Experience with the Lep Superconducting RF Accelerating System

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

Abstract

CERN is presently upgrading the large Electron Positron Collider (LEP) to higher energy by installing superconducting RF accelerating cavities. For a total installed circumferential voltage of about 2800 MV, 272 cavities operating at 352 MHz will be needed, representing an active length of 462 m and a cold surface of more than 1600 m2. The series production cavities are made out of copper, sputter-coated with a thin layer of niobium and cooled with liquid He to 4.5 K. The cavities are produced by industry and the acceptance testing is done at CERN. In 1996 176 cavities had been installed and run successfully at their design gradient of 6 MV/m during physics at a beam energy of 86 GeV. As RF power sources 36 klystrons will finally be installed with a nominal RF output power of 1 MW each. In this paper the superconducting accelerating system in LEP will be described and experience gained during operation for physics as well as new developments will be presented.

Keywords

Cavity Field Coaxial Line Power Coupler Beam Loading Large Electron Positron 
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.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    The LEP Design Report, vol. III, LEP2, C. Wyss, editor, CERN, AC/96–01, LEP2Google Scholar
  2. 2.
    G.Geschonke, S.Hansen, Status and Performance of the LEP RF System, Part. Acc. vol. 30, 779(1989)Google Scholar
  3. 3.
    M. Barranco Luque, D. Giisewell, Thermal loss analysis of cryostats and accessories for the superconducting cavities of the LEP energy upgrade, 4th EPAC, London 1994, p.2455Google Scholar
  4. 4.
    E. Chiaveri, Large scale industrial production of superconducting cavities, 5th EPAC, Sitges 1996, p. 200Google Scholar
  5. 5.
    E. Haebel, Couplers for cavities, in Proc. CAS, Hamburg 1995, CERN 96–03 (1996), p. 231Google Scholar
  6. 6.
    M. Barranco-Luque, S. Claudet, Ph. Gayet, N. Solheim, G. Winkler, Operation of the cryogenic system for superconducting cavities in LEP, proc. ICEC/ICMC, Kitakyushi, 1996Google Scholar
  7. 7.
    H. Frischholz, The LEP2 RF power generation system, Proc. IEEE PAC, Washington 1993, p. 1247\Google Scholar
  8. 8.
    D. Boussard, P. Brown, J. Tückmantel, Electroacoustic oscillations in the LEP SC cavities, 5th EPAC, Sitges (1996), p. 2097Google Scholar
  9. 9.
    Ph. Gayet, D. Kaiser, G. Winkler, Beam effects on the cryogenic system of LEP 2, this conferenceGoogle Scholar

Copyright information

© Springer Science+Business Media New York 1998

Authors and Affiliations

  • G. Geschonke
    • 1
  1. 1.SL DivisionCERNGeneva 23Switzerland

Personalised recommendations