Abstract

Measurement and analysis of the impact of transverse incoherent wakefields in a light source storage ring

Highlights

  • The SOLEIL storage ring is the French third generation synchrotron light source operating at the energy of 2.75 GeV

  • When an in-vacuum insertion devices (ID) is closed to its minimum gap with a high beam current, the resulting measured tune shifts are due to the incoherent wakefields, and to the intrinsic focusing arising from the magnetic field

  • We studied the incoherent wakefields arising from the passage of a high current beam in noncircular resistive-wall beam pipes experimentally and numerically for the SOLEIL storage ring

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Summary

INTRODUCTION

The SOLEIL storage ring is the French third generation synchrotron light source operating at the energy of 2.75 GeV. A high intensity beam experiences the so-called incoherent current-dependent transverse focusing due to the proximity of metallic walls of vertically reduced chambers. The difference is that its focusing strength depends linearly on the beam current, giving rise to a currentdependent betatron tune shift in the two transverse planes. For this reason, the wakefield is often called a quadrupolar wake, while it is called a monopole wake upon the fact that a monopole beam excites it. At SOLEIL, the magnitude of incoherent tune shifts arising from the chamber cross section asymmetry was estimated in multibunch and single bunch at the design phase [11].

REVIEW OF THE THEORY AND NUMERICAL EVALUATION OF INCOHERENT WAKEFIELD EFFECTS
IMPACT OF INCOHERENT FOCUSING ON NEIGHBORING BUNCHES
SHORT-RANGE INTRABUNCH CHARACTERISTICS
CONCLUSION

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