Experiments with a microwave plasma as a cathode for cold or hot reflex discharge ion source
Bibliographic record
Abstract
A microwave plasma cathode (MPC) was developed to replace the thermionic filaments of the cold or hot reflex discharge ion source (CHORDIS) ion source for operation with reactive gases. Experiments with our MPC showed its long lifetime and its capability of high-current electron emission. Two new types of antennae are presented. Different electron extraction apertures were used, but the best results were obtained with an extraction aperture of 6 mm in diameter. Ion beam currents for different oxygen pressures and different discharge voltages are presented and discussed. The gas pressure proved to be a critical parameter in respect to the extracted ion beam densities and beam noise. Total ion current densities of 16.8 mA/cm2 were obtained for oxygen. We are also presenting an experiment where the MPC-CHORDIS system was used as a tool to study the influence of the beam noise on the space charge compensation at the GSI Darmstadt injection beam line.
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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".