Opportunities and challenges for photon diagnostics at the soft X-ray FEL FLASH in simultaneous operation mode (Conference Presentation)

2017 ◽  
Author(s):  
Marion Kuhlmann ◽  
Rolf Treusch ◽  
Elke Plönjes-Palm ◽  
Bart Faatz ◽  
Kai Tiedtke ◽  
...  
Keyword(s):  
Operation Mode ◽  
Simultaneous Operation ◽  
X Ray

A batch-wise non-linear fitting and analysis tool for treating large X-ray diffraction data sets

2006 ◽  
Vol 39 (2) ◽  
pp. 262-266 ◽  
Author(s):  
R. J. Davies
Keyword(s):  
Diffraction Data ◽  
Operation Mode ◽  
Large Data ◽  
Scattering Data ◽  
Data Sets ◽  
Analysis Tool ◽  
Data Set ◽  
X Ray ◽  
Linear Fitting ◽  
Non Linear

Synchrotron sources offer high-brilliance X-ray beams which are ideal for spatially and time-resolved studies. Large amounts of wide- and small-angle X-ray scattering data can now be generated rapidly, for example, during routine scanning experiments. Consequently, the analysis of the large data sets produced has become a complex and pressing issue. Even relatively simple analyses become difficult when a single data set can contain many thousands of individual diffraction patterns. This article reports on a new software application for the automated analysis of scattering intensity profiles. It is capable of batch-processing thousands of individual data files without user intervention. Diffraction data can be fitted using a combination of background functions and non-linear peak functions. To compliment the batch-wise operation mode, the software includes several specialist algorithms to ensure that the results obtained are reliable. These include peak-tracking, artefact removal, function elimination and spread-estimate fitting. Furthermore, as well as non-linear fitting, the software can calculate integrated intensities and selected orientation parameters.

Diffraction studies under in situ electric field using a large-area hybrid pixel XPAD detector

2013 ◽  
Vol 46 (4) ◽  
pp. 1151-1161 ◽  
Author(s):  
Pierre Fertey ◽  
Paul Alle ◽  
Emmanuel Wenger ◽  
Bernard Dinkespiler ◽  
Olivier Cambon ◽  
...  
Keyword(s):  
Electric Field ◽  
Single Crystals ◽  
Operation Mode ◽  
Bragg Angle ◽  
Weak Electric Field ◽  
Structural Variations ◽  
Large Area ◽  
X Ray ◽  
Off Pump

A new experimental approach to perform in situ electric field diffraction on single crystals using an on-then-off pump–probe mode in situ (i.e. the field-switching method) with a synchrotron or a laboratory X-ray source is presented. Taking advantage of the fast readout of the XPAD hybrid pixel two-dimensional detector and its programmable functionalities, the operation mode of the detector has been customized to significantly increase the efficiency of the method. The very weak electric field-induced structural response of a piezoelectric crystal can be accurately measured. This allows the piezoelectric tensor to be precisely obtained from Δθ shifts while the structural variations can be modelled using a full set of ΔI/I data. The experimental method and methodology are detailed and tested as a case study on pure piezoelectric compounds belonging to the α-quartz family (SiO2 and GaAsO4 single crystals). Using the two scan modes developed, it is demonstrated that tiny Bragg angle shifts can be measured as well as small field-induced Bragg intensity variations (<1%). The relevance of measurements performed with an X-ray laboratory source is demonstrated: partial data sets collected at synchrotrons can be completed, but more interestingly, a large part of the study can now be realized in the laboratory (medium to strong intensity reflections) in a comparable data collection time.

scholarly journals Timepix3 detector network for nuclear waste monitoring

2021 ◽  
Vol 253 ◽  
pp. 07010
Author(s):  
Bartolomej Biskup ◽  
Benedikt Bergmann ◽  
Pavel Broulim ◽  
Petr Burian ◽  
Milan Malich ◽  
...  
Keyword(s):  
Nuclear Waste ◽  
Detection Efficiency ◽  
Energy Calibration ◽  
Fast Neutrons ◽  
Particle Type ◽  
Simultaneous Operation ◽  
Particle Detectors ◽  
X Ray ◽  
Timing Information

In the framework of the MICADO project we proposed an active long-term nuclear waste monitoring system based on Timepix3 technology. Particle detectors based on Timepix3 are capable of particle type discrimination and provide spectrometric information in combination with precise timing information. To maximize the versatility of the setup, the Timepix3 detectors employed are equipped with a range of different sensors. To enable measurement of neutrons, two quadrants of the detectors are covered by neutron converters, allowing detection of thermal neutron by capture in 6Li, as well as detection of fast neutrons through recoil protons generated in a polyethylene converter. Within this project a new housing for the detector unit and the readout was developed, with the network currently comprising of 9 such detectors. A specifically developed in-house software handles simultaneous operation of all devices, cluster analysis and data visualization. Energy calibration was performed using an X-ray tube with several fluorescence foils as well as photons from an 241Am source. The neutron and gamma/X-ray detection efficiency calibration was carried out at the Czech Metrology Institute and the results are presented here. Tests on simultaneous operation of all 9 devices were performed using uraninite and 241Am sources.

scholarly journals SLS-2 – the upgrade of the Swiss Light Source

2018 ◽  
Vol 25 (3) ◽  
pp. 631-641 ◽  
Author(s):  
Andreas Streun ◽  
Terence Garvey ◽  
Lenny Rivkin ◽  
Volker Schlott ◽  
Thomas Schmidt ◽  
...  
Keyword(s):  
Light Source ◽  
Photoelectron Spectroscopy ◽  
Operation Mode ◽  
The Novel ◽  
Coherent Imaging ◽  
Full Field ◽  
X Ray ◽  
Lattice Design ◽  
X Ray Scattering ◽  
Swiss Light Source

An upgrade of the Swiss Light Source (SLS) is planned for 2021–2024 and includes the exchange of the existing storage ring by a new one providing about 40–50 times lower emittance in user operation mode. This will extend the performance of SLS in particular in the fields of coherent imaging, full-field tomography, soft X-ray angle-resolved photoelectron spectroscopy and resonant inelastic X-ray scattering. A science case and a conceptual design for the machine have been established. As a summary of these reports, the novel lattice design, undulator developments and scientific highlights are presented.

Single-shot arrival timing diagnostics for a soft X-ray free-electron laser beamline at SACLA

2018 ◽  
Vol 25 (1) ◽  
pp. 68-71 ◽  
Author(s):  
Shigeki Owada ◽  
Kyo Nakajima ◽  
Tadashi Togashi ◽  
Tetsuo Kayatama ◽  
Makina Yabashi
Keyword(s):  
Free Electron ◽  
Free Electron Laser ◽  
Imaging System ◽  
Laser Pulses ◽  
Single Shot ◽  
Simultaneous Operation ◽  
One Dimensional ◽  
X Ray ◽  
Arrival Timing ◽  
Optical Laser

Arrival timing diagnostics performed at a soft X-ray free-electron laser (FEL) beamline of SACLA are described. Intense soft X-ray FEL pulses with one-dimensional focusing efficiently induce transient changes of optical reflectivity on the surface of GaAs. The arrival timing between soft X-ray FEL and optical laser pulses was successfully measured as a spatial position of the reflectivity change. The temporal resolution evaluated from the imaging system reaches ∼10 fs. This method requires only a small portion of the incident pulse energy, which enables the simultaneous operation of the arrival timing diagnostics and experiments by introducing a wavefront-splitting scheme.

scholarly journals All-diamond optical assemblies for a beam-multiplexing X-ray monochromator at the Linac Coherent Light Source

2014 ◽  
Vol 47 (4) ◽  
pp. 1329-1336 ◽  
Author(s):  
S. Stoupin ◽  
S. A. Terentyev ◽  
V. D. Blank ◽  
Yu. V. Shvyd'ko ◽  
K. Goetze ◽  
...  
Keyword(s):  
Light Source ◽  
Coherent Light ◽  
Rigid Substrate ◽  
Simultaneous Operation ◽  
Double Crystal ◽  
X Ray ◽  
Monochromator Crystal ◽  
Linac Coherent Light Source ◽  
Coherent Light Source

A double-crystal diamond (111) monochromator recently implemented at the Linac Coherent Light Source (LCLS) enables splitting of the primary X-ray beam into a pink (transmitted) and a monochromatic (reflected) branch. The first monochromator crystal, with a thickness of ∼100 µm, provides sufficient X-ray transmittance to enable simultaneous operation of two beamlines. This article reports the design, fabrication and X-ray characterization of the first and second (300 µm-thick) crystals utilized in the monochromator and the optical assemblies holding these crystals. Each crystal plate has a region of about 5 × 2 mm with low defect concentration, sufficient for use in X-ray optics at the LCLS. The optical assemblies holding the crystals were designed to provide mounting on a rigid substrate and to minimize mounting-induced crystal strain. The induced strain was evaluated using double-crystal X-ray topography and was found to be small over the 5 × 2 mm working regions of the crystals.

scholarly journals Simultaneous operation of two soft x-ray free-electron lasers driven by one linear accelerator

2016 ◽  
Vol 18 (6) ◽  
pp. 062002 ◽  
Author(s):  
B Faatz ◽  
E Plönjes ◽  
S Ackermann ◽  
A Agababyan ◽  
V Asgekar ◽  
...  
Keyword(s):  
Free Electron ◽  
Linear Accelerator ◽  
Free Electron Lasers ◽  
Simultaneous Operation ◽  
X Ray

Compact undulator line for a high-brilliance soft-X-ray free-electron laser at MAX IV

2019 ◽  
Vol 26 (3) ◽  
pp. 891-898
Author(s):  
Alan Mak ◽  
Peter Salén ◽  
Vitaliy Goryashko
Keyword(s):  
Parameter Space ◽  
Free Electron ◽  
Free Electron Laser ◽  
Optimal Parameter ◽  
Operation Mode ◽  
The Self ◽  
X Ray ◽  
Short Period ◽  
Recent Developments ◽  
Output Characteristics

The optimal parameter space for an X-ray free-electron laser (FEL) in the self-amplified spontaneous emission (SASE) operation mode is examined. This study focuses on FEL operation with a shorter undulator period and higher undulator strength made available through recent developments in in-vacuum, cryogenic and superconducting undulators. Progress on short-period undulator technologies is surveyed and FEL output characteristics versus undulator parameters are computed. The study is performed on a case of the planned soft-X-ray FEL at the MAX IV Laboratory in Sweden. An extension of the SASE mode into the harmonic lasing self-seeded mode is also analysed.

scholarly journals Pulse intensity characterization of the LCLS nanosecond double-bunch mode of operation

2018 ◽  
Vol 25 (3) ◽  
pp. 642-649 ◽  
Author(s):  
Yanwen Sun ◽  
Franz-Josef Decker ◽  
James Turner ◽  
Sanghoon Song ◽  
Aymeric Robert ◽  
...  
Keyword(s):  
Operation Mode ◽  
Ultrafast Dynamics ◽  
Full Potential ◽  
Single Shot ◽  
X Ray ◽  
Pulse Intensity ◽  
Mode Of Operation ◽  
Recent Demonstration ◽  
Better Than

The recent demonstration of the `nanosecond double-bunch' operation mode,i.e.two X-ray pulses separated in time between 0.35 and hundreds of nanoseconds and by increments of 0.35 ns, offers new opportunities to investigate ultrafast dynamics in diverse systems of interest. However, in order to reach its full potential, this mode of operation requires the precise characterization of the intensity of each X-ray pulse within each pulse pair for any time separation. Here, a transmissive single-shot diagnostic that achieves this goal for time separations larger than 0.7 ns with a precision better than 5% is presented. It also provides real-time monitoring feedback to help tune the accelerator parameters to deliver double pulse intensity distributions optimized for specific experimental goals.

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