First principles and integrated modelling achievements towards trustful fusion power predictions for JET and ITER

García, J.; Dümont, R.; Joly, J.; Moralès, J.; Garzotti, L.; Bache, T.; Baranov, Y.; Casson, F. J.; Challis, C.; Kirov, K.; Mailloux, J.; Saarelma, S.; Nocente, M.; Banon-Navarro, A.; Göerler, T.; Citrin, J.; Ho, A.; Gallart, D.; Mantsinen, M.; Contributors, Jet

doi:10.1088/1741-4326/ab25b1

Cited by 39 publications

(79 citation statements)

References 38 publications

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“…( 2) = (0.06 ± 0.03) −0.3±0.2 0.77±0.14 −0.15±0.19 � / � −0.11±0.09 0.3±0.4 (13) However, this does not lead to a major improvement in the scaling law. The number of experimental data that are predicted correctly within ±20% increases from 64% to 69%, but the R 2 is reduced from 0.70 to 0.61 (see table 2).…”

Section: Pedestal Scalingsmentioning

confidence: 97%

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Pedestal structure, stability and scalings in JET-ILW: the EUROfusion JET-ILW pedestal database

et al. 2020

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The EUROfusion JET-ILW pedestal database is described, with emphasis on three main issues. First, the technical aspects are introduced, including a description of the data selection, the datasets, the diagnostics used, the experimental and theoretical methods implemented and the main definitions. Second, the JET-ILW pedestal structure and stability are described. In particular, the work describes the links between the engineering parameters (power, gas and divertor configuration) and the disagreement with the peeling-ballooning (PB) model implemented with ideal MHD equations. Specifically, the work clarifies why the JET-ILW pedestal tends to be far from the PB boundary at high gas and high power, showing that a universal threshold in power and gas cannot be found but that the relative shift (the distance between the position of the pedestal density and of the pedestal temperature) plays a key role. These links are then used to achieve an empirical explanation of the behavior of the JET-ILW pedestal pressure with gas, power and divertor configuration. Third, the pedestal database is used to revise the scaling law of the pedestal stored energy. The work shows a reasonable agreement with the earlier Cordey scaling in terms of plasma current and triangularity dependence, but highlights some differences in terms of power and isotope mass dependence.

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Section: Pedestal Scalingsmentioning

confidence: 97%

“…A scaling law for the pre-ELM pedestal height of the density is important for EPED-like models, where the density is an input. A scaling law for the pre-ELM pedestal density using the data included in the present database is given in expression (11), with ne ped in 10 19 m -3 units.…”

Section: Pedestal Scalingsmentioning

confidence: 99%

Pedestal structure, stability and scalings in JET-ILW: the EUROfusion JET-ILW pedestal database

et al. 2020

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“…These experiments were also modelled using the gyrokinetic code GENE (Jenko et al 2000;Görler et al 2011). The simulations have shown that the E × B shearing rate, the effects of collisions and of trapped electrons lead to deviations from the expected gyroBohm scaling in ITG dominated plasmas (Garcia et al 2019). Analyses were also performed for the above L-mode discharge #91450 (hydrogen) by artificially changing the mass from 1 to 2 (Garcia et al 2019).…”

Section: Isotope Dependence Of Global Confinement In Jet-ilw L-modesmentioning

confidence: 99%

“…Analyses were also performed for the above L-mode discharge #91450 (hydrogen) by artificially changing the mass from 1 to 2 (Garcia et al . 2019). With the above effects included, the ratio Q D / Q H is ~0.85.…”

Section: Isotope Dependence Of Global Confinement In Jet-ilw L-modesmentioning

confidence: 99%

“…Predicted and experimental profiles, shown in figure 5, are in good agreement for deuterium, less so for hydrogen, for which temperature and density are overpredicted (Garcia et al . 2019). ITG modes are dominant in the core and the inclusion of E × B shear from NBH driven toroidal rotation in these cases does not lead to an improvement of deuterium confinement relative to hydrogen.…”

Section: Isotope Dependence Of Global Confinement In Jet-ilw L-modesmentioning

confidence: 99%

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Isotope dependence of energy, momentum and particle confinement in tokamaks

Weisen

Maggi²,

Oberparleiter³

et al. 2020

J. Plasma Phys.

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The isotope dependence of plasma transport will have a significant impact on the performance of future D-T experiments in JET and ITER and eventually on the fusion gain and economics of future reactors. In preparation for future D-T operation on JET, dedicated experiments and comprehensive transport analyses were performed in H, D and H-D mixed plasmas. The analysis of the data has demonstrated an unexpectedly strong and favourable dependence of the global confinement of energy, momentum and particles in ELMy H-mode plasmas on the atomic mass of the main ion species, the energy confinement time scaling as ${\tau _E}\sim {A^{0.5}}$ (Maggi et al., Plasma Phys. Control. Fusion, vol. 60, 2018, 014045; JET Team, Nucl. Fusion, vol. 39, 1999, pp. 1227–1244), i.e. opposite to the expectations based only on local gyro-Bohm (GB) scaling, ${\tau _E}\sim {A^{ - 0.5}}$ , and stronger than in the commonly used H-mode scaling for the energy confinement (Saibene et al., Nucl. Fusion, vol. 39, 1999, 1133; ITER Physics Basis, Nucl. Fusion, vol. 39, 1999, 2175). The scaling of momentum transport and particle confinement with isotope mass is very similar to that of energy transport. Nonlinear local GENE gyrokinetic analysis shows that the observed anti-GB heat flux is accounted for if collisions, E × B shear and plasma dilution with low-Z impurities (9Be) are included in the analysis (E and B are, respectively the electric and magnetic fields). For L-mode plasmas a weaker positive isotope scaling ${\tau _E}\sim {A^{0.14}}$ has been found in JET (Maggi et al., Plasma Phys. Control. Fusion, vol. 60, 2018, 014045), similar to ITER97-L scaling (Kaye et al., Nucl. Fusion, vol. 37, 1997, 1303). Flux-driven quasi-linear gyrofluid calculations using JETTO-TGLF in L-mode show that local GB scaling is not followed when stiff transport (as is generally the case for ion temperature gradient modes) is combined with an imposed boundary condition taken from the experiment, in this case predicting no isotope dependence. A dimensionless identity plasma pair in hydrogen and deuterium L-mode plasmas has demonstrated scale invariance, confirming that core transport physics is governed, as expected, by the 4 dimensionless parameters ρ*, ν*, β, q (normalised ion Larmor radius, collisionality, plasma pressure and safety factor) consistently with global quasi-linear gyrokinetic TGLF calculations (Maggi et al., Nucl. Fusion, vol. 59, 2019, 076028). We compare findings in JET with those in different devices and discuss the possible reasons for the different isotope scalings reported from different devices. The diversity of observations suggests that the differences may result not only from differences affecting the core, e.g. heating schemes, but are to a large part due to differences in device-specific edge and wall conditions, pointing to the importance of better understanding and controlling pedestal and edge processes.

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Sanae-Inoue Itoh 1952–2019: a memorial note for a pioneer researcher of plasma bifurcation

Fujisawa

Kasuya

Kosuga

et al. 2023

Rev. Mod. Plasma Phys.

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This memorial note for Professor Sanae-I Itoh presents her specific achievements in physics research alongside her wider record of accomplishment in the field of magnetically confined plasmas. The topics include bifurcation phenomena (e.g., H-mode and improved confinement modes), turbulence-generated structures (e.g., zonal flows and streamers), and fundamental concepts and processes in plasma turbulence (e.g. nonlinear couplings and energy transfer. The note focuses initially on results obtained through her integration of theory, simulation, and experiment, particularly those arising from a low temperature plasma facility at Kyushu University. We then describe contemporary challenges in plasma turbulence which Sanae addressed with great interest, and consider some of the perspectives that were opened by her achievements.

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First principles and integrated modelling achievements towards trustful fusion power predictions for JET and ITER

Cited by 39 publications

References 38 publications

Pedestal structure, stability and scalings in JET-ILW: the EUROfusion JET-ILW pedestal database

Pedestal structure, stability and scalings in JET-ILW: the EUROfusion JET-ILW pedestal database

Isotope dependence of energy, momentum and particle confinement in tokamaks

Sanae-Inoue Itoh 1952–2019: a memorial note for a pioneer researcher of plasma bifurcation

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