A pulse sequencer for the KAON factory beam chopper
Bibliographic record
Abstract
The beam chopper consists of a low-loss transmission line center fed from a tetrode. The transmission line is terminated with a short-circuit at one end and an open-circuit deflector plate at the other end. The complex reflections from the open-circuited and short-circuited ends allow a single tetrode to generate a deflector pulse with good rise and fall times. The shape of the pulse at the deflector plate is extremely sensitive to the frequency of the grid driver pulse. A variation of 1 ns in timing significantly alters the deflector pulse. To provide the required pulse pattern, a FET based grid pulser and sequencer has been built. This sequencer is able to produce alternating narrow and wide 900 volt grid pulses with rise and fall times of 20 ns. Under computer supervision it is able to generate and control pulse patterns with a stability of /spl plusmn/125 ps. The pulse pattern is synchronized to an RF synthesizer to simulate operation with the 23 MHz TRIUMF cyclotron RF system. >
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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 | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.045 | 0.013 |
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".