• Open Access

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

P. Brunelle, R. Nagaoka, and R. Sreedharan
Phys. Rev. Accel. Beams 19, 044401 – Published 15 April 2016

Abstract

The influence of incoherent wakefields arising from a high current beam circulating in a ring composed of many flat chambers on the beam is analyzed numerically and experimentally for the SOLEIL storage ring. Three distinct ranges of the excited field are studied: the long multiturn regime in multibunch fillings, the medium regime involving neighboring bunches, and the short intrabunch regime. Two theoretical models, which both take into account the field diffusion across chamber walls of finite thickness, are employed to compare the measurement with theoretical expectations. Specific experimental methods, based respectively upon orbit analysis, bunch-by-bunch transverse feedback and a single particle betatron resonance, are introduced to measure the incoherent focusing effect in the three regimes. It is found that the excited incoherent fields can be large enough to affect the ring performance. The non-negligible contribution of nonevaporable getter coating is shown to improve the agreement between measurements and calculations.

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  • Received 28 July 2015

DOI:https://doi.org/10.1103/PhysRevAccelBeams.19.044401

This article is available under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

Published by the American Physical Society

Physics Subject Headings (PhySH)

  1. Physical Systems
Accelerators & Beams

Authors & Affiliations

P. Brunelle*, R. Nagaoka, and R. Sreedharan

  • Synchrotron SOLEIL, L’Orme des Merisiers, Saint-Aubin, Gif-sur-Yvette 91192, France

  • *pascale.brunelle@synchrotron-soleil.fr

Article Text

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Issue

Vol. 19, Iss. 4 — April 2016

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