Dr
Jeremy Johnson
(PSI), Mr
Sebastian Grรผbel
(PSI), Ms
Teresa Kubacka
(ETHZ)
21/11/2011, 10:30
With the advent of electromagnetic radiation sources in the range from 0.1 to 10 THz, new ways to study fundamental physics phenomena have become accessible. THz sources capable of generating MV/cm transient electric field strengths are beginning to allow the investigation of nonlinear responses, and even coherent control, in a host of materials in a way not possible with other regions of the...
Dr
Steven Johnson
(ETH Zurich)
21/11/2011, 10:35
The high peak spectral brilliance of SwissFEL will provide new opportunities to study the nonlinear interaction of x-rays with matter. for example, impulsive stimulated scattering can be used to control and manipulate coherent populations of material excitations with a flexibility not possible with nonlinear processes at optical wavelengths. This poster will discuss some of the required...
Dr
Thomas Penfold
(EPFL/PSI)
21/11/2011, 10:40
The advent of X-ray free electron lasers offers new opportunities for X-ray scattering studies of the ultrafast molecular dynamics in liquids, which was so far limited to the 100 ps resolution of synchrotrons. Photoselection induces anisotropy in the sample, which enhances the contrast of the signal from excited molecules against the diffuse background, while allowing probing of their...
Dr
Andrin Caviezel
(Paul Scherrer Institut)
21/11/2011, 10:45
X-ray diffraction is a promising tool to study the subtle interaction of the atomic lattice with the electronic degrees of freedom (long range charge, orbital and spin order) in strongly correlated electron systems. We have recently shown [1,2] that photo-induced structural phase transitions (e.g. a change of structural symmetry) in these materials can occur on time scales significantly faster...
Dr
valerie panneels
(Paul Scherrer Institute)
21/11/2011, 10:50
Membrane proteins (MPs) represent key components of cell membranes, about one fourth of the human proteome and 60% of the drug targets. We are interested in learning about the different conformations a MP can adopt in response to interacting molecules. The best way to analyse this at the atomic level is to determine their 3D-structure by crystal X-ray diffraction. We aim at producing...
Artem Rudenko
(Max Planck Advanced Study Group at CFEL)
21/11/2011, 10:55
During the last decade the rapid development of ultra-intense short-pulsed accelerator-based coherent X-ray light sources, Free-Electron Lasers (FEL), opened up a wide range of promising applications in physics, chemistry, biology and material sciences, in particular, paving the way towards imaging experiments with atomic spatial and fs temporal resolution. In order to enable these kind of...
Davide Bleiner
(Universitรคt Bern)
21/11/2011, 11:00
Newly available light sources are pushing the limit of insights thanks to short wavelength light sources. Most of these large-scale sources, such as the X-ray Free-Electron Laser as well as the Synchrotron, are operated as user-facilities, i.e. the researchers can access them on a beam-time basis, in shifts of a few hours each. Therefore, despite the superior performance of such...
Volker Roth
(Universitรคt Basel)
21/11/2011, 11:05
Prof.
Fabrizio Carbone
(EPFL)
21/11/2011, 11:10
We propose an experiment in which a beam of pulsed X-rays is combined to a pulsed electron beam in a Transmission Electron Microscope. Thanks to such an apparatus, X-ray chemically selective photo-doping of materials can be obtained while its effect can be investigated in diffraction, imaging or spectroscopy in a TEM. Recent development in pulsed electron sources allow a temporal resolution...
Christof Bรผhler
(Super Computing Systems)
21/11/2011, 11:25
Dr
Pavle Juranic
(Paul Scherrer Institut)
21/11/2011, 11:30
The SwissFEL design expects to provide users with X-ray pulses of few-femtosecond duration, which will be synchronized to a pump / probe laser. At present, no device exists to measure the relative arrival time and the X-ray pulse length with the required precision. We propose here the development of a Terahertz streak camera as photon arrival time and pulse length monitor (PALM). The efforts...
12.
Diffractive optics for focusing and characterization of hard X-ray free electron laser radiation
Petri Karvinen
(Paul Scherrer Institut)
21/11/2011, 13:00
The unique characteristics of the hard XFEL radiation impose new requirements for the focusing optics used when compared to hard synchrotron radiation. For example the heat loads caused by the extremely high photon flux quickly damage conventional optics such as Fresnel zone plates (FZPs) or diffraction gratings. Here we present results obtained using nanostructures based on diamond at Linac...
Annick Froideval
(Paul Scherrer Institute / Nuclear Energy and Safety)
21/11/2011, 13:05
The radiation tolerance of materials in nuclear reactors is an important issue for the safe operation of current and future advanced nuclear plants. During reactor operation, irradiation-induced defects can form in nuclear reactor components such as fuels, fuel claddings (Zr-alloys), and (advanced) reactor pressure vessels. The nuclear materials of concern represent steels, ceramics, composite...
Dr
Cedric Cozzo
(Paul Scherrer Institut)
21/11/2011, 13:10
In the PINE project, nuclear fuel microspheres are obtained by microwave internal gelation (MIG) [1, 2]. Free falling droplets, containing chemical ingredients (feed solution), undergo a precipitation (gelation) induced by microwave heating. The reaction is triggered by decomposing a reactant at a given temperature. However, literature suggests that microwaves could also have a nonthermal...
Dr
Andrea Caviglia
(Max Planck Research Department for Structural Dynamics, University of Hamburg)
21/11/2011, 13:20
Transition metal oxides exhibit functional electronic properties still waiting to be fully exploited in real-word applications. An important step toward the practical use of quantum materials is to achieve on-demand control of their ground state. An innovative strategy is based on the use of light pulses in the mid infrared and THz range to initiate lattice dynamics and to substantially...
Dr
Francesco Stellato
(CFEL - DESY)
21/11/2011, 13:25
We describe the possibility of performing serial femtosecond crystallography experiments at the SwissFEL X-Ray Free Electron Laser (FEL).
Single crystal X-ray diffraction snapshots can be collected from a stream of microcrystals flowing in a water jet using femtosecond pulses from a hard X-ray FEL (1).
Diffraction from ultra-short (<70 fs) pulses can be collected before significant changes...
Mr
Tim Huber
(ETH Zรผrich)
21/11/2011, 13:30
The relaxation of hot carriers through phonon interactions plays a crucial role in the physics of many highly interesting condensed matter systems, ranging from photovoltaic cells to strongly correlated systems exhibiting phenomena like superconductivity and charge density waves.
The experimental methods employed today to study phonon processes in these systems, however, either lack the time...
Dr
Steven Leake
(Paul Scherrer Institut)
21/11/2011, 13:35
Materials with nanocrystalline morphology demonstrate vastly different properties in comparison to the bulk due to the strong influence of their surfaces, interfaces and defects. Understanding the strain present in these materials is required in order to tailor devices from them with desired properties.
Bragg coherent diffractive imaging (BCDI) is a rapidly developing non-destructive...
Dr
Gaia Pigino
(Paul Scherrer Institut)
21/11/2011, 13:40
Our main focus is structural biology of eukaryotic flagella/cilia using electron cryo tomography and microscopy (cryo-EM). Cryo-EM provides images of biological macromolecules and organelles in their intact hydrated states.
The biological material in solution is spread on an EM grid and is preserved in a frozen-hydrated state by quick plunge freezing in liquid ethane at liquid nitrogen...
Jan Steinbrener
(Max-Planck-Institut fuer medizinische Forschung)
21/11/2011, 13:45
The elucidation of structures of macromolecules is an important step in the quest of understanding the chemical mechanisms underlying biological function. X-ray crystallography is a mature method that is only limited by the quality of the crystals investigated and by radiation damage. Intense, femtosecond X-ray pulses provided by X-ray free-electron lasers promise to break the nexus between...
Jaroslaw Szymczak
(Institute of Physical Chemistry, University of Basel)
21/11/2011, 13:50
