Superconducting Radio-Frequency Technology: Understanding and Improvements of Limitations Through Application of Cryogenic Instrumentation

  • P. Kneisel
Part of the Advances in Cryogenic Engineering book series (ACRE, volume 43)


A large number of diagnostic methods have been developed during the last two decades to gain insight in limiting phenomena occurring in superconducting rf cavities during operation. Temperature mapping in subcooled and superfluid helium and x -ray mapping have successfully been applied to understand and subsequently prevent or eliminate loss mechanisms present in these devices. Newer techniques specific to problems such as rf window arcing are under development.

This paper reviews various diagnostic techniques and discusses the impact of their application on progress made in SRF technology.


Temperature Mapping Cavity Wall Superfluid Helium Surface Temperature Measurement Helium Bath 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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  1. 1.
    CM. Lyneis, M. McAshan, and Nguyen Tuong Viet, Recent Measurements of S-Band and L-Band cavities at Stanford, Proc. 1972 Proton Linear Ace. Conf, 98 (Los Alamos 1972) Google Scholar
  2. 2.
    H. Piel, Diagnostic Methods of Superconducting Cavities and Identification of Phenomena, Proc. of the Workshop on RF Superconductivity, KfK Report 3019, 85 (Kernforschungszentrum Karlsruhe 19880) Google Scholar
  3. 3.
    G. Mueller, Diagnostic Techniques and Defect Classification, Proc. of 2. Workshop on RF Superconductivity, 377 (CERN 1984) Google Scholar
  4. 4.
    C. Reece, Progress in Diagnostic Techniques for SC Cavities, Proc. 3. Workshop on RF Superconductivity, Report ANL-Phy-88-l, 545 (Argonne Nat. Lab 1987) Google Scholar
  5. 5.
    H. Piel, Fundamental Features of Superconducting Cavities for High Energy Accelerators, Report WUB 86–14 (University of Wuppertal 1986) Google Scholar
  6. 6.
    H. Piel and R. Romijn, Temperature Mapping on a Superconducting Rf Cavity in Subcooled Helium, Report CERN/EF/RF 80–3 (CERN 1980) Google Scholar
  7. 7.
    G. Müller and P. Kneisel, Development of Sensitive Thermometry for Calibrated Surface Temperature Measurements of Niobium Cavities Immersed in Superfluid Helium, Report LNS SRF-851201 (Cornell Univ 1985) Google Scholar
  8. 8.
    H. Padamsee, C. Reece et al., Field Emission Studies in Superconducting Cavities, 1987 IEEE Part.Acc.Conf 1824 (Washington DC, 1987) Google Scholar
  9. 9.
    M. Fouaidy, T. Junquera and A. Caruette, Surface Temperature Measurements on Superconducting Cavities in Superfluid Helium, Proc. 5.Workshop on Rf Superconductivity, Report DESY M-92–01, 547 (DESY1991) Google Scholar
  10. 10.
    Ch. Liang,L. Phillips, and R. Sundelin, A new Method of Surface Resistance Measurement with a Niobium Triaxial Cavity working at 2K,Rev.Sci. Instr. 64(7), 1937 (1993) CrossRefGoogle Scholar
  11. 11.
    Q.S. Shu, G. Deppe et al., An Advanced Rotating T-R Mapping and its Diagnosis of TESLA 9-cell Superconducting Cavity, Proc. 1995 Part.Acc.Conf., 1639 (Dallas 1995) Google Scholar
  12. 12.
    J. Knobloch, H. Muller and H. Padamsee, Design of a High Speed,High Resolution Thermometry System for 1.5 GHz Superconducting Radio Frequency Ca vi ties,/te v. Sd Instr., 65(11) 3521 (1994) CrossRefGoogle Scholar
  13. 13.
    P. Kneisel, J. Âmato et al, Performance of Superconducting Storage Ring Cavities at 1500 Mhz, IEEE Trans.Magn. 21(2), 1000 (19850) CrossRefGoogle Scholar
  14. 14.
    C. Lyneis, Electron Loading — Description and Cures, Proc. of the Workshop on RF Superconductivity, Report KfK 3019,119 (Kernforschungszentrum Karlsruhe 1980) Google Scholar
  15. 15.
    W. Weingarten, Electron Loading, Proc.2. Workshop on RF Superconductivity, 551 (CERN 19894 Google Scholar
  16. 16.
    Q.S. Shu, W. Hartung et al, A Study of the Influence of Heat Treatment on Field Emission in Superconducting RF CaviiiQs,Nucl.Instr. and Meth. A278,329 (1989) Google Scholar
  17. 17.
    R.W. Röth, H. Heinrichs et al., Suppression of Field Emission in Superconducting S-Band Acceleration Structures, Proc. 2.Europ.Part.Acc.Conf., 1097 (Nice 1990) Google Scholar
  18. 18.
    D. Moffat, P. Barnes et al.,Studies on the Nature of Field Emission Sites, Part. Acc. 40, 59 (1992) Google Scholar
  19. 19.
    M. Pekeler, Test results on the 9-Cell 1.3 GHz Superconducting RF Cavities for the TESLA Test Facility Linac, Proc. 1997 Part.Acc.Conf.(Vancouver 1997), to be published Google Scholar
  20. 20.
    B. Bonin and R.W. Röth, Q-Degradation of Niobium Cavities Due to Hydrogen Contamination, Part.Acc40,59 (1992) Google Scholar
  21. 21.
    J. Graber, High Gradient Superconducting RF Systems,/Vöc. 1995 Part.Acc.Conf, 1478 (Dallas 1995) Google Scholar
  22. 22.
    Q.S. Shu, K. Gendreau et al.,Influence of Condensed Gases on Field Emission and Performance of Superconducting Cavities, IEEE Trans on Magnetics, 25(2), 1868 (1989) CrossRefGoogle Scholar
  23. 23.
    I. Ben-Zvi, J.F. Crawford, and J.P. Turneaure, Electron Multiplication in Cavities JEEE Trans. NS-20(3),54 (1975) Google Scholar
  24. 24.
    e.g. Sh. Noguchi, Y. Kojima, and J. Halbritter, Measurement of a Superconducting 500 MHz Nb Cavity in the TMoiO-Mode, Nucl.Instr. and Meth. 179, 205 (1981) CrossRefGoogle Scholar
  25. 25.
    RJ. Noer, Electron Field Emission from Broad Area Electrodes, Appl.Phys. A28, 1 (1982) Google Scholar
  26. 26.
    T. Junquera, S. Maissa et al.,Study of Luminous Spots Observed on Metallic Surfaces subjected to High RF Fields,Proc. 1995 Part.Acc.Conf, 1632 (Dallas 1995) Google Scholar
  27. 27.
    T. Powers, P. Kneisel, and R. Allen, Arcing Phenomena on CEBAF RF-Windows at Cryogenic Temperatures,Vöc. 1995 Part.Acc.Conf ,1645 (Dallas 1995) Google Scholar
  28. 28.
    Y. Saito, Breakdown Phenomena in Vaccum,7992 Linear Ace. Conf Proceedings Report AECL-10728,575 (Ottawa 1992) Google Scholar
  29. 29.
    M. Peiniger, Experimental Investigations on Superconducting NbßSn-Cavities at Microwave Frequencies, Report WUB-DIS 89–1 (University of Wuppertal 1989) Google Scholar

Copyright information

© Springer Science+Business Media New York 1998

Authors and Affiliations

  • P. Kneisel
    • 1
  1. 1.Thomas Jefferson National Accelerator FacilityNewport NewsUSA

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