The effect of ion drift on the sheath, presheath, and ion-current collection for cylinders in a collisionless plasma
Why this work is in the frame
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Bibliographic record
Abstract
A calculation is presented of the behavior of the sheath and presheath surrounding an infinite cylindrical conducting object, representing a spacecraft or electrostatic probe, which is moving transversely through a collisionless plasma, such as is encountered in the ionosphere. The calculation is done by solving the coupled Vlasov (collisionless Boltzmann) and Poisson equations in an iterative manner. The results show that for some ratios of probe radius to electron Debye length, the ion current collected by the probe in a drifting plasma can be less than that collected in a nondrifting plasma. These changes in the current-collection behavior can be linked to changes that occur in the sheath and presheath with plasma drift, including at large enough drift speeds the disappearance or “collapse” of the presheath.
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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 it