Carbon K-edge polarimetry with Cr/Sc multilayers
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Bibliographic record
Abstract
We investigate the polarization changes simultaneously occurring with intensity changes due to carbon contamination of optical components at two plane grating beam lines PGM 1 and PGM 2 at BESSY II. The two beam lines are very similar to each other and connect to the same APPLE II type undulator UE56 2. The spectra measured with initial horizontal and vertical polarization differ for the two beam lines. For polarimetry measurements the BESSY 8 axis polarimeter is equipped with a Cr Sc multilayer in transmission as phase retarder and a Cr Sc reflecting multilayer operating near the Brewster angle as analyzer. The polarimetry results also differ for the two beam lines. Only at PGM 2 we observe no decline of the degree of polarization within experimental errors i.e. the degree of polarization at PGM 2 is always found P gt; 0.96. We find big changes of the polarization which rapidly vary across the carbon edge. A tentative interpretation predicts the orientation of the dipoles in the contaminating carbon layers. Circular polarization is largely recovered 80 and higher at PGM 2 thru out the carbon edge by setting the undulator shift to approximately compensate the polarizing properties of the beam line
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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 | 0.001 |
| 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 it