Igor Zagorodnov
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View article: Beam dynamics optimization for a higher-brightness photo injector with various photocathode laser pulse shape
Beam dynamics optimization for a higher-brightness photo injector with various photocathode laser pulse shape Open
At PITZ, a comprehensive study is conducted to analyse the factors influencing emittance growth in the European XFEL (EuXFEL) continuous wave (CW) setup. Emittance growth due to space charge effects can be mitigated using advanced photocat…
View article: Two-bunch seeding of soft x-ray free electron lasers
Two-bunch seeding of soft x-ray free electron lasers Open
Seeded free electron lasers (FELs) demonstrate a good performance and are successfully used in different user experiments in extreme ultraviolet and soft x-ray regimes. In this paper, a simple modification of the seeding scenario is propos…
View article: Undulator linear taper control at the European X-Ray Free-Electron Laser facility
Undulator linear taper control at the European X-Ray Free-Electron Laser facility Open
Undulator tapering controls the resonance properties of the free-electron laser (FEL) amplification process. Wakefield energy losses in an undulator’s vacuum chamber are one of the factors that determine the undulator’s linear taper. While…
View article: Beam wakes for canonical chambers with anisotropic surface impedance
Beam wakes for canonical chambers with anisotropic surface impedance Open
We consider analytical expressions for beam impedance of round, rectangular, and Π-shaped waveguides with anisotropic surface impedance of arbitrary nature. The formulas are given for relativistic and nonrelativistic cases and the impedanc…
View article: Adiabatic bunch compression in storage rings from self wakes generated in Cherenkov waveguides
Adiabatic bunch compression in storage rings from self wakes generated in Cherenkov waveguides Open
Equilibrium bunch lengths typical to modern day light sources of tens of picoseconds limit the spectral reach of superradiant approaches for exploring materials and biological samples. In particular, generation of terahertz radiation seems…
View article: Short-range wakefields in an L-shaped corrugated structure
Short-range wakefields in an L-shaped corrugated structure Open
We present analytical and numerical studies of short-range wakefields in an L-shaped corrugated structure. This structure has variable streaking polarization and the quadrupole wakefield component is suppressed when the beam moves with equ…
View article: Superconducting undulator activities at the European X-ray Free-Electron Laser Facility
Superconducting undulator activities at the European X-ray Free-Electron Laser Facility Open
For more than 5 years, superconducting undulators (SCUs) have been successfully delivering X-rays in storage rings. The European X-Ray Free-Electron Laser Facility (XFEL) plans to demonstrate the operation of SCUs in X-ray free-electron la…
View article: A pre-series prototype for the superconducting undulator afterburner for the European XFEL
A pre-series prototype for the superconducting undulator afterburner for the European XFEL Open
We propose to develop, characterize and operate a superconducting undulator (SCU) afterburner consisting of 5 undulator modules (1 module = 2 SCU coils of 2 m length and 1 phase shifter) plus a pre-series prototype at the SASE2 hard X-ray …
View article: Wakefield assisted bunch compression in storage rings
Wakefield assisted bunch compression in storage rings Open
Equilibrium bunch lengths typical to modern day light sources of tens of picoseconds limit the spectral reach of superradiant approaches for exploring materials and biological samples. In particular, generation of terahertz radiation seems…
View article: Axial Representation of External Time-Dependent Electromagnetic Fields for Particle Tracking in Accelerators
Axial Representation of External Time-Dependent Electromagnetic Fields for Particle Tracking in Accelerators Open
We derive a power series representation of an arbitrary electromagnetic field near some axis through the coaxial field components on the axis. The obtained equations are compared with Fourier–Bessel series approach and verified by several …
View article: Beam Loss Study for the Implementation of Dechirper at the European XFEL
Beam Loss Study for the Implementation of Dechirper at the European XFEL Open
The European XFEL is a free-electron laser facility based on superconducting linac with high repetition rate up to 4.5 MHz. Wakefield structure (also called dechirper module) is planned to be installed in front of the SASE beam line at the…
View article: Towards a Superconducting Undulator Afterburner for the European XFEL
Towards a Superconducting Undulator Afterburner for the European XFEL Open
We propose to develop, characterize and operate a superconducting undulator (SCU) afterburner consisting of 5 undulator modules (1 module = 2 times SCU coil of 2 m length and 1 phase shifter) at the SASE2 hard X-ray beamline of European XF…
View article: Opportunities for Two-Color Experiments in the Soft X-ray Regime at the European XFEL
Opportunities for Two-Color Experiments in the Soft X-ray Regime at the European XFEL Open
X-ray pump/X-ray probe applications are made possible at X-ray Free Electron Laser (XFEL) facilities by generating two X-ray pulses with different wavelengths and controllable temporal delay. In order to enable this capability at the Europ…
View article: Beam dynamics of realistic bunches at the injector section of the European X-ray Free-Electron Laser
Beam dynamics of realistic bunches at the injector section of the European X-ray Free-Electron Laser Open
We consider a 3D electron bunch at the cathode, modelled via photoemission, with realistic (asymmetric) spatial and temporal distributions for accelerator beam dynamics studies at the European X-ray Free-Electron Laser (European XFEL). A s…
View article: Collective Effects at the Injector Section of the European X-Ray Free-Electron Laser
Collective Effects at the Injector Section of the European X-Ray Free-Electron Laser Open
We consider the collective beam dynamics at the injector section of the European XFEL. The results of the measurements for the longitudinal phase space (LPS) of the electron beam are compared with those obtained from numerical modeling. A …
View article: Model-independent tuning for maximizing free electron laser pulse energy
Model-independent tuning for maximizing free electron laser pulse energy Open
The output power of a free electron laser (FEL) has extremely high variance even when all FEL parameter set points are held constant because of the stochastic nature of the self-amplified spontaneous emission (SASE) FEL process, drift of t…
View article: Accelerator beam dynamics at the European X-ray Free Electron Laser
Accelerator beam dynamics at the European X-ray Free Electron Laser Open
We consider the collective beam dynamics in the accelerator of the European X-ray Free Electron Laser for electron bunches with charges of 250 and 500 pC. The dynamics has been studied numerically with different computer programs, and we s…
View article: Passive Ballistic Microbunching of Nonultrarelativistic Electron Bunches Using Electromagnetic Wakefields in Dielectric-Lined Waveguides
Passive Ballistic Microbunching of Nonultrarelativistic Electron Bunches Using Electromagnetic Wakefields in Dielectric-Lined Waveguides Open
Temporally modulated electron beams have a wide array of applications ranging from the generation of coherently enhanced electromagnetic radiation to the resonant excitation of electromagnetic wakefields in advanced-accelerator concepts. L…
View article: Towards an Advanced Linear International Collider
Towards an Advanced Linear International Collider Open
This document provides detailed information on the status of Advanced and Novel Accelerators techniques and describes the steps that need to be envisaged for their implementation in future accelerators, in particular for high energy physic…
View article: Two Colors at the SASE3 Line of the European XFEL: Project Scope and First Measurements
Two Colors at the SASE3 Line of the European XFEL: Project Scope and First Measurements Open
The European XFEL is a high-repetition rate facility that generates high-power SASE radiation pulses in three beamlines. A joint upgrade project, with Finnish universities, to equip the SASE3 beamline with a chicane has been recently appro…
View article: Feasibility Studies of the 100 keV Undulator Line of the European XFEL
Feasibility Studies of the 100 keV Undulator Line of the European XFEL Open
The European XFEL is a multi-user X-ray FEL facility based on superconducting linear accelerator. Presently, three undulators (SASE1, SASE2, SASE3) deliver high-brightness soft- and hard- X-ray beams for users. There are two empty undulato…
View article: First Characterization of the Photon Beam at the European XFEL in July, 2017
First Characterization of the Photon Beam at the European XFEL in July, 2017 Open
North branch of the European XFEL, SASE1, produced first light on May 3rd, 2017, and XFEL operation has been gradually improved then. First characterization of the photon beam has been performed in July / August 2017, just before an offici…
View article: Harmonic Lasing of the European XFEL in the Angstrom Regime
Harmonic Lasing of the European XFEL in the Angstrom Regime Open
Harmonic lasing in XFELs is an opportunity to extend the photon energy range of existing and planned X-ray FEL user facilities. Contrary to nonlinear harmonic generation, harmonic lasing can provide much more intense, stable, and narrow-ba…
View article: Super-X: Simulations for Extremely Hard X-Ray Generation With Short Period Superconducting Undulators for the European XFEL
Super-X: Simulations for Extremely Hard X-Ray Generation With Short Period Superconducting Undulators for the European XFEL Open
The European XFEL is a high-repetition multi-user facility with nominal photon energy range covering almost 3 orders of magnitude: 250 eV - 25 keV. In this work we explore the possibility to extend the photon energy range of the facility u…
View article: Axial Representation of External Electromagnetic Fields for Particle Tracking in Accelerators
Axial Representation of External Electromagnetic Fields for Particle Tracking in Accelerators Open
We derive a power series representation of an arbitrary electromagnetic field near some axis through the coaxial field components on the axis. The obtained equations are compared with Fourier-Bessel series approach and verified by several …
View article: Considerations for the Ultrahard X-ray Undulator Line of the European XFEL
Considerations for the Ultrahard X-ray Undulator Line of the European XFEL Open
The European XFEL is a multi-user X-ray FEL facility based on superconducting linear accelerator. Presently, three undulators (SASE1, SASE2, SASE3) routinely deliver high-brightness soft- and hard- X-ray beams for users. There are two empt…
View article: Analytical Impedance Models for Very Short Bunches
Analytical Impedance Models for Very Short Bunches Open
We discuss several analytical models for impedances of very short bunches. The approximate analytical models are compared with direct solution of Maxwell's equations.