Title :
Microscopic examination of defects located by thermometry in 1.5 GHz superconducting niobium cavities
Author :
Knobloch, J. ; Durand, R. ; Muller, H. ; Padamsee, H.
Author_Institution :
Newman Lab. of Nucl. Studies, Cornell Univ., Ithaca, NY, USA
Abstract :
A new high resolution, high speed thermometry system has been built at Cornell to permit the study of anomalous loss regions in 1.5 GHz superconducting Nb cavities in superfluid He. Following a cavity test, the cavity is dissected for examination of these regions in an electron microscope. Presented is a survey of the topographical and elemental characteristics of various defects found so far. Included are field emitters which were known to be active at the end of a cavity test, as well as those which processed
Keywords :
accelerator cavities; crystal defects; electron microscopy; niobium; superconducting cavity resonators; temperature measurement; 1.5 GHz; cavity test; defects; electron microscopy; field emitters; high resolution thermometry; superconducting Nb cavities; Dielectric losses; Heating; Helium; Iron; Magnetic fields; Niobium; Pollution measurement; Scanning electron microscopy; Signal resolution; Testing;
Conference_Titel :
Particle Accelerator Conference, 1995., Proceedings of the 1995
Conference_Location :
Dallas, TX
Print_ISBN :
0-7803-2934-1
DOI :
10.1109/PAC.1995.505307
