G. Rumolo

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This note describes the program HEADTAIL for the simulation of transverse and longitudinal single bunch phenomena, with special emphasis on the instability and emittance growth induced by an electron cloud. All input parameters as well as the standard output files are described here. The note is intended to provide potential users with the guidelines for(More)
This note describes the use of the program ECloud for the simulation of the electron cloud build up, which occurs due to photoemission, ion-ization, and secondary emission inside an accelerator beam pipe during the passage of a narrowly spaced proton or positron bunch train. All input parameters as well as the standard output files are explained. The goal(More)
PLACET[1] is a program used to simulate the dynamics, including wakefields, of a beam in the main accelerating or decelerating part of a linac. It allows for the investigation of single-and multi-bunch effects, the simulation of normal RF cavities with relatively low group velocities, as well as transfer structures specific to CLIC. Recent improvements,(More)
The term 'electron cloud' refers to an accumulation of electrons inside an accelerator beam pipe which is sufficiently strong to affect the accelerator operation, e.g., by causing beam loss, emittance growth, increase in the vacuum pressure, or degradation of the beam diagnostics. Primary electrons are generated by a number of processes. Their number can be(More)
The electron cloud (EC) can be formed in the beam pipe of a circular accelerator if the secondary emission yield (SEY) of the inner surface is larger than 1, and it can detrimentally affect the circulating beam. Understanding the underlying physics and defining the scaling laws of this effect is indispensable to steer the upgrade plans of the existing(More)
Several computer codes written at various laboratories are employed for modeling the generation and the consequences of an electron cloud. We review several of these programs, which simulate either the build up of an electron cloud or the instabilities it produces, and we compare simulation results for identical, or similar, input parameters.
1.1.1 Introduction For linear accelerators, a single bunch instability of a positron bunch due to electrons created by ionization of the residual gas was discussed in Ref. [1], where a coherent oscillation of both electrons and positrons grows from any small initial perturbation of the bunch distribution, e.g. from the statistical fluctuations due to the(More)
The SPS at high intensities exhibits transverse single-bunch instabilities with signatures consistent with an Ecloud driven instability.[1] We present recent MD data from the SPS, details of the instrument technique and spectral analysis methods which help reveal complex vertical motion that develops within a subset of the injected bunch trains. The beam(More)