3rd harmonic Landau cavity system at Max III - 16th ESLS RF Meeting

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Introduction Some information about MAX III • 3rd gen. light source, 8-fold periodicity, E = 700 MeV, α c = 0.0329 • compact due to combined function magnets, C = 36m • Tripple rf system, two passive cavities (3 rd and 5 th harmonic) 3 rd harmonic: R ss = 5.36 MΩ ; Q = 20400 5 th harmonic: R ss = 3.14 MΩ ; Q = 21700 • 3 rd harmonic cavity is a prototype for MAX IV Motivation: Why a harmonic cavity? • Causes bunch lengthening → reduces electron density in the bunch • Increases lifetime by reducing Touschek scattering • Provides “Landau damping” against beam instabilities ESLS RF meeting 2012 – Alba, Barcelona – Jonas Breunlin 2
The MAX III diagnostics beamline Visible to UV light from dipole magnet • Transverse: measure transverse beam size determine energy spread (indirectly trough dispersion) • Longitudinal: determine bunch length with OSO (Optical Sampling Oscilloscope) ESLS RF meeting 2012 – Alba, Barcelona – Jonas Breunlin 3
Page 1: The 3 rd harmonic Landau cavity in
Page 5 and 6: Landau cavity beam interaction Tota
Page 7 and 8: Example: 166mA stored current in Ma
Page 9 and 10: Comparison: bunch shapes Electron d
Page 11 and 12: Landau damping • 3 rd harmonic La
Page 13 and 14: Thank you for your attention Do you

3rd harmonic Landau cavity system at Max III - 16th ESLS RF Meeting

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