Atomic Energy of Canada Limited
Bibliographic record
Abstract
Previous work1 on obtaining beam centroid position information using a beam excited resonant cavity with two orthogonal TMllo modes was extended to a higher harmonic cavity. The cavity operated at a frequency of 3220 MHz, the fourth harmonic of the accelerator frequency, and was fine tuned by using the frequency shift caused by varying the size of the beam hole. As predicted by beam-cavity interaction theory, the cavity output signal was shown to be proportional both to the square of the beam centroid displacement and to the square of beam current, and to be well correlated with position information obtained by self-powered y-ray detectors. A crystal and a singly balanced mixer were used to process this signal to give information of both magnitude and sign of the beam position. The cavity was used to observe the effects on beam position when slow (0.01 Hz) sinusoidal disturbances were applied to three accelerator parameters: forward power, frequency and phase. Corresponding changes in the beam position have been found. The preliminary results of an automatic beam centering control show that slow disturbances on beam position can be corrected by driving a steering magnet with the cavity signals. cavity has been designed to use electric probes instead of magnetic probes. It is tuned by dimpling the outer surface and machining the beam hole accurately. The mechanical design has, therefore, become simplified and more reliable. Beam tests with the odd-even com-bination are not possible at the present time as particles of only one polarity were available.
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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 | 0.001 | 0.002 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.003 | 0.004 |
| Science and technology studies | 0.004 | 0.001 |
| Scholarly communication | 0.003 | 0.002 |
| Open science | 0.002 | 0.003 |
| Research integrity | 0.002 | 0.002 |
| Insufficient payload (model declined to judge) | 0.549 | 0.335 |
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; the direct Gemma label and the distilled Codex classifier agree on what is shown here.
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".