Development of ultrafast laser-plasma X-ray sources for time-resolved absorption studies in the 4-5 keV energy range
Bibliographic record
Abstract
Summary form only given. We present the progress in the optimization of laser produced plasma sources, specifically aimed the 4-5 keV X-ray energy range, using Ti and Ta wire and plane targets. Two table-top Chirped Pulse Amplification (CPA) laser systems were used: the INRS CPA laser (Nd:glass second harmonic @532 nm, 400 fs, 400 mJ, high pulse/pedestal contrast ratio, low repetition rate), and the UCSD CPA laser (Ti:sapphire @800 nm, 30 fs, 100 mJ 20 Hz repetition rate). The spectra of the emitted radiation were analyzed by the combination of a curved Si crystal spectrometer and an X-ray CCD camera arrangement. The PX-1 X-ray streak camera of INRS has also been used to follow the time history of multi-keV X-ray emission with subpicosecond temporal resolution. Comparison of the data collected with the two systems (INRS vs. UCSD) suggests the important role of the pre-pulse in achieving the maximum yield in a particular emission wavelength range. The pulse duration of the excitation pulses also has a strong effect in controlling the hot electron production processes in the rapidly expanding solid density plasma. Preliminary experiments on static absorption spectra of iodine at the L-III edge gave important data (photon statistics, signal-to-noise ratio) for designing future time-resolved EXAFS experiments based on laser produced X-ray sources.
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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) | 0.000 | 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".