RF phase effect on ion transmission in TRIUMF’s ion-guide laser ion source (IG-LIS)
Bibliographic record
Abstract
A phase-locked radio frequency quadrupole (RFQ) ion-guide laser ion source (IG-LIS) has been developed and tested offline at TRIUMF's laser ion source test stand and commissioned online at the isotope separator and accelerator facility. In this device, a master clock is used to synchronize the laser pulse trigger for laser ionization and the RF driving the ion guide. The ions generated by laser pulses encounter a specific RF phase either at the moment of ionization or when entering the RFQ, which affects their transmission. The study shows that a 10%-50% improvement in ion transmission can be achieved by locking and optimizing the initial phase experienced by ions compared to the conventional IG-LIS without phase-locking. The method also provides an additional function of IG-LIS to modulate ion intensity at hundreds of kHz and to fast gate ions, which allows phase-sensitive detection and beam purification for experiments downstream.
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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) | 0.000 | 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 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".