An Overview of Collective Effects in 3rd Generation Light Sources

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Presentation transcript:

An Overview of Collective Effects in 3rd Generation Light Sources At John Adams Institute, 03 February 2011, Oxford UK R. Nagaoka, Synchrotron SOLEIL, Gif-sur-Yvette, France

Content: 1. Introduction 2. Induced EM self-field 3. Notion of Wake field 4. Geometric wake field and numerical (GdfidL) calculations 5. Impedance 6. Beam spectra 7. Equations of collective motions 8. Beam spectra overlap with impedance 9. Single bunch instabilities 10. Multibunch instabilities 11. Numerical methods of instability studies 12. Summary R. Nagaoka An Overview of Collective Effects in 3rd Generation Light Sources … At JAI, Oxford, 03 February 2011 02/26

R. Nagaoka An Overview of Collective Effects in 3rd Generation Light Sources … At JAI, Oxford, 03 February 2011 03/26

 What could be the origins of collective forces?  (Resonant) interactions with self-induced EM fields (resistive-wall/geometric/CSR) (AW Chao, “Physics of collective beam instabilities…”)  Beam-ion interaction (YH. Chin, “Experimental study of FBII at PLS”, BIW 2000) R. Nagaoka An Overview of Collective Effects in 3rd Generation Light Sources … At JAI, Oxford, 03 February 2011 04/26

 Why do they become an issue for 3rd generation light sources?  High average/bunch current aimed  Small aperture all around the ring (low gap ID sections/higher magnetic fields) 10 mm gap ID (Insertion Device) chamber at SOLEIL Vertical half aperture (standard) of some light sources  Low emittance optics and its consequence on instability Low dispersion  low a  Short bunch length  Wider spectra  Stronger interactions with high frequency wakes R. Nagaoka An Overview of Collective Effects in 3rd Generation Light Sources … At JAI, Oxford, 03 February 2011 05/26

R. Nagaoka An Overview of Collective Effects in 3rd Generation Light Sources … At JAI, Oxford, 03 February 2011 06/26

R. Nagaoka An Overview of Collective Effects in 3rd Generation Light Sources … At JAI, Oxford, 03 February 2011 07/26

(AW Chao, “Physics of collective beam instabilities…”) R. Nagaoka An Overview of Collective Effects in 3rd Generation Light Sources … At JAI, Oxford, 03 February 2011 08/26

(AW Chao, “Physics of collective beam instabilities…”) R. Nagaoka An Overview of Collective Effects in 3rd Generation Light Sources … At JAI, Oxford, 03 February 2011 09/26

(AW Chao, “Physics of collective beam instabilities…”) R. Nagaoka An Overview of Collective Effects in 3rd Generation Light Sources … At JAI, Oxford, 03 February 2011 10/26

R. Nagaoka An Overview of Collective Effects in 3rd Generation Light Sources … At JAI, Oxford, 03 February 2011 11/26

R. Nagaoka An Overview of Collective Effects in 3rd Generation Light Sources … At JAI, Oxford, 03 February 2011 12/26

(From JL Laclare’s lecture note) R. Nagaoka An Overview of Collective Effects in 3rd Generation Light Sources … At JAI, Oxford, 03 February 2011 13/26

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R. Nagaoka An Overview of Collective Effects in 3rd Generation Light Sources … At JAI, Oxford, 03 February 2011 26/26