Radial homogeneity of geodesic acoustic modes in ohmic discharges with low B in the T-10 tokamak
Bibliographic record
Abstract
The electric potential oscillations in the hot plasma zone have been measured directly using a heavy ion beam probe at the frequencies of geodesic acoustic modes in the T-10 tokamak (the major and minor radii are R = 1.5 m and a = 0.3 m, respectively, and the toroidal magnetic field is B = 1.5–2.5 T). In discharges with the lowered magnetic field B = 1.55 T, the diagnostic beam can probe a rather wide radial plasma region (0.06 < r < 0.28 m). This made it possible to study the radial structure of geodesic acoustic modes. It has been shown that the frequency and amplitude of geodesic acoustic modes in the region under study are constant over the radius in the whole region of observation. Thus, it has been shown experimentally that the observed frequency of geodesic acoustic modes may not correspond to the predictions of the local theory (f∼ √T e ) in a wide radial range comparable with the plasma minor radius. The numerical simulation of the turbulence dynamics using the solution of Braginskii magnetohydrodynamic equations for a peripheral plasma has showed the formation of geodesic acoustic modes in the observed frequency range owing to the nonlinear interaction between broadband turbulence modes.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".