Preliminary investigations into the evaporation process using a high brightness electron beam gun
Bibliographic record
Abstract
The high power density and net power achievable with axial electron beams make them an invaluable tool in the deposition of refractory coatings. Yet, the exact details of the coating process are often hidden behind proprietary techniques and technology. The work contained in this document involves the first examination of electron beam physical vapour deposition hardware fabricated by PAVAC Industries, Canada. The document traces the evaporation process from start to finish, examining the vacuum system, electron beam gun parameters, heat transfer and vapour transport. Experiments demonstrating the relative importance of these topics are given, as well as their inter dependencies. The conclusions drawn illustrate the transient nature of the process, which is due to the exponential temperature dependence on the evaporation rate and the moving beam spot. The main objective of this thesis is to develop some intuition into the evaporation hardware, review the over 60+ years of electron beam evaporation research and establish the tools and procedures needed for future research in this exciting field.
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 distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.002 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.000 | 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 teacher head, 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".