Designing a High-Performance Quarter Waveplate for Improved Signal Quality in X-ray Magnetic Circular Dichroism Studies at EMA Beamline
Bibliographic record
Abstract
Abstract X-ray Magnetic Circular Dichroism (XMCD) is a key technique for probing the magnetic properties of intricate materials, utilizing differences in absorption spectra of circularly polarized X-rays with opposite helicities from a magnetized sample. At the EMA beamline in Sirius, polarization control is achieved through quarter-wave plates, enabling changes in X-ray helicity at a rate of 10 Hz. This work proposes an instrumentation redesign to increase the frequency of X-ray polarization switching, optimizing the use of EMA’s high photon flux and improving XMCD signal quality. The new design aims to oscillate crystals up to 200 Hz, operate between 3 and 22 keV, follow the high dynamic double crystal monochromator fly-scan at 1 keV / s, accommodate six different crystal configurations, and maintain a vacuum level better than 10 −8 mbar. This advance is expected to significantly enhance XMCD studies, particularly for samples with very low magnetization, and advance research within the synchrotron community by providing a versatile and high-performance tool for investigating magnetic properties.
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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) | 0.001 | 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".