Surface analyses of electropolished niobium samples for superconducting radio frequency cavity
| Autor: | Motoaki Sawabe, T. Noguchi, Puneet Tyagi, Michiru Nishiwaki, Takayuki Saeki, Hitoshi Hayano, Shigeki Kato |
|---|---|
| Rok vydání: | 2010 |
| Předmět: | |
| Zdroj: | Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films. 28:634-638 |
| ISSN: | 1520-8559 0734-2101 |
| DOI: | 10.1116/1.3382312 |
| Popis: | The performance of superconducting radio frequency niobium cavities is sometimes limited by contaminations present on the cavity surface. In the recent years extensive research has been done to enhance the cavity performance by applying improved surface treatments such as mechanical grinding, electropolishing (EP), chemical polishing, tumbling, etc., followed by various rinsing methods such as ultrasonic pure water rinse, alcoholic rinse, high pressure water rinse, hydrogen per oxide rinse, etc. Although good cavity performance has been obtained lately by various post-EP cleaning methods, the detailed nature about the surface contaminants is still not fully characterized. Further efforts in this area are desired. Prior x-ray photoelectron spectroscopy (XPS) analyses of EPed niobium samples treated with fresh EP acid, demonstrated that the surfaces were covered mainly with the niobium oxide (Nb2O5) along with carbon, in addition a small quantity of sulfur and fluorine were also found in secondary ion mass ... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|