QST] Materials 268 (213) 371 done