ICFA mini-Workshop on "Mitigation of Coherent Beam Instabilities in particle accelerators" MCBI 2019

Session

Session 3

24 Sept 2019, 16:00

Zermatt, CH

Conveners

Session 3: Optics and RF knobs

• Elena Shaposhnikova (CERN)

18. Mitigation of collective effects (coherent beam instabilities) by optics optimization

Yannis Papaphilippou (CERN)

24/09/2019, 16:30

19. Control of linear coupling to avoid loss of Landau damping

Lee Carver (ESRF)

24/09/2019, 16:50

20. Coping with longitudinal instabilities using controlled longitudinal emittance blow- up

Helga Timko (CERN)

24/09/2019, 17:10

21. Passive higher-harmonic RF cavities with general settings and multi-bunch instabilities in electron storage rings

Marco Venturini (LBNL)

24/09/2019, 17:30

92. Suppression of the Fast Beam-Ion Instability by Tune Spread in the Electron Beam due to Beam-Beam Effects

Gennady Stupakov (SLAC National Accelerator Laboratory (US))

24/09/2019, 17:50

The fast beam-ion instability (FII) is caused by the interaction of an electron bunch train with the residual gas ions. The ion oscillations in the potential well of the electron beam have an inherent frequency spread due to the nonlinear profile of the potential. However, this frequency spread and associated with it Landau damping typically is not strong enough to suppress the instability. In...

22. Beam loading compensation for optimal bunch lengthening with harmonic cavities

Naoto Yamamoto (KEK)

24/09/2019, 18:30

70. Suppression of the longitudinal coupled bunch instability in DAFNE in collisions with a crossing angle

Alessandro Drago (INFN)

24/09/2019, 18:50

In DAFNE, the Frascati e+/e- collider operating since 1998, an innovative collision scheme, the crab waist, has been successfully implemented during the years 2008-09. During operations for the Siddharta experiment an unusual synchrotron oscillation damping effect induced by beam-beam collisions has been observed. Indeed, when the longitudinal feedback is off, the positron beam becomes...

24. RF scheme to mitigate longitudinal instabilities in Super Proton-Proton Collider

Linhao Zhang (IHEP)

24/09/2019, 19:10

88. Mitigation of Space Charge Effects Using Electron Column at IOTA Ring

Prof. Chong Shik Park (Korea University)

24/09/2019, 19:30

We investigate a novel method to mitigate space charge effects of high intensity proton beams propagating in circular accelerators by means of trapping and controlling electrons generated from beam-induced residual gas ionization. This compensation method uses Coulomb repulsion force between a proton beam and electrons to mitigate self-space charge effects of the beam if it passes through a...