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Design and operational experience of the superconducting third-harmonic cavity at SLS and ELETTRA.

Number: pap. n. 32

Author(s) : ANGHEL A., GEISELHART C., PORTMANN W., et al.

Summary

A big challenge of the third generation synchrotron light sources is to increase the beam lifetime. In the medium energy machines like the Swiss Light Source (SLS) at the Paul Scherrer Institute, Switzerland and ELETTRA at Sincrotrone Trieste, Italy the beam life time is dominated by the large angle intra-beam scattering. A third harmonic superconducting rf system allows to cope efficiently with this effect. By increasing the beam induced harmonic voltage, the slope of the global accelerating voltage seen by the electrons during one revolution in the storage ring is flattened and the electron bunches are lengthened therefore reducing the intra-beam scattering. In summer 2002 an idle superconducting third harmonic cavity was installed at SLS followed shortly by another one at ELETTRA. At SLS the beam lifetime was increased by a factor of three and the beam current could be increased from 150 to 400mA. This represented the first superconducting application of a high harmonic rf system in a storage ring. The superconducting cavity is cooled with liquid helium at 4.5K by a dedicated cryogenic system. During the past ten years of operation we had eliminated step-by-step all the cryogenic problems encountered with the operation of this facility such that now it operates unattended on a 12 month basis. Stable operation at 400mA is now well established as a standard for the SLS storage ring. The paper presents the cryogenic design of the superconducting harmonic cavities, the cryogenic system and the control system. The most important cryogenic operational problems encountered in the last ten years of operation are discussed and the solutions presented.

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Pages: 75-80

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Details

  • Original title: Design and operational experience of the superconducting third-harmonic cavity at SLS and ELETTRA.
  • Record ID : 30011067
  • Languages: English
  • Source: Cryogenics 2014. Proceedings of the 13th IIR International Conference: Prague, Czech Republic, April 7-11, 2014.
  • Publication date: 2014/04/07

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