Abstract
Injection of fresh bunches into a storage ring can induce jitter in the stored bunches. For machines demanding beams of very low emittance and high stability, such as the damping rings of a future linear collider or the storage rings of a super flavor factory, this could be a potential performance limitation. We present an analysis, for the International Linear Collider (ILC) damping rings, of the transverse jitter induced on the extracted bunches from the jitter on the injected bunches, with the coupling between bunches mediated by the resistive-wall wakefield of the vacuum chamber. We find that it is important to include details of the local transverse focusing around the ring. We consider the impact of the finite thickness of the beam pipe wall, and of nonevaporable getter coating on the inside surface: in the parameter regime of the ILC damping rings, we find that the results are only slightly modified compared to an approximation to the resistive-wall wakefield based on a single-layer wall of infinite thickness. The results from our simulations indicate a tight specification on the jitter of the injected bunches.
Highlights
Beam quality and stability are central issues in storage rings and are crucial for the performance of synchrotron light sources, free electron lasers, and accelerators used for high-energy physics
The vertical beam size in the International Linear Collider (ILC) damping rings will be a few microns, and bunch-to-bunch jitter in the extracted beam must be less than 10% of the beam size
Jitter on the beam extracted from the damping rings could have an impact on the luminosity in the ILC
Summary
Beam quality and stability are central issues in storage rings and are crucial for the performance of synchrotron light sources, free electron lasers, and accelerators used for high-energy physics. While feedback systems have been developed that can suppress a range of instabilities, as beam quality improves and new schemes of operation are developed, residual effects, not completely suppressed by feedback systems, may become important This may occur, for example, in the damping rings of a future linear collider [8,9], or the storage rings of a future super flavor factory [10]. Work has previously been published on the resistive-wall wakefield in a vacuum chamber with finite wall thickness [12], and on the effects of variations of focusing strength with position around the ring [13]; and on techniques for efficient computation of wakefield effects [14] Since these issues are highly relevant for our conclusions, we include some discussion as appropriate. V we discuss the implications of our results for design and operation of the ILC damping rings
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