| Autor: |
R. Kirby, B. Harteneck, F. King, M. Benapfl, G. Millos, K. Kennedy |
| Rok vydání: |
2002 |
| Předmět: |
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| Zdroj: |
Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167). |
| DOI: |
10.1109/pac.1997.753276 |
| Popis: |
The PEP-II Low-Energy Ring will operate at a nominal energy of 3.1 GeV with a positron beam current of 2.1 A. Design parameters for vacuum components are 3.5 GeV at 3 A. The arc vacuum system is based on an aluminum antechamber concept. It consists of 192 pairs of 2 m long magnet chambers and 5.5 m long pumping chambers. Titanium nitride coating of the entire positron duct is needed in order to suppress beam instabilities caused by multipactoring and the "electron-cloud" effect. An extensive R&D program has been conducted to develop coating parameters that give proper stoichiometry and a suitable thickness of TiN. The total secondary emission yield of TiN-coated aluminum coupons has been measured after the samples were exposed to air and again after electron-beam bombardment. A coating facility has been built to cope with the large quantity of production chambers and the very tight schedule requirements. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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