A device for selecting and rejecting X-ray harmonics in synchrotron radiation beams
Bibliographic record
Abstract
A practical device ('beam cleaner') is described that selects a specific harmonic (e.g. third order) from other nearby harmonics (e.g. fourth or fifth orders) that are transmitted by the beamline monochromator. The ability to isolate and use a clean harmonic beam effectively extends the energy range of existing beamlines. This device is a tunable medium-resolution X-ray bandpass filter, which consists of a double bent Laue crystal post-monochromator. It is a simple and inexpensive device that does not require precision goniometry and can be operated in air. The device can also be used to passively compensate for vertical beam motion as the primary beamline monochromator is scanned. Experimental results are presented that demonstrate the improvement in XAFS data quality under high harmonic conditions.
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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 | 0.001 | 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 | 0.001 |
| 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".