| Paper | Title | Page |
|---|---|---|
| THPPO058 | Performance of 3-Cell Seamless Niobium Cavities | 731 |
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Performance of 3-Cell Seamless Niobium Cavities P. Kneisel, G.Ciovati, Jefferson Lab and X.Singer, W.Singer, I. Jelezov, DESY In the last several months we have surface treated and cryogenically tested three TESLA-type 3-cell cavities, which had been manufactured at DESY as seamless assemblies by hydroforming. The cavities were completed at JLab with beam tube/flange assemblies. All three cavities performed very well after they had been post-purified with titanium at 1250C for 3 hrs. The cavities, two of which consisted of an end cell and 2 center cells and one was a center cell assembly, achieved gradients of Eacc = 32 MV/m, 34 MV/m and 35 MV/m without quenches. The performance was limited by the appearance of the “Q-drop” in the absence of field emission. This contribution reports about the various measurements undertaken with these cavities. |