Simulation of e-cloud driven instability and its attenuation using a simulated feedback system in the CERN SPS

Vay, J -L; Furman, M A

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DOE OSTI · 1006402

Simulation of e-cloud driven instability and its attenuation using a simulated feedback system in the CERN SPS

Vay, J -L·Furman, M A

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Abstract

Electron clouds have been shown to trigger fast growing instabilities on proton beams circulating in the SPS, and a feedback system to control the single-bunch instabilities is under active development. We present the latest improvements to the WARP-POSINST simulation framework and feedback model, and its application to the self-consistent simulations of two consecutive bunches interacting with an electron cloud in the SPS. Simulations using an idealized feedback system exhibit adequate mitigation of the instability providing that the cutoff of the feedback bandwidth is at or above 450 MHz. Artifacts from numerical noise of the injected distribution of electrons in the modeling of portions of bunch trains are discussed, and benchmarking of WARP against POSINST and HEADTAIL are presented.

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70 PLASMA PHYSICS AND FUSION TECHNOLOGY ATTENUATION CERN CLOUDS DISTRIBUTION ELECTRONS FEEDBACK INSTABILITY MITIGATION PROTON BEAMS SIMULATION

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Vay, J -L, Furman, M A. 2010-12-13. Simulation of e-cloud driven instability and its attenuation using a simulated feedback system in the CERN SPS. https://www.osti.gov/biblio/1006402

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