Small scale time projection chamber setup to test the purity of liquid krypton from the NA62 experiment at CERN
Why this work is in the frame
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Bibliographic record
Abstract
Abstract A high liquid krypton purity level is essential for the NA62 calorimeter at CERN to ensure long lifetimes of the ionization electrons in the detector. A small time projection chamber (TPC) system was developed to enable the measurement of liquid krypton purity at the oxygen equivalent ppb level. This paper describes the dedicated cryogenic setup and the procedures required to operate the purity monitor system, while guaranteeing the condensation of krypton at 119 K without freezing it at 115.8 K on the cryocooler-based heat exchanger. The focus is on the materials used, and the instrumentation and pressure safety equipment that allowed the bake-out and purging procedures to reach ppb levels of impurities in the two litre vessel containing the TPC. The setup was integrated in the NA62 experimental area and successfully tested with purified commercially obtained krypton.
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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 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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