A Fast Wire Scanner for the TRIUMF Electron Linac
Bibliographic record
Abstract
The superconducting CW linac presently being commissioned at TRIUMF will accelerate up to 10mA of electrons to the energy of 30 - 50 MeV. Thus, beam powers up to 0.5 MW are eventually expected. To support high beam power operation modes, a Fast Wire Scanner (FWS) capable of velocities up to 3 m/s over a 70mm range was developed. A stepper motor driven helical cam allows for a long stroke enabling two orthogonal wires to scan both axes in one scan. The radiation produced when the wires pass through the beam is detected by a BGO scintillator coupled to a photomultiplier (PMT), while wire position is measured with a precision linear potentiometer. A Struck SIS3302 VME transient recorder, synchronized to the beam pulses, simultaneously captures both signals to produce the beam profiles in the EPICS control system. The design of the FWS and initial beam measurements will 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) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.014 | 0.002 |
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".