bluuebunny/crossref_metadata_2025_split huggingface dataset:
Tailoring the magnetic landscape in Al-doped LaMnO3: an experimental and computational perspective
Authors: Bhowmik Tushar Kanti , Halder Saswata , Sinha Tripurari Prasad 
Published: December 2022

Abstract
We have reported the synthesis, structural and magnetic properties of LaAl
x
Mn1−x
O3 (x = 0.05, 0.15, 0.25) in this article. We have synthesized these compounds through the Sol-gel citrate method and performed the Rietveld refinement of X-ray diffraction data to determine the lattice parameters. The surface elemental composition and oxidation states of LaAl0.25Mn0.75O3 are investigated using X-ray photoelectron spectroscopy (XPS) in a wide energy window of 0–1200 eV. The magnetic study shows the ferromagnetic transition of these materials. To understand the nature of magnetization from the experiments, we have studied the first principle density functional theory (DFT) and Monte-Carlo simulation. From the DFT calculations, we have confirmed the ferromagnetic structure in the ground state and studied the electronic structure of these materials. The Monte Carlo simulation has been done through the anisotropic Ising model to analyze the origin of magnetic phase transition. We have determined the anisotropy and the interaction constants from the DFT calculations. The double exchange interaction is mainly responsible for the ferromagnetic ground state.
UVSOR Synchrotron Facility Update
Authors: Ota Hiroshi , Salehi Elham , Fujimoto Masaki , Hayashi Kenji , Horigome Toshio , Iwayama Hiroshi , Katoh Masahiro , Kondo Naonori , Makita Seiji , Matsui Fumihiko , Matsuda Hiroyuki , Mizukawa Tetsunori , Minakuchi Aki , Nakamura Eiken , Nagasaka Masanari , Okano Yasuaki , Ohigashi Takuji , Sakai Masahiro , Sugita Kento , Tanaka Kiyohisa , Taira Yoshitaka , Teshima Fumitsuna , Yamazaki Jun-ichiro , Yano Takayuki , Yuzawa Hayato , Kera Satoshi 
Published: December 2022

Abstract
UVSOR is a Japanese low-energy synchrotron light source that has been operational since 1983. It has 750 MeV electron beam energy and a circumference of 53 m. The machine has undergone two major upgrades and is now called UVSOR-III, with a moderately small emittance of 17 nm·rad and is operated in the top-up mode at 300 mA. It has six undulators. Three in-vacuum undulators provide high-brightness VUV-SX light to the beamlines BL3U, BL4U, and BL6U. BL3U and BL4U are actively used for chemistry and life sciences using in situ and operando measurements, such as soft X-ray absorption and photoelectron spectroscopy. Since 2020, a unique photoelectron analyzer called the Momentum Microscope has been in operation in BL6U. Two variable polarization undulators provide high-brightness VUV light to the beamlines, BL5U and BL7U, which are used for solid-state physics through angle- and spin-resolved photoelectron spectroscopy. BL1U is equipped with two APPLE-II undulators in tandem and is used for various research purposes, including laser Compton scattering gamma rays. In addition to these beamlines, eight beamlines are operational which use bending magnet radiation, ranging from THz to tender X-rays. In 38 years of operation, we have dealt with and properly resolved machine problems, such as water leakage from magnet coils and cooling water flow paths in ultrahigh vacuum. Considering the machine’s declining competitiveness as a light source due to its aging and emerging demands in the low-energy area, we have started a design study on the future plan, as well as discussing it closely with the user community.
Automatic online optimization on transverse emittance at SXFEL-UF injector
Authors: Zhu Zihan , Gu Duan , Gu Qiang 
Published: December 2022

Abstract
During the online tuning of a large-scale accelerator, the improvement of beam properties is usually conducted by operators manually, which is time-consuming and is highly dependent on their personal experience of it. In this work, we try to introduce the extremum seeking algorithm into the online beam transverse emittance optimization project in Shanghai soft X-ray Free-Electron Laser facility (SXFEL) Injector. The transverse emittance is essential to be well-controlled in the injector section, which facilitates the FEL lasing performance in the undulators. The experiment result demonstrates the efficiency of this automatic tuning approach and lays the foundation to further study and research on the achievement of automatic control in the free-electron laser facilities.
Simulation studies of superconducting afterburner operation for the European XFEL
Authors: Lechner C , Casalbuoni S , Geloni G , Marchetti B , Serkez S , Sinn H 
Published: December 2022

AbstractEuropean XFEL is a multi-beamline x-ray free-electron laser (FEL) user facility driven by a superconducting accelerator with a nominal photon energy range from 250 eV to 25 keV. An afterburner undulator based on superconducting undulator technology is currently being investigated to enable extension of the photon energy range towards harder x-rays. This afterburner undulator would be installed downstream of the already operating SASE2 FEL beamline, emitting at the fundamental or at a harmonic of the upstream undulator system. In this contribution we describe the layout under study and present numerical simulations.
A pre-series prototype for the superconducting undulator afterburner for the European XFEL
Authors: Casalbuoni S. , Baader J. , Geloni G. , Grattoni V. , Decking W. , La Civita D. , Lechner C. , Lilje L. , Liu S. , Marchetti B. , Potter A. , Schneidmiller E. , Serkez S. , Sinn H. , Wohlenberg T. , Zagorodnov I. 
Published: December 2022

AbstractWe 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 beamline of European XFEL. This afterburner will produce an output in the order of 1010ph/pulse at photon energies above 30 keV. The project is divided into the production of a pre-series prototype module and a small-series production of 5 modules. Central goals of this R&D activity are: the demonstration of the functionality of SCUs at an X-ray FEL, the set up of the needed infrastructure to characterize and operate SCUs, the industrialization of such undulators, and the reduction of the price per module. In this contribution, the main parameters and specifications of the pre-series prototype module are described.
Using Artificial Immune Systems to Sort and Shim Insertion Devices at Diamond Light Source
Authors: Whittle Joss , Basham Mark , Patel Zena , Rial Edward , Oates Robert , Moazzam Yousef 
Published: December 2022

Abstract
This work presents the Opt-ID software developed by the Rosalind Franklin Institute (RFI) and Diamond Light Source (DLS) in collaboration with Helmholtz-Zentrum Berlin (HZB). Opt-ID allows for efficient simulation of synchrotron Insertion Devices (ID) and the B fields produced by a given arrangement of candidate magnets. It provides an optimization framework built on the Artificial Immune System (AIS) algorithm for swapping and adjusting magnets within an ID to observe how these changes would affect the magnetic field of a real-world device, guiding ID builders in the steps they should take during ID tuning. Code for Opt-ID is provided open-source under the Apache-2.0 License on Github: https://github.com/rosalindfranklininstitute/Opt-ID
Requirements and limitations of the pulsed wire technique for measuring short-period long undulators’ magnetic field
Authors: Baader J. E. , Casalbuoni S. 
Published: December 2022

AbstractThe pulsed wire method is an attractive option to measure the magnetic field in insertion devices, mainly for those with restricted access (e.g., small gaps, in-vacuum/cryogenic environments, etc.). Besides first and second field integrals, experiments have proved the feasibility of reconstructing the magnetic field profile. Undulators with a small gap and short period are — and are planned to be — used at diffraction-limited storage rings and free-electron lasers. This contribution outlines the pulsed wire system’s requirements to perform magnetic field reconstruction in such undulators. We examine the main expected limitations, particularly the dispersive, finite pulse-width, discretization error, and sag effects. Furthermore, we present the current status of developing the pulsed wire system at the European XFEL.
Control system for a variable period undulator prototype
Authors: Vagin P , Winkler J , Bolat H , Schöps A , Tischer M 
Published: December 2022

Abstract
The magnetic structure of the proposed variable period undulator consists of cylindrical magnets. Each magnet can be rotated by a small stepper motor, in order to adjust the magnetic field and form an arbitrarily shaped magnetic field profile on-axis. Meanwhile, a short prototype exists, equipped with a scalable control system to drive a large amount of stepper motors. This paper describes details of the control system implementation, results of the tests on different rotary encoder concepts for a magnet positioning feedback, and first magnetic measurements of the variable period undulator prototype.
Recent developments to the Radia magnetostatics code for improved performance and interface
Authors: Hall C. , Abell D. , Banerjee A. , Chubar O. , Edelen J. , Keilman M. , Moeller P. , Nagler R. , Nash B. 
Published: December 2022

Abstract
Radia is a 3D magnetostatics code that is widely used to model a range of magnets for particle accelerators, with particularly broad usage within the synchrotron light source community. Recently, Radia has been released as open source and made available for collaborative development on GitHub. A US DOE SBIR grant has been obtained for its upgrade and extension. The ongoing improvements are focused on the core physics engine, performance enhancements, and the development of a graphical user interface. Additionally, a new Python API (PyRadia) has been developed to allow for wider use of Radia outside of the existing Mathematica API. We have implemented the majority of the Radia examples in Python scripts and in Jupyter notebooks, including advanced visualization features for interactively viewing 3D geometries based on the VTK toolkit. The interaction matrix and field calculations have been parallelized using MPI and show good scaling performance on a variety of cluster architectures. The parallel Radia may be accessed via Python scripts or using the Jupyter interface. A Sirepo application is under development to provide a browser based interface to the Radia code allowing modeling of synchrotron light source magnets, with a focus on undulators. Kick maps and field maps may be exported for use in electron storage ring modeling codes such as elegant or AT, and tabulated undulator files may be exported for x-ray optics computation in a physical optics code such as Synchrotron Radiation Workshop. We summarize these developments and give an outlook for future development.
A Laser Heater Undulator for FLASH2020+
Authors: Telawane S , Schöps A , Neumann P , Ramm T , Tischer M , Vagin P 
Published: December 2022

Abstract
Space charge induced micro bunch instabilities, amplified in cascaded bunch compression stages, spoil the phase space of compressed bunches and lead to unstable seeding. To “heat” up the bunch with an external laser and induce an uncorrelated energy spread to suppresses the micro bunching instabilities, a short undulator will be installed in front of the first compression chicane. The undulator has a planar hybrid magnet structure with 43 mm period length, 11 full periods, 22 mm minimum gap and a deflection parameter K of 1.52 (K = (eBλ
u
/ (2πme
c, with B - max. magnetic field amplitude, λ
u
- period length) to match the 534 nm laser wavelength at 146 MeV beam energy. The paper describes the undulator’s compact design, its control system and results of magnetic measurements and tuning.
Design of Ultrahigh Energy Resolution RIXS Beamline at NanoTerasu
Authors: Miyawaki Jun , Fujii Kentaro , Imazono Takashi , Horiba Koji , Ohtsubo Yoshiyuki , Inami Nobuhito , Nakatani Takeshi , Inaba Kento , Agui Akane , Kimura Hiroaki , Takahasi Masamitu 
Published: December 2022

Abstract
The optical design of the ultrahigh-resolution RIXS beamline, which is currently developed at NanoTerasu in Japan, is described. The main goal of this beamline is to perform ultrahigh-resolution RIXS measurements with a total energy resolution of <10 meV at 250–1000 eV with E/ΔE>150,000 for both beamline and RIXS spectrometer. To achieve the ultra-high resolution, a 2D-RIXS spectrometer using energy-dispersive X-ray is employed to compensate for lower throughput at higher energy resolution, and the optics of the beamline is optimized for the 2D-RIXS spectrometer. A vertically dispersing in-focus variable-included-angle varied-line-spacing plane grating monochromator is employed for the beamline, with an entrance slit to ensure the ultrahigh resolution. First and second mirrors focus X-ray on entrance slits vertically and horizontally, respectively, and the divergent X-ray is irradiated onto the grating. For the 2D-RIXS spectrometer, there is no exit slit, and the vertically energy-dispersed X-ray is irradiated directly onto a sample. In front of the sample, X-ray is horizontally refocused by a Wolter type-I mirror. The expected horizontal focus size at the sample is ~0.7 μm. The expected photon flux is ~1×1011 photons/s at 500–1000 eV with a virtual slit width of 2 μm required for E/ΔE>150,000. The height of the dispersed X-ray available in the 2D-RIXS spectrometer is ~120 μm, which allows the use of a remarkably high flux of ~6×1012 photons/s, and the beamline will serve as an ultrahigh-resolution and high-efficiency RIXS facility.
PAINEIRA beamline at Sirius: an automated facility for polycrystalline XRD characterization
Authors: Estrada F R , Barrett D H , Ferreira A I , Mauricio J C , Rigamonti Jr H , Meyer B C , Tolentino H C N , Westfahl Jr H , Rodella C B 
Published: December 2022

Abstract
Herein we outline the design of the Paineira beamline – a beamline dedicated to powder X-ray diffraction at the new Brazilian synchrotron source (Sirius). The optical layout optimizes the high photon brightness of the fourth-generation synchrotron light source generated by an undulator. The heavy-duty diffractometer operating in Debye-Scherrer geometry has two detector setups: a multi-analyser crystal for high-resolution and an arc-shaped area detector covering 100° in scattering angle (2θ). The beamline is optimized by carrying out high-throughput measurements with the possibility of rapid setup changes to in-situ and operando measurement conditions. Paineira beamline is under construction and will open new opportunities for materials science, catalysis, energy materials, and geoscience research with synchrotron XRD in Brazil.
Design of nano-ARPES beamline at 3-GeV next-generation synchrotron radiation facility, NanoTerasu
Authors: Horiba Koji , Imazono Takashi , Iwasawa Hideaki , Fujii Kentaro , Miyawaki Jun , Ohtsubo Yoshiyuki , Inami Nobuhito , Nakatani Takeshi , Inaba Kento , Agui Akane , Kimura Hiroaki , Takahasi Masamitu 
Published: December 2022

Abstract
The beamline for angle-resolved photoemission spectroscopy (ARPES) with a nano-focused beam (nano-ARPES) is planned as one of the public beamlines in NanoTerasu, the 3-GeV next-generation synchrotron radiation facility at Tohoku, Japan, which is scheduled to start operation in 2024. A 4 m long APPLE-II type undulator provides brilliant soft X-rays with various polarizations (linear horizontal and vertical, and left and right circular) in the energy range of 50-1,000 eV. A collimated plane grating monochromator is adopted as a soft X-ray monochromator because we can select the demagnification factor of grating cf f = cosα/cosβ between the high energy-resolution (HR) mode for HR-ARPES experiments and the low divergence mode for high-flux nano-ARPES measurements. This beamline aims to produce the high flux nano-focused beam by using ultrahigh precision reflective mirror optics, not a Fresnel zone plate used as a focusing optics in the previous nano-ARPES station at other synchrotron facilities.
An analytical approach to designing a future Nano-ARPES beamline for Diamond-II
Authors: Walters A C , Alianelli L , Wang H , Watson M D , Cacho C , Nicklin C , Sawhney K 
Published: December 2022

Abstract
Angle-resolved photoemission spectroscopy (ARPES) is a powerful method for measuring the electronic band structure of solids. Diamond Light Source is planning to build a multibend-achromat (MBA) synchrotron – Diamond-II - which will provide an almost diffraction-limited photon source in the vacuum-ultraviolet photon energy range. The improved emittance and higher coherence of MBA synchrotrons means that samples with features smaller than 1 µm can be readily studied using ARPES, provided the beamline is designed to take full advantage of the new photon source. We have developed an analytical method for optimising the optical design of a future Nano-ARPES beamline for Diamond-II. Our method enables one to explore large regions of parameter space for a beamline design in an unbiased and systematic way, with minimal requirements on computing power. We believe that the analytical method presented here will be a useful tool for synchrotron beamline designers, as it allows many beamline characteristics to be simulated quickly while working within any practical limitations.
Enhanced microprobe endstation for high-throughput and versatile sample analysis at APS 2-ID
Authors: Davis Benjamin , Antipova Olga , Preissner Curt , Bean Sunil , Holler Mirko , Mooney Tim , Kearney Steven , Lai Barry 
Published: December 2022

Abstract
The new APS-U 2-ID Microprobe instrument will provide high-throughput and versatile sample analysis capabilities and will bridge the gap to higher resolution APS-U nanoprobes. Available techniques include XRF microscopy, tomography, µXANES, µSAXS, ptychography, and laminography. A very high flux of more than 1013 photon/s is delivered across a wide range of x-ray energies from 7-20 keV. KB mirror focusing optics enable a small 50nm spot size for detailed resolution, while also providing a long working distance of 50 mm to accommodate large samples of up to 10x10 mm. The Microprobe will accommodate samples in an inert helium environment, with controlled flow of fluids, electrical biasing, and sample heating & cooling. High throughput is enabled by fast and smooth fly-scanning stages, a high-accuracy metrology system, new detectors, and upgrades in the multi-bend achromat storage ring, insertion device, 2-ID beamline, and monochromator. All these instrument upgrades will empower advancements in biological, materials and environmental sciences.
Current Status of Hard X-Ray Nano-Tomography on the Transmission Microscope at the ANATOMIX Beamline
Authors: Scheel M , Perrin J , Koch F , Daniel G , Giorgetta JL , Cauchon G , King A , Yurgens V , Le Roux V , David C , Weitkamp T 
Published: December 2022

Abstract
The transmission X-ray microscope (TXM) on the Anatomix beamline welcomed its first nano-tomography users in 2019. The instrument is based on diffractive optics and works in the range of energies from 7 keV to 21 keV. A spatial resolution in 3D volumes of better than 100 nm can be achieved. The design allows imaging samples in air, and local tomography as well as off-axis tomography scans are possible. Scans below and above K-edges can be made to access elemental distribution. The TXM serves materials science and the bio-medical field.
Recent developments at the COMET instrument of the SEXTANTS beamline at SOLEIL
Authors: Popescu Horia , Desjardins Kewin , Pinty Victor , Carcy Alexandre , Leveille Cyril , Gaudemer Roland , Sacchi Maurizio , Jaouen Nicolas 
Published: December 2022

Abstract
The COMET experimental station at SEXTANTS beamline of the SOLEIL synchrotron is dedicated to the coherent imaging of magnetic domains, using holography and ptychography, in a sample environment including magnetic fields up to 0.9 T, temperature range from 30 to 400 K and RF pumping. The 2D-detector capabilities of COMET were recently upgraded by adding to the standard CCD camera two new detectors: a high repetition rate 2D CMOS and a double delay line MCP for time resolved experiments. The three detectors can be interchanged within minutes without breaking the vacuum. The distance between an individual detector and the sample can be varied over a wide range, allowing for a trade-off between pixel size and field of view in the image reconstruction. A reconstructed pixel size of the order of 10 nm has been achieved with the new COMET setup. We report also a comparison between holographic images of magnetic domains obtained for the same sample by using the CMOS and the CCD detectors
A grazing incidence diffraction setup for Langmuir trough experiments at the high-resolution diffraction beamline P08 at PETRA III
Authors: Shen Chen , Kirchhof René , Bertram Florian 
Published: December 2022

Abstract
The Langmuir Grazing Incidence Diffraction setup at the high-resolution diffraction beamline P08 of PETRA III is a dedicated setup for grazing incidence X-ray scattering measurements on Langmuir troughs. The instrument is optimized for low background grazing incidence X-ray diffraction measurements at vapour-water interfaces, while offering rapid layer structure assessment by grazing incidence X-ray off-specular scattering, and interfacial element analysis by total reflection X-ray fluorescence spectroscopy. Its control system is intuitive and standardized to provide easy access for non-expert users, and permits automated operation except for sample exchange.
A new user-friendly materials science end station at the FinEstBeAMS beamline of MAX IV
Authors: Wang W , Kivimäki A , Chernenko K , Pärna R , Käämbre T , Kukk E , Kokko K , Valden M , Hirsimäki M , Kirm M , Huttula M 
Published: December 2022

Abstract
FinEstBeAMS is an atmospheric and materials science beamline located at the 1.5 GeV storage ring of the MAX IV Laboratory in Lund, Sweden. It offers a very wide photon energy range 4.5-1300 eV and radiation with different polarization characteristics. The beamline has three end stations installed at two branch lines. The new solid state end station (SSES) is described in this paper. It is a high-throughput apparatus with flexible sample preparation options for X-ray photoemission, angle-resolved photoemission, and X-ray absorption spectroscopy. Three examples of experiments at room temperature demonstrate the capabilities of the SSES in the research field of surface science and condensed matter physics.
Design of a soft x-ray emission spectrometer setup for soft x-ray reflectivity beamline of Indus-2
Authors: Modi Mohammed H. , Yadav P. , Gupta R.K. , Gupta Shruti 
Published: December 2022

Abstract
A soft x-ray reflectivity beamline is operational on Indus-2 synchrotron source since 2016 for reflectivity, transmission and absorption measurements in 100-1500 eV photon energy range. To perform spectroscopic experiments in 60-1000 eV spectral range a soft x-ray emission spectrometer (SXES) is designed which will serve as an additional experimental station on the beamline. The SXES setup is designed using aberration corrected varied line spacing flat filed gratings which will disperse soft x-ray emission photons on a CCD screen. Gratings of nominal line density of 1200 l/mm and 2400 l/mm are used to cover 60-250 eV and 120-1000 eV energy range respectively.
Realization of a Cost-Effective Deformable Grating for the Extreme-Ultraviolet
Authors: Samparisi F , Frassetto F , Zeni G , Vanzo A , Bonora S , Zuppella P , Poletto L 
Published: December 2022

Abstract
The application of a deformable grating to the realization of a time delay compensated monochromator is presented. The grating is realized as a replica on a thin glass substrate and the deformation is realized with a mechanical bender. The monochromator is conceived for the spectral selection of a single harmonic in the spectral range 20-80 nm in beamlines exploiting the high harmonic generation process. A possible optical design requiring only two deformable gratings, a mirror and an intermediate slit is presented.