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
Summary
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].
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