Giovanni Rumolo

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  • G Rumolo, F Zimmermann, Switzerland Geneva
  • 2002
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)
Most of present intelligent knowledge management environments for conceptual modelling and analysis suuer, in our opinion, from mixing two representation levels: (1) a conceptual level, where domain-speciic concepts are represented (e.g., data and processes in Data-Flow Diagrams); (2) an epistemological level, where inferences are drawn from(More)
This paper describes an analyst-oriented approach to conceptual knowledge representation and reasoning based on description logics. The approach is introduced to model and analyse the static part of behavioural concepts used in application domains. Behaviours are captured in a parametric way with respect to the description logic which corresponds to the(More)
  • G Rumolo, F Zimmermann, Switzerland Geneva
  • 2002
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)
  • A Latina, H Burkhardt, P Eliasson, L Neukermans, J Resta-López, G Rumolo +2 others
  • 2006
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)
  • F Zimmermann, G Rumolo, Gsi, K Germany, Ohmi, Japan Kek
  • 2004
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)
A quasi-stationary electron cloud can drive single-bunch instabilities on a circulating beam through a head-tail coupling mechanism. The oscillation frequency of the electrons in the transverse field of the bunch, and how it can be expressed as a function of the bunch properties, is essential for the understanding of this instability. The process of the(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)
  • E Benedetto, F Ruggiero, D Schulte, F Zimmermann, M Blaskiewicz, L Wang +15 others
  • 2004
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.
  • G Rumolo, E Benedetto, U Iriso, F Zimmermann
  • 2004
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)