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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Kneisel, P. Ciovati, G. Myneni, G.R. Singer, W. Singer, X. Proch, D. Carneiro, T. |
| Copyright Year | 2005 |
| Description | Author affiliation: TJNAF, Newport News, VA 23606, USA, kneisel@jlab.org (Kneisel, P.) |
| Abstract | In a previous paper [1] we have reported about initial tests of single cell 1500 MHz cavities made from high purity niobium with three different Ta contents of 160 ppm, ∼ 600 ppm and ∼ 1400 ppm. These cavities had been treated by buffered chemical polishing several times and 100 μm, 200 μm and 300 μm of material had been removed from the surfaces. This contribution reports about subsequent tests following post purification heat treatments with Ti and “in situ” baking. As a result, all cavities exhibited increased quench fields due to the improved thermal conductivity after the heat treatment. After the “in situ” baking at 120 ° C for ∼ 40 hrs the always present Q-drop at high fields disappeared and further improvements in accelerating gradient could be realized. Gradients as high as E= 35 MV/m were achieved and there were no clear indications that the cavity performance was influenced by the Ta content in the material. A multi-cell cavity from the high Ta content material has been fabricated and initial results are reported. |
| Starting Page | 3955 |
| Ending Page | 3957 |
| File Size | 258623 |
| Page Count | 3 |
| File Format | |
| ISBN | 0780388593 |
| DOI | 10.1109/PAC.2005.1591681 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2005-05-16 |
| Publisher Place | USA |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Niobium Testing Heat treatment Thermal conductivity Chemicals Conducting materials Surface treatment Purification Thermal quenching Acceleration |
| Content Type | Text |
| Resource Type | Article |
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