Author :
Singer, W. ; Brinkmann, A. ; Ermakov, A. ; Iversen, J. ; Kreps, G. ; Matheisen, A. ; Proch, D. ; Reschke, D. ; Singer, X. ; Spiwek, M. ; Wen, H. ; Kneisel, P. ; Pekeler, M.
Abstract :
Several single cell and three nine-cell large grain [LG] cavities of the TESLA shape have been fabricated and tested. The best accelerating gradient of Eacc= 41 MV/m was measured on an electropolished single cell cavity. All three nine-cell cavities fulfil the XFEL specification already in first RF test after BCP surface treatment. A fabrication method of single crystal cavities of an ILC like shape was proposed. A single cell single crystal [SC] cavity reached an accelerating gradient of 37.5 MV/m after BCP treatment only. The developed method can be extended on fabrication of multi cell SC cavities.
Keywords :
accelerator RF systems; accelerator cavities; free electron lasers; BCP surface treatment; RF test; TESLA; XFEL; accelerating gradient; large grain cavities; large grain/single crystal SC resonators; multicell SC cavities; single crystal cavities; Business continuity; Crystalline materials; Fabrication; Frequency; Grain boundaries; Pollution measurement; Shape; Sheet materials; Testing; Welding;
