A5000682421- Advanced X-ray Imaging Techniques
- Particle Accelerators and Free-Electron Lasers
- X-ray Spectroscopy and Fluorescence Analysis
- Adaptive optics and wavefront sensing
- Electron and X-Ray Spectroscopy Techniques
- Advancements in Photolithography Techniques
- Advanced Electron Microscopy Techniques and Applications
- Advanced Measurement and Metrology Techniques
- Advanced Chemical Physics Studies
- Laser-Plasma Interactions and Diagnostics
- Optical Systems and Laser Technology
- Optical measurement and interference techniques
- Surface and Thin Film Phenomena
- Crystallography and Radiation Phenomena
- Advanced Surface Polishing Techniques
- Particle accelerators and beam dynamics
- Solar Thermal and Photovoltaic Systems
- Advanced X-ray and CT Imaging
- Catalytic Processes in Materials Science
- Surface Roughness and Optical Measurements
- Intellectual Property Law
- Scientific Computing and Data Management
- Medical Imaging Techniques and Applications
- Copper Interconnects and Reliability
- Gas Sensing Nanomaterials and Sensors
Lawrence Berkeley National Laboratory
2019-2023
SLAC National Accelerator Laboratory
2012-2022
Menlo School
2018
Heinz Optical Engineering (United States)
2016
Stanford University
2015
Elettra-Sincrotrone Trieste S.C.p.A.
2002-2012
AREA Science Park
1998-2009
Synchrotron soleil
2008
Carl Zeiss (Germany)
2007
Instituto de Ciencia de Materiales de Madrid
1997-1998
FERMI@Elettra comprises two free electron lasers (FELs) that will generate short pulses (τ∼25–200 fs) of highly coherent radiation in the XUV and soft x-ray region. The use external laser seeding together with a harmonic upshift scheme to obtain wavelengths give capability producing high-quality, longitudinally photon pulses. This capability, possibilities temporal synchronization control output polarization, open up new experimental opportunities are not possible currently available FELs....
The Linac Coherent Light Source has added a self-seeding capability to the soft x-ray range using grating monochromator system. We report demonstration of with measured resolving power 2000--5000, wavelength stability ${10}^{\ensuremath{-}4}$, and an increase in peak brightness by factor 2--5 across photon energy 500--1000 eV. By avoiding need for at experimental station, self-seeded beam can deliver as much 50-fold higher users.
The optical design of the BOREAS beamline operating at ALBA synchrotron radiation facility is described. dedicated to resonant X-ray absorption and scattering experiments using soft X-rays, in an unusually extended photon energy range from 80 above 4000 eV, with full polarization control. Its scheme includes a fixed-included-angle, variable-line-spacing grating monochromator pair refocusing mirrors, equipped benders, Kirkpatrick-Baez arrangement. It two end-stations, one for magnetic...
We report the main characteristics of advanced photoelectric effect experiments beamline, operational at Elettra storage ring, featuring a fully independent double branch scheme obtained by use chicane undulators and able to keep polarization control in both linear circular mode. The paper describes novel technical solutions adopted, namely, (a) design quasiperiodic undulator resulting optimized suppression higher harmonics over large photon energy range (10-100 eV), (b) thermal stability...
FERMI@Elettra is a free electron-laser (FEL)-based user facility that, after two years of commissioning, started preliminary users' dedicated runs in 2011. At variance with other FEL facilities, has been designed to deliver improved spectral stability and longitudinal coherence. The adopted scheme, which uses an external laser initiate the process, demonstrated be capable generating pulses close Fourier transform limit. We report on first instance wavelength tuning, both narrow large range...
Systematic understanding and real-time feedback capability for x-ray free electron laser (FEL) accelerator optical components are critical scientific experiments instrument performance.Single-shot wavefront sensing enables characterization of the intensity local electric field distribution at sample plane, something that is important such as nonlinear studies.It can also provide alignment tuning FEL beam instrumentation optics, leading to optimal performance greater operational efficiency.A...
In the field of beam physics, two frontier topics have taken center stage due to their potential enable new approaches discovery in a wide swath science. These areas are: advanced, high gradient acceleration techniques, and x-ray free electron lasers (XFELs). Further, there is intense interest marriage these fields, with goal producing very compact XFEL. this context, recent advances radio-frequency cryogenic copper structure research opened door use surface electric fields between 250 500...
Photoelectron spectra from sublimed layers of chromatographically separated $\mathrm{La}@{\mathrm{C}}_{82}$ are presented. Using photon energies corresponding to the La $3d$ $4f$ transition, a resonant enhancement La-derived valence states is observed. From calculated intensities $5d$ and $5p$ in atom we estimate that about $\frac{1}{3}$ an electron charge left La-valence orbitals for $\mathrm{La}@{\mathrm{C}}_{82}$. In contrast previous interpretations core-level photoemission studies our...
The Super-ESCA beamline has been designed for high resolution core level spectroscopy of adsorbates on single crystal surfaces using soft x-ray synchrotron radiation. It receives the light from an 81 period undulator with 5.6 cm and 4.5 m length in storage ring ELETTRA. tunability this insertion device, at a electron energy 2.0 GeV connected modified SX700 monochromator allows performance experiments photon range 100–2000 eV. This is now operational first absorption spectra are presented...
The FERMI@Elettra free electron laser (FEL) user facility is currently under construction at the Sincrotrone Trieste laboratory in (Italy). It will cover wavelength range from 100 to about 5 nm fundamental and 3 or 1 using third harmonic. We report layout of photon beam diagnostics section, radiation transport system experimental area, distribution system. Due peculiar characteristics emitted FEL (high peak power, short pulse length, statistical variation intensity distribution), realization...
This article describes the development and testing of a novel, water-cooled, active optic mirror system (called "REAL: Resistive Element Adjustable Length") that combines cooling with applied auxiliary heating, tailored to spatial distribution thermal load generated by incident beam. technique is theoretically capable sub-nanometer surface figure error control even at high power density. Tests conducted in an optical metrology laboratory synchrotron X-ray beamlines showed ability maintain...
Significance An X-ray oscillator generating fully coherent pulses at the characteristic length and time scale of atomic molecular phenomena, angstrom wavelength, femtosecond duration has been a dream laser physics from 1960s. The paper presents study an based on population inversion <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mi>K</mml:mi> <mml:mi>α</mml:mi> </mml:math> electrons in transition-metal compound, coherent, transform-limited, high-power...
The adsorption and temperature-dependent decomposition of ${\mathrm{SO}}_{2}$ on Cu(100) Cu(111) have been studied by fast high-resolution core-level photoemission. analysis the S 2p O 1s data shows that molecular dominates at 170 K. On heating ${\mathrm{SO}}_{2}$-covered surfaces to about room temperature, decomposes into SO+O+S. further SO+O recombine form ${\mathrm{SO}}_{2}$, which is only species detected in corresponding temperature-programmed desorption (TPD) experiments. From...
The Photon Analysis Delivery and REduction System of FERMI (PADReS) has been routinely used during the machine commissioning operations since 2011. It also served needs several user runs at facility from late 2012. system is endowed with online shot-to-shot diagnostics giving information about intensity, spatial-angular distribution, spectral content, as well other to determine coherence, pulse length etc. Moreover, PADReS capable manipulating beam in terms intensity optical parameters....
Measurement of the emission wavelength and spectral content photon radiation is essential information for both machine experimental physicists at a free-electron laser (FEL) user facility. Knowledge beam properties needed during optimization performing studies (i.e. monitoring change FEL output as function parameters). The experimentalists, on other hand, need to know distribution source, shot shot, discriminate acquired data. Consequently, main requirement instrument, supposed obtain this...
A sensitive, high-speed, optically addressed spatial light modulator is being developed for real-time optical dataprocessing applications involving low-level-control signals. This device expected to have a sensitivity of better than 10(-3) microJ/cm(2), framing rate about 1 kHz, and resolution approximately 20 line pairs/mm. The time response, sensitivity, resolution, other operating characteristics are studied in first-generation device; preliminary results reported.
To cover a large photon energy range, the length of an X-ray mirror is often longer than beam footprint for much applicable range. limit thermal deformation such water-cooled mirror, technique using side cooling with cooled shorter proposed. This can be optimized by finite-element analysis. For Kirkpatrick-Baez (KB) mirrors at LCLS-II, reduced factor up to 30, compared full-length cooling. Furthermore, second, alternative technique, based on similar principle presented: long, single-length...
Even if not well defined a border exists between the soft and hard X‐ray region. The optics adopted in one region is suitable for other vice versa. Nevertheless, recently more experimentalists wish to investigate their samples by using an energy range as wide possible. Without adopting complicated very expensive mechanical solutions, it major challenge, optical designer, find solution both spectral ranges. This was our task TwinMic beamline at Elettra, Italian 3rd generation synchrotron...
In this work we point out that slope errors play only a minor role in the performance of certain class x-ray optics for X-ray Free Electron Laser (XFEL) applications. Using physical propagation simulations and formalism Church Takacs [Opt. Eng. 34, 353 (1995)], show diffraction limited commonly found at XFEL facilities posses critical spatial wavelength makes them less sensitive to errors, more height error. Given number XFELs currently operating or under construction across world, hope...