Origin and impact of ion heating in the cathode sheath of direct-current argon discharges at moderate pressures
Bibliographic record
Abstract
In this article, we analyze the impact of ion dynamics in the sheath of argon DC plasma discharges at moderate pressures (13, 65, and 130 Pa), where the ion mean free path is smaller than the sheath width. Our analysis reveals that the evolution of the ion temperature profile plays a major role in regulating the sheath formation process, influencing plasma species density and ion fluid velocity at the cathode. Through meticulous comparison of simulation data from one-dimensional self-consistent fluid models with Particles-In-Cell 1D3V (one dimension in space and three dimensions in velocity) kinetic models, we demonstrate the necessity of considering ion-neutral collisions in fluid models to accurately simulate the glow discharge. In particular, we emphasize the necessity of self-consistent ion temperature profile calculations, particularly in the sheath region. Notably, even at moderate neutral gas pressures, the ion temperature within the cathode sheath can significantly exceed background gas temperature. Kinetic simulations demonstrate the role of ion-neutral collisions in the progressive spreading of ion velocities in directions perpendicular to the cathode sheath electric field.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| 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) | 0.000 | 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 teacher head, 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".