Bonn 2010 – wissenschaftliches Programm
T 78.8: Vortrag
Montag, 15. März 2010, 18:40–18:55, HG ÜR 4
The Quadrupole Resonator - A powerful tool to investigate the limits of RF superconductivity for accelerators — •Tobias Junginger1,2, Wolfgang Weingarten1, and Welsch Carsten3,4 — 1CERN, Geneva Switzerland — 2MPIK Heidelberg, Germany — 3Cockcroft Institute Warrington, United Kingdom — 4University of Liverpool, United Kingdom
The superconducting technology for niobium RF cavities (SRF) was opted for and successfully exploited in different large scale accelerator projects, such as CERN-LHC, JLAB-CEBAF, or ONL-SNS. In addition, it was selected for future projects, such as the DESY-XFEL or the ESS-Scandinavia. Even though individual niobium cavities are nowadays performing up to the believed limitations (surface magnetic induction of 200 mT and a low field surface resistance of a few nΩ), it is still unclear which surface properties yield best performance and if other materials than bulk niobium could perform even better. A convenient way to answer these questions consists in investigating small samples. They can be manufactured at a low cost and easily duplicated. For such investigations a screened four-wire-transmission-line resonator named Quadrupole Resonator had been developed at CERN and was recently refurbished. The precise calorimetric measurement technique combined with the possibility of exciting the device at several frequencies (400 MHz and 1200 MHz) enables unique tests of the RF properties of superconducting samples.