Space charge effects in Faraday cup ion detectors
Why this work is in the frame
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Bibliographic record
Abstract
Faraday cup ion detectors are widely used in the investigation of laser-produced plasmas. However, it is well known that these detectors are susceptible to space charge distortion of the ion signal. Although an analytical model describing the threshold condition for distortion was developed in 1970 by Green, this model has never been tested experimentally. In the present investigation, it is found that the analytic model derived by Green appears to be inadequate when compared in detail to experiments performed using KrF (248 nm, 15 ns) laser pulses incident on a graphite target at an intensity of 1.7/spl times/10/sup 10/ W/cm/sup 2/. By comparing the results of particle-in-cell (PIC) simulations with these experiments, it has been discovered that electrons play an important role in the space charge distortion phenomenon.
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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 | 0.001 |
| 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