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arxiv: 2604.20484 · v1 · submitted 2026-04-22 · ⚛️ physics.plasm-ph

The physics of ELM-free regimes in EUROfusion tokamaks

M. G. Dunne , M. Faitsch , O. Sauter , E. Viezzer , B. Labit , A. Kappatou , D. Keeling , B. Vanovac
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I. Balboa P. Bilkova P. Bohm D. Kos J. Hobirk E. Lerche P. Lomas S. Menmuir T. P\"utterich L. Radovanovic S. Saarelma S. Silburn D. Silvagni E.R. Solano H.J. Sun A. Tookey the ASDEX Upgrade Team The TCV Team The EUROfusion Tokamak Exploitation Team JET contributors
This is my paper

Pith reviewed 2026-05-09 23:28 UTC · model grok-4.3

classification ⚛️ physics.plasm-ph
keywords ELM-free regimesquasi-continuous exhaustnegative triangularityballooning modestokamak pedestalseparatrix densityITER scenariosplasma transport
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The pith

QCE and negative triangularity regimes reach normalized pedestal performance comparable to ELMy H-modes while avoiding large Type-I ELMs.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper explores a range of Type-I ELM-free regimes across EUROfusion tokamaks, focusing on the development of negative triangularity and quasi-continuous exhaust scenarios in ASDEX Upgrade, JET, and TCV. It emphasizes the role of ballooning-mode transport and advances ideal-MHD access models that predict regime entry. For the QCE regime, these models reduce to a minimum separatrix density that aligns with measured values. Normalized pedestal top pressures in QCE plasmas show no significant difference from those in conventional ELMy H-mode. The predicted density threshold for the 15 MA ITER baseline supports QCE as a candidate scenario for ITER and future reactors.

Core claim

Access to the NT and QCE regimes is controlled by ideal-MHD ballooning modes, with QCE entry occurring above a minimum separatrix density that matches experimental observations. When pedestal top values are appropriately normalized, QCE achieves performance levels that do not differ significantly from ELMy H-mode plasmas. This similarity, together with the model's application to the ITER 15 MA baseline, establishes the QCE regime as a viable ELM-free operational scenario for both ITER and future reactors.

What carries the argument

Ideal-MHD access models based on ballooning modes, which govern entry into NT and QCE regimes and can be expressed as a minimum separatrix density criterion for QCE.

If this is right

  • QCE plasmas can maintain high pedestal performance without large Type-I ELMs.
  • The minimum separatrix density provides a practical predictor for accessing the QCE regime in experiments.
  • Both NT and QCE rely on ballooning-mode transport to remain ELM-free.
  • These regimes become relevant operational scenarios for the 15 MA ITER baseline and future reactors.
  • Progress in ideal-MHD models improves understanding of multiple ELM-free regimes across EUROfusion devices.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • The separatrix density threshold could be tested as a control knob in other tokamaks to trigger QCE-like behavior.
  • If the normalized performance holds, reactor designs might adopt QCE without major trade-offs in fusion power density.
  • Ballooning-mode physics might link QCE and NT to other ELM-free regimes such as QH or I-mode, suggesting shared access criteria.
  • Nonlinear simulations could check whether kinetic effects alter the ideal-MHD density threshold at ITER scales.

Load-bearing premise

That ideal-MHD ballooning-mode models fully capture the physics of entry into the NT and QCE regimes without requiring kinetic, nonlinear, or resistive effects, and that the normalization procedure allows fair comparison of pedestal values across regimes.

What would settle it

A measurement of separatrix density at QCE onset in a high-current plasma that falls substantially below the predicted minimum, or normalized pedestal top values in QCE that differ markedly from ELMy H-mode levels, would falsify the access models and performance claims.

Figures

Figures reproduced from arXiv: 2604.20484 by A. Kappatou, A. Tookey, B. Labit, B. Vanovac, D. Keeling, D. Kos, D. Silvagni, E. Lerche, E.R. Solano, E. Viezzer, H.J. Sun, I. Balboa, JET contributors, J. Hobirk, L. Radovanovic, M. Faitsch, M. G. Dunne, O. Sauter, P. Bilkova, P. Bohm, P. Lomas, S. Menmuir, S. Saarelma, S. Silburn, the ASDEX Upgrade Team, The EUROfusion Tokamak Exploitation Team, The TCV Team, T. P\"utterich.

Figure 1
Figure 1. Figure 1: Schematic of Type-I ELM avoidance for QCE (green) and NT (blue) plasmas vs an ELMy H-mode (red) in a j-α diagram where j is the peak edge current density and α is the normalised pressure gradient. The stars indicate the operational point expected in an experiment. The region of stability lies in the lower left of the plot, and above and to the right of each curve is the unstable region. paper will, however… view at source ↗
Figure 2
Figure 2. Figure 2: Left: AUG NT shape (green) and its TCV counterpart (red). Right: the JET NT shape (blue) and its TCV counterpart (red). modelling also indicated that a negative triangularity shape which could be performed on the JET tokamak should also avoid H-mode access. Scaled versions of each of these shapes were developed on TCV and, combined with an NBI heating power ramp, verified H-mode avoidance in the range of r… view at source ↗
Figure 3
Figure 3. Figure 3: NBI heating power (a), upper (dash-dot), lower (dashed), and average (solid) triangularity (b), plasma stored energy (c), and Greenwald fraction (d) for the TCV companion plasma to the JET NT shape. Despite the significant injected power no LH transition can be seen. plasma shape; figure 4 shows time-traces from a less strongly shaped plasma (red) and a more strongly shaped (i.e. less negative triangularit… view at source ↗
Figure 4
Figure 4. Figure 4: Timetraces of AUG discharges 43114 (red, ELMy) and 43493 (black, ELM￾free) showing (a) heating power, (b) upper (dot-dashed), lower (dashed), and averaged (solid) triangularity, (c) the signal from a bolometry LOS acting as ELM monitor, (d) zoom into the ELM signal for the ELMy discharge, and (e) zoom onto the same signal for the ELM-free discharge during a phase of heating power comparable to the time win… view at source ↗
Figure 5
Figure 5. Figure 5: Time-traces of (a) injected heating power, (b) plasma density, (c) plasma stored energy (solid) and H98,y2 (dashed), (d) and (e) ELM monitors. indicating quite low normalised confinement; high confinement was not expected in this discharge, as outlined previously. The ELM monitor signals in panels (d) and (e) show no ELM-like activity over the majority of the discharge. Filaments become visible only at the… view at source ↗
Figure 6
Figure 6. Figure 6: Plots of the (a) main ion fuelling, (b) pedestal top (solid) and separatrix (dashed) density and ELM monitor during the flat-top of an AUG QCE discharge. Middle: Zoom onto the ELM monitor during the ELMy phase of the discharge. Bottom: Zoom onto the ELM monitor during the QCE phase, highlighting the difference in amplitude of the QCE filaments in comparison to large Type-I ELMs. shaping possible in a parti… view at source ↗
Figure 7
Figure 7. Figure 7: Critical (purple) and expected (red) αedge vs ne,edge. The critical separatrix density is found at the intersection of both lines, above which one expects access to the QCE regime. demonstration of the QCE at JET[18, 48], enabled by understanding of the operational space of the QCE from the separatrix parameters[15, 17] and MHD stability[40, 32]; a sufficiently high shaping parameter (defined as Sd = κ 2.2… view at source ↗
Figure 8
Figure 8. Figure 8: Normalised separatrix density vs plasma shaping for a range of scenarios in (a) JET, (b) AUG, and (c) TCV. Red points indicate data from ELMy plasmas, while black indicates QCE phases. The horizontal grey box indicates the range of minimum normalised separatrix density for QCE access, while the stars show the predicted ITER minimum normalised density. same way, predictions of the critical separatrix densit… view at source ↗
Figure 9
Figure 9. Figure 9: Normalised pedestal top temperature vs density for (a) JET, (b) AUG, and (c) TCV in QCE (black) and ELMy (red) plasmas. The isobars (dashed grey) indicate lines of constant βe,pol,ped with values of 0.08 and 0.2 for each device. The blue ellipises in each figure indicate the projected operational space of the ITER pedestal. particularly λp, and lies at approximately 50%nGW; one should note that there is no… view at source ↗
Figure 10
Figure 10. Figure 10: Temperature vs density for two JET QCE scenarios at 1.5 MA (stars) and 2 MA (squares) in D (blue) and DT (gold) operation. The green shapes correspond to IPED predictions for the pedestal height in both scenarios. in density when changing from D to DT plasmas, as has been already reported[18]. Overlayed on figure 10 are green shapes corresponding to IPED predictions for the pedestal height in each of the … view at source ↗
Figure 11
Figure 11. Figure 11: Time-traces of (a) plasma heating power, (b) upper, lower, and average triangularity, (c) D fuelling rate, (d) core density measured by Thomson Scattering, (e) plasma stored energy (solid) and normalised confinement time (dashed), and (f) tile temperature for JET QCE (blue) and NT (red) discharges. 11. Panel (a) shows the heating power for the QCE (blue) and NT (red) discharges, panel (b) the core plasma … view at source ↗
Figure 12
Figure 12. Figure 12: Profiles of electron density (a) and temperature (b) for JET QCE (blue, #105496) and NT (red, #105827) discharges (data are taken from both pulses between 55.0-55.3 s); the scenarios exhibit similar electron (and ion, not shown) temperature profiles, but the QCE discharge has a significantly higher density, stemming from a strong pedestal gradient. heating power. A comparison of the electron temperature a… view at source ↗
read the original abstract

The development of operational scenarios without large Type-I ELMs is of utmost importance for the stable operation and longevity of future tokamaks. The EUROfusion tokamak exploitation program has therefore made the understanding of ELM-free regimes a major topic of exploration across all its contributing devices (ASDEX Upgrade, JET, MAST-Upgrade, TCV, and WEST). An integrated program to investigate a range of Type-I ELM-free regimes has been developed covering the enhanced D-alpha (EDA), magnetic perturbations (MP), negative triangularity (NT), quasi-continuous exhaust (QCE), quiescent H-mode (QH), the baseline small ELMs (SE), I-mode, and X-point radiator (XPR) regimes. This contribution focuses on the development and understanding of the NT and QCE regimes on ASDEX Upgrade, JET, and TCV. The importance of transport via ballooning modes in both regimes is highlighted, as well as the progress in developing access models based on ideal-MHD. In the case of the QCE, this can also be expressed as a minimum separatrix density, which corresponds well to experimentally measured separatrix densities. Particular focus is paid to the performance of the QCE in terms of the achieved pedestal top values, which, when appropriately normalised, do not differ significantly from ELMy H-mode plasmas. This, combined with the predicted minimum separatrix density for the 15 MA ITER baseline plasma, highlight the relevance of the QCE as a potential operational scenario for both ITER and future reactors.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

2 major / 2 minor

Summary. The manuscript reviews the EUROfusion tokamak program on Type-I ELM-free regimes across ASDEX Upgrade, JET, MAST-Upgrade, TCV, and WEST, with primary focus on negative triangularity (NT) and quasi-continuous exhaust (QCE) regimes. It highlights the role of ballooning-mode transport, presents ideal-MHD-based access models (including a minimum separatrix density criterion for QCE that is stated to match experimental measurements), reports that appropriately normalized QCE pedestal-top values are statistically comparable to those in ELMy H-mode, and extrapolates the QCE minimum-density criterion to the 15 MA ITER baseline scenario to argue for its reactor relevance.

Significance. If the ideal-MHD access models are shown to be robust and the normalized pedestal comparisons hold under detailed scrutiny, the work would strengthen the case for QCE as an ELM-free operational scenario for ITER and future devices by linking experimental observations to a predictive density threshold. The integrated multi-device approach and emphasis on ballooning physics provide a useful framework for scenario development, though the absence of quantified kinetic/resistive corrections limits immediate applicability.

major comments (2)
  1. [Abstract / QCE access model section] The central claim that the ideal-MHD ballooning-mode access model yields a minimum separatrix density 'which corresponds well to experimentally measured separatrix densities' and can be extrapolated to ITER requires explicit derivation steps, error bars, and sensitivity analysis to finite-Larmor-radius or resistive effects at the separatrix; without these, the ITER 15 MA prediction rests on an untested assumption of model completeness.
  2. [QCE performance comparison] The statement that QCE pedestal-top values 'when appropriately normalised, do not differ significantly from ELMy H-mode plasmas' is load-bearing for the performance claim, yet the normalization procedure, choice of reference quantities, and statistical test for 'no significant difference' are unspecified; alternative normalizations could alter the conclusion and affect the reactor-relevance argument.
minor comments (2)
  1. [Abstract] The abstract lists multiple regimes (EDA, MP, NT, QCE, QH, SE, I-mode, XPR) but provides quantitative details only for NT and QCE; a brief summary table of key parameters across all regimes would improve clarity.
  2. [Results sections on QCE and NT] No mention of dataset size, discharge statistics, or uncertainty quantification for the separatrix-density comparison or pedestal-top values; adding these would strengthen the experimental support.

Circularity Check

0 steps flagged

No significant circularity; claims anchored in experimental correspondence and independent modeling.

full rationale

The abstract and described content present the minimum separatrix density as corresponding to measured experimental values rather than defined by the model, and the pedestal normalization is presented as a comparison tool without evidence of it being a fitted input renamed as prediction. Access models are described as progress in ideal-MHD development, with no quoted self-definitional loops, self-citation load-bearing for uniqueness, or ansatz smuggling. The ITER extrapolation is framed as a prediction based on the model, not a tautology. This is the common honest non-finding for papers that validate against data.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

The claims rest on standard ideal-MHD assumptions for ballooning stability and on the validity of the chosen normalization for pedestal comparisons; no new free parameters, ad-hoc entities, or non-standard axioms are introduced in the provided abstract.

axioms (1)
  • domain assumption Ideal MHD provides a sufficient description for predicting access to ballooning-dominated ELM-free regimes
    The paper states that access models are based on ideal-MHD and that transport via ballooning modes is important in both NT and QCE.

pith-pipeline@v0.9.0 · 5717 in / 1444 out tokens · 21269 ms · 2026-05-09T23:28:25.033175+00:00 · methodology

discussion (0)

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Reference graph

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