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On the coherence properties of different FEL -a simulation approach-

Mihai, Pop LU (2016) MAXM30 20161
MAX IV Laboratory
Department of Physics
Abstract
Free Electron Lasers (FEL) are one of the most brilliant light sources in the world and due to their unique properties they are used to push the frontier of knowledge in fields such as biochemistry and protein crystallography. This is the reason why there is a lot of research worldwide about understanding and improving them. Although there are numerous papers describing the output of the FEL in terms of coherence and bandwidth, it is not clear how this coherence evolves or what the factors that influence it the most are. For this reason, I propose analyzing the radiation as it is being produced, inside the undulator, with the aid of simulations. The tools developed for this analysis make use of programing and data processing software to... (More)
Free Electron Lasers (FEL) are one of the most brilliant light sources in the world and due to their unique properties they are used to push the frontier of knowledge in fields such as biochemistry and protein crystallography. This is the reason why there is a lot of research worldwide about understanding and improving them. Although there are numerous papers describing the output of the FEL in terms of coherence and bandwidth, it is not clear how this coherence evolves or what the factors that influence it the most are. For this reason, I propose analyzing the radiation as it is being produced, inside the undulator, with the aid of simulations. The tools developed for this analysis make use of programing and data processing software to recreate well known experiments used in coherence studies. These virtual tools can serve as good initial approximations for changing different parameters or designing new types of FEL, as well as improving the fundamental knowledge of the FEL process. This work uses the developed tools to characterize a particular FEL layout and extract meaningful information with respect to its coherence properties. (Less)
Popular Abstract
Electrons traveling near the speed of light emit radiation if they experience a change of trajectory.Free electron lasers (FEL) take advantage of this property to produce light from a bunch of electrons by bending their trajectories. These electrons are accelerated to relativistic speeds and forced to make sudden changes in their trajectory by a period of magnets. Scientists use this light to study phenomena happening at a microscopic scale where we can not see with the naked eye or through conventional microscopes. To get good results from the experiments it is important that a lot of photons hit the target (to have a lot of events and thus better results), and that they are evenly distributed in time and space. Free electron lasers... (More)
Electrons traveling near the speed of light emit radiation if they experience a change of trajectory.Free electron lasers (FEL) take advantage of this property to produce light from a bunch of electrons by bending their trajectories. These electrons are accelerated to relativistic speeds and forced to make sudden changes in their trajectory by a period of magnets. Scientists use this light to study phenomena happening at a microscopic scale where we can not see with the naked eye or through conventional microscopes. To get good results from the experiments it is important that a lot of photons hit the target (to have a lot of events and thus better results), and that they are evenly distributed in time and space. Free electron lasers generate a lot of photons and the way they are distributed is fairly well known. We characterize how good the photon distribution is with the help of coherence.

My project aims to determine how coherence evolves in the FEL and to find ways in which we can improve this property. My analysis is based on simulations, as it is easier to change many parameters quickly and of course, more cost effective. After I simulate the FEL, I reconstruct well known experiments for determining coherence, and use the results to observe changes in the properties of light when modifying different FEL parameters. Besides the fundamental knowledge of how coherence evolves in an FEL, this work also gives a qualitative estimation of how the coherence will change by changing certain parameters in an FEL. (Less)
Please use this url to cite or link to this publication:
author
Mihai, Pop LU
supervisor
organization
alternative title
On the coherence properties of different FEL
course
MAXM30 20161
year
type
H2 - Master's Degree (Two Years)
subject
keywords
FEL, coherence, simulations
language
English
id
8894141
date added to LUP
2016-11-04 18:05:47
date last changed
2016-11-04 18:05:47
@misc{8894141,
  abstract     = {Free Electron Lasers (FEL) are one of the most brilliant light sources in the world and due to their unique properties they are used to push the frontier of knowledge in fields such as biochemistry and protein crystallography. This is the reason why there is a lot of research worldwide about understanding and improving them. Although there are numerous papers describing the output of the FEL in terms of coherence and bandwidth, it is not clear how this coherence evolves or what the factors that influence it the most are. For this reason, I propose analyzing the radiation as it is being produced, inside the undulator, with the aid of simulations. The tools developed for this analysis make use of programing and data processing software to recreate well known experiments used in coherence studies. These virtual tools can serve as good initial approximations for changing different parameters or designing new types of FEL, as well as improving the fundamental knowledge of the FEL process. This work uses the developed tools to characterize a particular FEL layout and extract meaningful information with respect to its coherence properties.},
  author       = {Mihai, Pop},
  keyword      = {FEL,coherence,simulations},
  language     = {eng},
  note         = {Student Paper},
  title        = {On the coherence properties of different FEL -a simulation approach-},
  year         = {2016},
}