# European XFEL Users' Meeting 2016<br />DESY Photon Science Users' Meeting 2016

27-29 January 2016
DESY Hamburg
Europe/Berlin timezone

# Satellite Meetings on Tuesday, 26 January 2016(morning and/or afternoon)DESY Photon Science

DAC setup at the HED instrument of the European XFEL (Programme)
Organiser: Hanns-Peter Liermann

Over the last decade new technical developments in the field of static and dynamic diamond anvil cell (DAC) work has significantly increased the demand for very brilliant light sources to be able to conduct very fast diffraction and spectroscopy experiments. Although new detectors have made it possible to collect diffraction images at very brilliant 3rd generation sources, kHz repetition rates are at the limit of what can be achieved. A natural progression is now to conduct these demanding experiments at 4th generation sources such as the High Energy Density Instrument of the European XFEL, which holds the promise of revealing new and unprecedented understandings of the dynamics of materials.
In July 2015 the senate of the Helmholtz Association decided to fully fund the Helmholtz International Beamline for Extreme Fields (HIBEF) consortium at the HED instrument of the European XFEL. Part of this funding is reserved for the design and construction of a dedicated setup to conduct dynamic high-pressure experiments, e.g. the dynamic DAC or the double-stage DAC. During this workshop different experimental approaches and their feasibility will be presented as well as discussions of proposed pilot experiments. Finally, we will outline the technical implementation plan for 2016 - 2017 with the goal of being prepared to conduct the first experiments at the beginning of 2018.

DESY and European XFEL      new (7. Jan. 2016)

DESY/European XFEL - Turkey Workshop: Science at accelerator-based X-ray sources

Organiser: Frank Lehner (DESY)

In connection with the recently finished German-Turkish year of science, DESY and European XFEL have started an initiative to better promote the cooperation with Turkish research institutions and universities. The main goal of the workshop is to nurture further collaborations between Turkish scientists and DESY/European XFEL and to increase the usage of these novel X-ray sources in the Turkish community.
Each session (nano, surfaces, soft matter/bio) will start with a short introduction into general methodologies/techniques at lightsources. The remaining slots will be filled by the Turkish senior scientists who will briefly talk about their research, their challenges and their experimental needs.

European XFEL

From Picoseconds to Femtosecond X-Ray Experiments (FXE) (Programme)
Organiser: C. Bressler, A. Galler, W. Gawelda, D. Khakhulin, M. Rübhausen, F. Boscherini

This workshop seeks to bring together scientists interested in time-resolved X-ray experiments at both synchrotron and XFEL facilities for structural dynamics research on solids and liquids. Recent developments at Petra III now exploit the high X-ay photon flux available with a newly developed high repetition rate (up to 7.8 MHz) detection system, which will also be used at the FXE Instrument of European XFEL. The high X-ray signal quality, which can be now routinely achieved at Petra III at MHz rates, opens up new venues for studies of photophysical and photochemical processes occurring on the sub-nanosecond to sub-microsecond time scales. Some initial studies presented during the workshop point to challenging new research avenues to be pursued the next years, both at Petra III and at European XFEL, and at other local x-ray sources. A suitable laser lab infrastructure at Petra III should serve as an important ingredient for preparation of such time-resolved X-ray experiments using ultrafast optical-only tools beforehand. A discussion round about user needs for time-resolved x-ray studies at the different Hamburg light sources (Petra III, Flash, European XFEL, lab-based x-ray tools) should trigger new ideas on how to further improve the available x-ray sources for the broader scientific user community.

Sample environments for biology at XFELs (Programme)
Organisers: Joachim Schulz, Dan DePonte (SLAC) and Saša Bajt (DESY)

The satellite workshop on Sample Environments for Biology at XFELs is organized as a satellite of the 2016 European XFEL Users’ Meeting. The day before the users’ meeting, we’re inviting users with interest in biology sample environments to share their ideas and views with us. The focus this year lies on liquid jets, single particle imaging and the sample environment activities at LCLS, SACLA, SwissFEL and European XFEL. In the last session, there will be time for short contributed talks about new developments in biology sample delivery. There will be sufficient time for discussion.

Satellite Meetings on Thursday, 28 January 2016
(afternoon)

DESY Photon Science

X-ray magnetic dichroism at beamline P09 (Programme)
Organiser: Jörg Strempfer

X-ray magnetic circular dichroism (XMCD) in the hard x-ray regime, has been successfully implemented at beamline P09 at Petra III during the past years. XMCD is an element- and orbital-selective tool to investigate magnetic properties in systems with net magnetization, and provides new possibilities for the investigation of (ferri)ferromagnetically or canted AFM ordered systems at P09. In this workshop, we propose to discuss the possibilities opened by this technique and identify further needs of the user community for future experiments.

X-ray absorption spectroscopy at P64/65 - begin of user operation (Programme)
Organisers: Edmund Welter, Wolfgang Caliebe

Beamline P65 got first beam in October 2015, and the first external users performed experiments in November. The satellite workshop is intended to give an overview about the current status of both beamlines P64 and P65, and the associated project. We will discuss the experimental environment which will be available in the first half of 2016, and the options for the second half of 2016. Users, who plan to do an experiment at either P64 or P65 in the first half of 2016, or who plan to submit a proposal for the second half of 2016, are strongly encouraged to participate in this workshop and to discuss their options with the beamline staff.

DESY- 6th Workshop on X-Ray Nano-Imaging of Biological and Chemical Systems at PETRA III (Programme)
Organisers: Christian Schroer, Gerald Falkenberg

The workshop covers x-ray microscopy at PETRA III with special emphasis on applications in biology and chemistry. It is held for the 6th time as part of the activities of the Helmholtz Virtual Institute In-Situ Nano-Imaging of Biological and Chemical Processes'' and brings together scientists from biology, chemistry, and x-ray microscopy.

Serial crystallography at synchrotron sources (Programme)
Organisers: Henry Chapman, Thomas Schneider (EMBL) and Alke Meents

Serial crystallography has become a great success story at X-ray Free Electron Lasers and has recently been also successfully applied at synchrotrons sources. At these sources, the method allows structure determinations from multiple crystals which are too small for conventional diffraction experiments and has great potential for time resolved studies of enzyme reactions. It is the goal of the workshop to exchange knowledge about the latest experiments and to bring together facility staff and user groups to identify new potentials and define further needs and directions in the field of serial crystallography.

DESY- SAXS/WAXS/GISAXS-User Workshop @ DESY (Programme)
Organisers: Rainer Gehrke, Stephan Roth

This workshop addresses current and potential users of small- and wide-angle X-ray scattering at PETRA III. It is intended to present and discuss the status and perspectives of the experimental facilities, especially the Petra III micro- and nanofocus X-ray scattering beamline P03 (MiNaXS), and recent as well as planned user activities. It shall foster communication among the users and identify common interests.

P08 and P07-DESY: Diffraction with hard X-rays up to 100 keV (Programme)
Organisers: Uta Ruett, Ann-Christin Dippel und Florian Bertram

Since last year the High Resolution Diffraction Beamline P08 and the DESY endstation of the High Energy Materials Science Beamline P07-EH2 are operated jointly. P08 covers the photon energy range from 7 - 28 keV and P07 can be operated at 40 - 200 keV. In this workshop we want to discuss with users in three sessions: 1. Scattering on Surfaces and Interfaces (florian.bertram@desy.de), 2. Studies of nanostructured materials (ann-christin.dippel@desy.de) and 3. Diffraction on bulk crystals and powders (uta.ruett@desy.de). In all three topics we want to point out the capabilities and advantages of using P08 or P07.

Tutorial to X-ray Photon Correlation Spectroscopy – how to probe dynamics from 10-9 to 103 s on nanometer length scales in condensed matter (Programme)
Organisers: Michael Sprung, Felix Lehmkühler, Wojciech Roseker

The workshop will concern an introduction to X-ray Photon Correlation Spectroscopy (XPCS) with special attention on strategies how to plan, perform and analyze XPCS experiments. Science talks will cover examples of classical and state-of-the-art XPCS experiments such as (glassy) dynamics in soft matter systems, particles in fields and XPCS applications in rheology, accompanied by an overview of XPCS possibilities at beamline P10. In addition, new concepts will be discussed ranging from low-intensity XPCS at large wave vector transfers as well as possibilities of XPCS at free-electron laser facilities, in particular the European XFEL. Users that want to obtain a decent overview on the XPCS technique and plan to extent their portfolio to studying dynamics by means of XPCS are especially encouraged to join the workshop.

XFEL-Matter Interaction: Recent Advances in Theory (Programme)
Organisers: Beata Ziaja (Executive) , Sang-Kil Son, Oriol Vendrell, and Robin Santra

The workshop aims at presenting recent advances in theoretical research on
XFEL-matter interactions. Six invited experts will report on the research
highlights covering a broad spectrum of scientific interests ranging from
atomic and molecular physics through condensed matter to warm-dense-matter and
plasma research. Future outlines of development will be discussed in connection
with recent experimental achievements.

The German Engineering Materials Science Centre (GEMS): Status and perspectives of the Helmholtz-Zentrum Geesthacht Outstation at DESY (Programme)
Organiser: Martin Müller

The workshop is dedicated to materials science experiments carried out at the GEMS beamlines of PETRA III. Users are invited to present their results from P05 (imaging), P07 (high-energy diffraction and imaging) and P03 Nanofocus (nanodiffraction).

European XFEL

4th Satellite Workshop on Photon Beam Diagnostics (Programme)
Organiser: Jan Grünert

The Satellite Workshop on Photon Beam Diagnostics is organized as part of the European XFEL Users' Meeting, like in previous years. The target of this Workshop is to bring together the experts in FEL Photon Diagnostics, to strengthen existing collaborations and create new ones, to share the latest progress but also to discuss new experimental methods and instrumentation suited as FEL photon beam diagnostics. Last but not least, progress in this field at the European XFEL facility is presented, and there will be sufficient time for discussions.
This time the discussions will particularly revolve around the topic of commissioning which is approaching in 2016 for several XFEL facilities currently under construction.

Status and Science at HED instrument and of the HIBEF UC (Programme)
Organisers: Carsten Bähtz, Ulf Zastrau

The workshop on the HED instrument and the HIBEF UC is organized as a satellite of the 2016 European XFEL Users’ Meeting. We will present the current status of the HED instrument with emphasis on the expected setups and early user experiments. Further the status of the HIBEF project in general are presented and linked to the schedule of the HED installation. The recent activities in the US and at DESY are presented. Talks will give an overview of planned instrumentation and science at HED as well as recent achievements at the LCLS.

Please note: The locations of the workshops and meetings on the DESY/Bahrenfeld campus will be announced in January.