Improved synchrotron performance from indium antimonide crystals
Bibliographic record
Abstract
The soft x-ray micro-characterization beamline (SXRMB) has recently undergone commissioning at the Canadian Light Source. SXRMB is a synchrotron bending magnet based design that covers a photon energy range of 1.7-10 keV, using a double-crystal monochromator that employs two crystal pairs - InSb-111 and Si-111. The indium antimonide crystals are typically used over the photon energy sub-range of 1.7-4 keV, to cover the K-edges of many important elements, including Si, P, S, Cl, and Ca. The performance of the InSb-111 crystal pair has proven problematic, requiring several iterations to improve the photon flux performance to an acceptable level. Thermal distortions for indium antimonide are considerable even at power levels below 50 W, since it suffers from poor thermal conductivity and a large linear thermal expansion coefficient. Finite element analysis results for different crystal thicknesses will be presented. Improvements to the crystal cage holders and cooling, as well as metrological improvements to properly mount the crystals will also be discussed.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.005 | 0.002 |
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 source (direct Gemma or distilled Codex), 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".