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| Content Provider | Springer Nature Link |
|---|---|
| Author | Porcellato, A M Stark, S Y |
| Copyright Year | 2002 |
| Abstract | Eight cryostats, each housing 4 sputtered Nb/Cu, 160 MHz, quarter wave resonators (QWR), are now in operation in ALPI[1]. Two of them house high β cavities; the others are equipped with medium β resonators. Another medium β cryostat is ready and will be installed in the early 2002. Pb/Cu medium β accelerating cavities are now present only in four cryostats and they will have their Pb superconducting (SC) layer replaced by sputtered Nb soon.The substitution of the Pb SC layer in ALPI medium β resonators did not interfere with ALPI operation; the upgrading of resonators went on parallel to the cryostat maintenance programme. The average accelerating field of these resonators, at the design power of 7 W, overcomes 4 MV/m, whereas, when Pb electroplated, their average value was 2.7 MV/m. The sputtered resonator combines the good SC characteristics of Nb with the higher thermal conductivity and better stability to change of He bath pressure, which is typical of copper resonators. This leads to a very high reliability, as routinely experienced during beam acceleration. |
| Starting Page | 871 |
| Ending Page | 880 |
| Page Count | 10 |
| File Format | |
| ISSN | 03044289 |
| Journal | Pramana |
| Volume Number | 59 |
| Issue Number | 5 |
| e-ISSN | 09737111 |
| Language | English |
| Publisher | Springer India |
| Publisher Date | 2002-01-01 |
| Publisher Place | New Delhi |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Niobium superconducting cavities heavy ion LINAC Nb sputtering Physics Astronomy Astrophysics |
| Content Type | Text |
| Resource Type | Article |
| Subject | Physics and Astronomy |
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