Observation of radial propagation of drift waves in the STOR-M tokamak
Bibliographic record
Abstract
Summary form only given, as follows. We report experimental observation of radially outward propagation of drift type waves in the edge region of STOR-M tokamak (B = 0.7 T, plasma current 25 kA, average electron density 10/sup 13/cm/sup -3/, q = 3). Density and potential fluctuations were measured with an array of Langmuir probes and propagation nature of fluctuations was analyzed by calculating cross-correlation functions in both poloidal and radial directions. The radial propagation Speed is approximately 8 /spl times/ 10/sup 5/ cm/s when B = 0.7 T. It increases when the magnetic field is lowered in a manner approximately inversely proportional to the magnetic field. Poloidal propagation of fluctuations in the electron diamagnetic direction observed earlier was also confirmed. At B = 0.7 T, the poloidal propagation speed of /spl sim/2 /spl times/ 10/sup 6/ cm/s was seen. The radial propagation speed is thus a large fraction of the poloidal speed Linear theories of the drift ballooning modes in tokamaks do not predict radial propagation. Recent simulation studies have revealed nonlinearly driven radial propagation of fully developed turbulence. Signature of radial propagation has been seen in indirect measurements by Coda et al. In the figure, a typical power spectrum and radial dispersion relation observed at B = 0.7 T are shown. Studies are under way to see if magnetic fluctuations exhibit similar radial propagation.
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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 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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".