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MOPOW011 
Operation of Free Electron Laser FLASH Driven by Short Electron Pulses 
732 

 V. Balandin, G. Brenner, C. Gerth, N. Golubeva, U. Mavrič, H. Schlarb, E. Schneidmiller, S. Schreiber, B. Steffen, M. Yan, M.V. Yurkov
DESY, Hamburg, Germany
 E. Hass, A. Kuhl, T. Plath, M. Rehders, J. RönschSchulenburg, J. Roßbach
University of Hamburg, Institut für Experimentalphysik, Hamburg, Germany



The program of low charge mode of operation is under development at free electron laser FLASH aiming in single mode radiation pulses. A short pulse photoinjector laser has been installed at FLASH allowing production of ultrashort electron pluses with moderate compression factor of the beam formation system. Here we present pilot results of free electron laser FLASH operating at the wavelength of 13.1 nm and driven by 70 pC electron bunches. Relevant theoretical analysis has been performed showing good agreement with experimental results.


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※ DOI:10.18429/JACoWIPAC2016MOPOW011


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THPMB005 
Notes on Steffen Parameters of Extended FringeField Quadrupoles 
3226 

 V. Balandin, W. Decking, N. Golubeva
DESY, Hamburg, Germany



We consider some theoretical aspects of the Steffen hardedge model of quadrupoles with extended fringefields and discuss possibilities of usage of this model in online beam dynamics applications.


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※ DOI:10.18429/JACoWIPAC2016THPMB005


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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



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:10.18429/JACoWIPAC2016THPMB006


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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



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 ultrarelativistic 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:10.18429/JACoWIPAC2016THPMB007


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