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

Session

Session 4

26 Sept 2019, 08:30

Zermatt, CH

Conveners

Session 4: Feedback

• Gennady Stupakov (SLAC National Accelerator Laboratory (US))

86. Active methods of suppressing longitudinal multi-bunch instabilities

Heiko Damerau (CERN)

26/09/2019, 08:30

Longitudinal multi-bunch instabilities limit the beam intensity and quality reach of hadron synchrotrons. In case the impedance source driving the instability is well known, for example an RF cavity, an active feedback can be set-up locally to reduce its effect on the beam. For multi-bunch instabilities excited by other impedances, global feedback systems are needed. A combination of both...

26. Transverse dampers with ultimate gain for suppression of instabilities in large hadron colliders

Valeri Lebedev (Fermilab)

26/09/2019, 08:55

27. The LHC transverse damper: a multi-purpose system

Daniel Valuch (CERN)

26/09/2019, 09:20

29. Implementation of transverse dampers in beam stability analyses

Kevin Shing Bruce Li (CERN)

26/09/2019, 09:45

94. Interplay of transverse damper and head-tail instability

Dr Victor Smaluk (Brookhaven National Laboratory)

26/09/2019, 10:40

Transverse head-tail instability is a major limitation of a single-bunch beam current in circular accelerators. Beam-based feedback is now a commonly used tool to suppress the instability. The feedback systems (transverse dampers) provide active suppression of the beam oscillations by electromagnetic fields, the amplitude of which is calculated in real time from the measured beam position....

31. Destabilising effect of resistive transverse dampers

Elias Metral (CERN)

26/09/2019, 11:05

78. Feedback Design for Control of the Micro-Bunching Instability based on Reinforcement Learning

Tobias Boltz (Karlsruhe Institute of Technology (KIT))

26/09/2019, 11:30

The operation of ring-based synchrotron light sources with short electron bunches increases the emission of coherent synchrotron radiation in the THz frequency range. However, the micro-bunching instability resulting from self-interaction of the bunch with its own radiation field limits stable operation with constant intensity of CSR emission to a particular threshold current. Above this...