ECLOUD10

Session

Beam Dynamics Issues

C

Oct 10, 2010, 9:30 AM

Cornell University Statler Hotel

64. Control of Transverse Intra-Bunch Instabilities using GHz Bandwidth Feedback Techniques.

Dr Claudio Rivetta (SLAC National Accelerator Laboratory)

10/10/10, 9:30 AM

Oral Sessions

Electron cloud driven instability can impose limitations on the maximum stored beam current in present and future accelerators. It drives inter-bunch and intra-bunch instabilities. Feedback control techniques have been proposed to mitigate transverse instabilities within a bunch as an extension of techniques used to control inter-bunch (coupled-bunch) instabilities. The US LHC Accelerator...

17. Numerical Modeling of E-Cloud Driven Instability and its Mitigation using a Simulated Feedback System in the CERN SPS

Jean-Luc Vay (LBNL)

10/10/10, 10:00 AM

Oral Sessions

Electron clouds impose limitations on current accelerators that may be more severe for future machines, unless adequate measures of mitigation are taken. Recently, it has been proposed to use feedback systems operating at high frequency (in the GHz range) to damp single-bunch transverse coherent oscillations that may otherwise be amplified during the interaction of the beam with ambient...

19. Simulated Performance of an FIR-Based Feedback System to Control the Electron Cloud Single-Bunch Transverse Instabilities in the CERN SPS

RAFFAELLO SECONDO (LBNL)

10/10/10, 10:30 AM

Oral Sessions

The performance of High Energy proton machines like the SPS at CERN is affected by transverse single-bunch instabilities due to the Electron Cloud effect. In a first step to model a Feedback control system to stabilize the bunch dynamics, we use a Finite Impulse Response filter to represent the processing channel. The effect of this simplified processing channel in the bunch dynamics is...

35. CesrTA EC-Induced Beam Dynamics

Gerry Dugan (Cornell University)

10/10/10, 11:30 AM

Oral Sessions

This talk will review recent data and simulation results related to electron-cloud induced beam dynamics studies at Cesr-TA.

9. xBSM bunch-by-bunch measurements in EC conditions at CesrTA

Dr John Flanagan (KEK)

10/10/10, 12:00 PM

Oral Sessions

Measurements have been made of the bunch size and position along the train in electron cloud conditions at CesrTA. Preliminary results show a bunch size blow-up starting partway down the train, with the threshold bunch position moving forward at higher bunch currents, as would be expected for electron-cloud blow-up. The bunch-by-bunch beam profile and position data, and their Fourier power...

27. Electron instability in low emittance rings, Cesr-TA and SuperKEKB

Dr kazuhito ohmi (kek)

10/10/10, 12:30 PM

Oral Sessions

We discuss single bunch instability in low emittance rings, especially focus side band appearance. Multi-bunch instability due to electron cloud in bending field is discussed.