Stabilizing a power amplifier feeding a high Q resonant load
Bibliographic record
Abstract
A grounded grid power amplifier for the booster cavity of the TRIUMF cyclotron, operating at 92 MHz is found to be very stable when operating into a 50 /spl Omega/ load. However, when connected to a high Q cavity via a long transmission line it can become very unstable. Even though a phase shifter (trombone) enables one to adjust the resonant frequency of the cavity to be centered between two transmission line resonances, the amplifier tends to oscillate near the operating frequency due to insufficient isolation between input and output circuits. An expensive but easy solution to such a problem is to decouple the amplifier from the cavity and transmission line by employing a circulator. However, the solution that is presented in this paper uses external feedback from anode to cathode to neutralize the internal feedback inherently present in the tube. The neutralization is adjusted such that the isolation over the amplifier's bandwidth is increased by at least 15 dB. This along with input and output resistive damping has further stabilized the amplifier, which now operates routinely with no parasitic oscillation. Results of computer simulation of the amplifier response are reported.
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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 | 0.000 | 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 | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.003 | 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".