A 35 MHz spiral re-buncher cavity for the TRIUMF ISAC facility
Bibliographic record
Abstract
A full-scale prototype of a 35 MHz re-buncher cavity was built for the ISAC project at TRIUMF. The re-buncher will be operated in cw mode to maintain the beam intensity and quality. Due to the longitudinal space limitation in the beam line, a compact spiral structure was constructed and investigated to determine its parameters. Natural frequencies and vibration amplitudes were measured. Vibration amplitudes of the spiral structure with 10 liter per minute water flow are two orders of magnitude lower than the allowable values. Measurements also show that the shunt impedance of the structure is 370 k/spl Omega/ with a Q of 2740 at a resonant frequency of 39.5 MHz. MAFIA simulation predicts the resonant frequency, Q and shunt impedance to be 39.8 MHz, 5520 and 686 k/spl Omega/ respectively. Due to poor rf contacts of the prototype cavity, the measured Q is much less than that predicted by MAFIA, however, R/Q values of the prototype and simulation are 135 and 124 respectively. Construction details and final dimensions of the spiral for 35 MHz will also be presented.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.004 | 0.001 |
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".