| Paper |
Title |
Page |
| THPMB005 |
Notes on Steffen Parameters of Extended Fringe-Field Quadrupoles |
3226 |
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- V. Balandin, W. Decking, N. Golubeva
DESY, Hamburg, Germany
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We consider some theoretical aspects of the Steffen hard-edge model of quadrupoles with extended fringe-fields and discuss possibilities of usage of this model in online beam dynamics applications.
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| DOI • |
reference for this paper
※ DOI:10.18429/JACoW-IPAC2016-THPMB005
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| THPMB006 |
Unclosed Lattice Dispersions as a Tool for Partial Removal of Transverse to Longitudinal Beam Correlations |
3229 |
| |
- V. Balandin, W. Decking, N. Golubeva
DESY, Hamburg, Germany
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We show how to choose unclosed lattice dispersions in order to zero either linear beam dispersions (linear correlations between energy of particles and their transverse positions and momenta) or linear beam tilts (linear correlations between longitudinal positions of particles and their transverse coordinates). Besides that, we prove that while removal of beam dispersions always leads to reduction of transverse projected emittances, zeroing of beam tilts cannot guarantee it.
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| DOI • |
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※ DOI:10.18429/JACoW-IPAC2016-THPMB006
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| THPMB007 |
Numerical Computation of Transport Matrices of Axisymmetric RF Cavities for Online Beam Dynamics Applications |
3233 |
| |
- V. Balandin, W. Decking, N. Golubeva
DESY, Hamburg, Germany
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The RF focusing effect plays a considerable role at low particle energies and cannot be neglected in many online beam dynamics applications. Unfortunately, known analytical expressions for the transfer matrix of a cavity typically are applicable only to ultra-relativistic beams and demonstrate notable differences with accurate numerical simulations at low energies. So, in this paper, we present practical numerical algorithm for calculation of the linear transfer matrices of axisymmetric RF cavities which we developed for online modeling of the beam dynamics in the European XFEL linac.
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| DOI • |
reference for this paper
※ DOI:10.18429/JACoW-IPAC2016-THPMB007
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