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- W1556027562 abstract "The upgrade of the CERN accelerator complex has been planned in order to further increase the LHC performances in exploring new physics frontiers.One of the main limitations to the upgrade is represented by the collective instabilities. These are intensity dependent phenomena triggered by electromagnetic fields excited by the interaction of the beam with its surrounding.These fields are represented via wake fields in time domainor impedances in frequency domain.Impedances are usually studied assuming ultrarelativistic bunches while we mainly explored low and medium energy regimes in the LHC injector chain. In a non-ultrarelativistic framework we carried out a complete study of the impedance structure of the PSB which accelerates proton bunches up to 1.4 GeV. We measured the imaginary part of the impedance which creates betatron tune shift.We introduced a parabolic bunch model which together with dedicated measurementsallowed us to point to the resistive wall impedance as the source of one of the main PSB instability. These results are particularly useful for the design of efficient transverse instability dampers. We developed a macroparticle code to study the effect of the space charge on intensity dependent instabilities. Carrying out the analysis of the bunch modes we proved that the damping effects caused by the space charge, which has been modelled with semi-analytical method and using symplectic high order schemes, can increase the bunch intensity threshold.Numerical libraries have been also developed in order to study, via numerical simulationsof the bunches, the impedance of the whole CERN accelerator complex. On a different note, the experiment CNGS at CERN, requires high-intensity beams.We calculated the interpolating Hamiltonian of the beamfor highly non-linear lattices. These calculations provide the ground for theoretical and numerical studies aiming to improve the CNGS beamextraction from the PS to the SPS." @default.
- W1556027562 created "2016-06-24" @default.
- W1556027562 creator A5005195139 @default.
- W1556027562 date "2011-06-06" @default.
- W1556027562 modified "2023-09-23" @default.
- W1556027562 title "Collective effects for the LHC injectors: non-ultrarelativistic approaches" @default.
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- W1556027562 hasPublicationYear "2011" @default.
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