Further development of soft X-ray scanning microscopy with an elliptical undulator at the Advanced Light Source
Bibliographic record
Abstract
LSBL-641 LBNL-52407 page 1 of 6 Further Development of Soft X-ray Scanning Microscopy with an Elliptical Undulator at the Advanced Light Source Tony Warwick a , Harald Ade b , Sirine Fakra a , Mary Gilles a , Adam Hitchcock c , David Kilcoyne b , David Shuh a and Tolek Tyliszczak a a Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA. Department of Physics, North Carolina State University, Raleigh, NC 27695, USA. c Brockhouse Inst. Mtrls. Res., McMaster University, Hamilton, ON L8S 4M1, Canada. b Soft x-ray scanning microscopy (1) is under continuing development at the Advanced Light Source. Significant progress has been made implementing new scan control systems in both operational microscopes (2) and they now operate at beam lines 5.3.2 and 11.0.2 with interferometer servo scanning and stabilization. The interferometer servo loop registers the images on a universal x/y coordinate system and locks the x-ray spot on selected features for spectro-microscopic studies. At the present time zone plates are in use with 35nm outer zone width and the imaging spatial resolution is at the diffraction limit of these lenses. Current research programs are underway in areas of polymer chemistry, environmental chemistry and materials science. A dedicated polymer STXM is in operation on a bend magnet beam line (4) and is the subject of a separate article (3) in this issue. Here we focus on the capabilities of STXM at a new beam line that employs an elliptical undulator (5) to give control of the polarization of the x-ray beam. This facility is in the process of commissioning and some results are available, other capabilities will be developed during the first half of 2003. Beam Line Capabilities Figure 1. Beamline 11.0.2 at the ALS. The monochromator is foil- wrapped at the lower left. The line branches by means of a movable mirror and each branch has its own set of exit slits. The STXM branch is seen here, with the STXM enclosure to the upper right. Figure 1 shows the beam-line. A newly engineered entrance-slit-less SX700 monochromator operates in collimated light (6,7) and serves the microscope part-time. The new monochromator has been engineered to emphasize cooling and cleanliness. The flux reduction at the carbon edge is about 30%. Much of the research on this line will involve organic molecules, studied at the C1s absorption edge.
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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 | 0.003 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.002 |
| Insufficient payload (model declined to judge) | 0.007 | 0.003 |
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".