Perturbation of the periodic dispersion under beam crossing optics in LHC

Beam crossing and separation schemes in the LHC interaction regions impose non-zero closed orbit in the low-beta triplets. The related perturbative dispersion is derived; propagation, multicrossing interference, perturbative effects around the ring are investigated and quantified. Horizontal and vertical compensation schemes are presented

Time integration in the code Zgoubi and external usage of PTC's structures

The purpose of this note is to describe Zgoubi's integrator and to describe some pitfals for time based integration when used in accelerators. We show why the convergence rate of an integrator can be affected by an improper treatment at the boundary when time is used as the integration variable. We also point out how the code PTC can be used as a container by other tracking engine. This work is not completed as far as incorporation of Zgoubi is concerned

NuFact muon storage ring : study of a triangle design based on solenoid focusing decay straights

Properties of acceptance and beam transmission in a triangle design of the neutrino factory muon decay ring, with decay straights based on solenoidal focusing, are reported

Projet de hadrontherapie a Lyon - Revue de l'injection dans PIMMS et variantes: protons de 7 MeV, injection exterieure

Ce rapport passe en revue certaines etudes concernant l'injection dans le synchrotron, realisees sur la base du document PIMMS du Cern, dans le cadre et en tenant compte des specificites du projet de hadrontherapie Rhones-Alpes. Deux variantes sont aussi presentees, injection de protons de 7 MeV et injection par l'exterieur de l'anneau

Projet de hadrontherapie a Lyon - Lignes de faisceau

Ce rapport decrit les lignes de faisceau du projet de hadrontherapie Rhone-Alpes, depuis la region d'extraction dans le synchrotron jusqu'aux chambres d'irradiation

Setting up tracking tools for NuFact bowtie decay ring studies

This paper describes the setting up of ray-tracing tools, and preliminary beam dynamics studies concerning the NuFact bowtie decay ring

Spiral FFAG lattice design tools - Application to 6-D tracking

Ray-tracing based methods for 3-D modeling of magnetic field and particle motion in spiral scaling FFAG accelerators have been developed. They allow efficient simulation of particle motion in presence of the strong field non-linearities proper to FFAG magnets, and of possible field overlapping in configurations of neighboring magnets, thus yielding a performing tool for spiral FFAG lattice design and optimizations, and for 6-D tracking studies. It is applied for illustration to a principle design of a 200 MeV medical class proton FFAG now under study in the frame of the RACCAM hadrontherapy project