A5002268454- Particle Detector Development and Performance
- Dark Matter and Cosmic Phenomena
- Medical Imaging Techniques and Applications
- Advanced X-ray Imaging Techniques
- Particle physics theoretical and experimental studies
- Astrophysics and Cosmic Phenomena
- Astrophysical Phenomena and Observations
- Radiation Detection and Scintillator Technologies
- CCD and CMOS Imaging Sensors
- Nuclear Physics and Applications
- X-ray Spectroscopy and Fluorescence Analysis
- Particle Accelerators and Free-Electron Lasers
- Calibration and Measurement Techniques
- Nuclear reactor physics and engineering
- Advanced X-ray and CT Imaging
- Electron and X-Ray Spectroscopy Techniques
- Adaptive optics and wavefront sensing
- Superconducting Materials and Applications
- Atomic and Subatomic Physics Research
- Radiation Therapy and Dosimetry
- Solar and Space Plasma Dynamics
- Cosmology and Gravitation Theories
- Pulsars and Gravitational Waves Research
- High-pressure geophysics and materials
- Astronomy and Astrophysical Research
European X-Ray Free-Electron Laser
2014-2024
Universidad de Zaragoza
2016
Technical University of Darmstadt
2006-2015
Max Planck Institute for Extraterrestrial Physics
2006-2015
University College London
2015
Universidade do Estado do Rio de Janeiro
2012
Istituto Nazionale di Fisica Nucleare, Sezione di Genova
2012
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati
2012
Hanyang University
2012
University of California, Berkeley
2012
The European Photon Imaging Camera (EPIC) consortium has provided the focal plane instruments for three X-ray mirror systems on XMM-Newton. Two cameras with a reflecting grating spectrometer in optical path are equipped MOS type CCDs as detectors (Turner [CITE]), telescope full photon flux operates novel pn-CCD an imaging spectrometer. camera system was developed under leadership of Max-Planck-Institut für extraterrestrische Physik (MPE), Garching. concept is described well different...
We have searched for solar axions or similar particles that couple to two photons by using the CERN Axion Solar Telescope (CAST) setup with improved conditions in all detectors. From absence of excess X-rays when magnet was pointing Sun, we set an upper limit on axion-photon coupling 8.8 x 10^{-11} GeV^{-1} at 95% CL m_a <~ 0.02 eV. This result is best experimental over a broad range axion masses and eV also supersedes previous derived from energy-loss arguments globular-cluster stars.
Hypothetical axionlike particles with a two-photon interaction would be produced in the sun by Primakoff process. In laboratory magnetic field ("axion helioscope"), they transformed into x-rays energies of few keV. Using decommissioned Large Hadron Collider test magnet, CERN Axion Solar Telescope ran for about 6 months during 2003. The first results from analysis these data are presented here. No signal above background was observed, implying an upper limit to axion-photon coupling...
We have searched for solar axions or other pseudoscalar particles that couple to two photons by using the CERN Axion Solar Telescope (CAST) setup. Whereas we previously reported results from CAST with evacuated magnet bores (Phase I), setting limits on lower mass axions, here report where were filled 4He gas II) of variable pressure. The introduction generates a refractive photon mγ, thereby achieving maximum possible conversion rate those axion masses ma match mγ. With 160 different...
The CERN Axion Solar Telescope (CAST) has extended its search for solar axions by using 3He as a buffer gas. At T=1.8 K this allows larger pressure settings and hence sensitivity to higher axion masses than our previous measurements with 4He. With about 1 h of data taking at each 252 different we have scanned the mass range 0.39 eV < m_a 0.64 eV. From absence excess X-rays when magnet was pointing Sun set typical upper limit on axion-photon coupling g_ag 2.3 x 10^{-10} GeV^{-1} 95% CL, exact...
The CERN Axion Solar Telescope has finished its search for solar axions with (3)He buffer gas, covering the range 0.64 eV ≲ ma 1.17 eV. This closes gap to cosmological hot dark matter limit and actually overlaps it. From absence of excess x rays when magnet was pointing Sun we set a typical upper on axion-photon coupling gaγ 3.3 × 10(-10) GeV(-1) at 95% C.L., exact value depending pressure setting. Future direct axion searches will focus increasing sensitivity smaller values gaγ, example by...
The idea of using ultrashort X-ray pulses to obtain images single proteins frozen in time has fascinated and inspired many. It was one the arguments for building free-electron lasers. According theory, extremely intense provide sufficient signal dispense with crystals as an amplifier, pulse duration permits capturing diffraction data before sample inevitably explodes. This first demonstrated on biological samples a decade ago giant mimivirus. Since then, large collaboration been pushing...
In non-hadronic axion models, which have a tree-level axion-electron interaction, the Sun produces strong flux by bremsstrahlung, Compton scattering, and axio-recombination, ``BCA processes.'' Based on new calculation of this flux, including for first time we derive limits Yukawa coupling gae axion-photon interaction strength gaγ using CAST phase-I data (vacuum phase). For ma≲10 meV/c2 find < 8.1 × 10−23 GeV−1 at 95% CL. We stress that next-generation helioscope such as proposed IAXO could...
The CERN Axion Solar Telescope (CAST) searches for $a\ensuremath{\rightarrow}\ensuremath{\gamma}$ conversion in the 9 T magnetic field of a refurbished LHC test magnet that can be directed toward Sun. Two parallel bores filled with helium adjustable pressure to match x-ray refractive mass ${m}_{\ensuremath{\gamma}}$ axion search ${m}_{a}$. After vacuum phase (2003--2004), which is optimal ${m}_{a}\ensuremath{\lesssim}0.02\text{ }\text{ }\mathrm{eV}$, we used $^{4}\mathrm{He}$ 2005--2007...
The first DSSC 1-Mpixel camera became available at the European XFEL (EuXFEL) in Hamburg area February 2019.It was successfully tested, installed, and commissioned Spectroscopy Coherent Scattering Instrument.DSSC is a high-speed, large-area, 2-D imaging detector system optimized for photon science applications energy range between
We present pulse phase resolved spectra of the hypergiant high mass X-ray binary GX 301-2. observed source in 2001 October with RXTE continuously for a total on-source time almost 200 ks. model continuum both, heavily absorbed partial covering and reflection model. In either case we find that well known cyclotron resonant scattering feature (CRSF) at ~35 keV is – although all phases strongly variable over pulse: line position varies by 25% from 30 fall secondary to 38 main where it deepest....
The CERN Axion Solar Telescope (CAST) has been in operation and taking data since 2003. main objective of the CAST experiment is to search for a hypothetical pseudoscalar boson, axion, which might be produced core sun. basic physics process based on time inverted Primakoff effect, by an axion can converted into detectable photon external electromagnetic field. resulting x-ray photons are expected thermally distributed between 1 7 keV. most sensitive detector system pn-CCD combined with...
We have searched for 14.4 keV solar axions or more general axion-like particles (ALPs), that may be emitted in the M1 nuclear transition of 57Fe, by using axion-to-photon conversion CERN Axion Solar Telescope (CAST) with evacuated magnet bores (Phase I). From absence excess monoenergetic X-rays when was pointing to Sun, we set model-independent constraints on coupling constants pseudoscalar couple two photons and a nucleon gaγ|−1.19gaN0+gaN3| < 1.36 × 10−16 GeV−1 ma 0.03 eV at 95% confidence level.
We present the development and prototype test of LPD instrument, a novel pixel detector for European XFEL. At XFEL must be capable operating with frame rate 4.5MHz record images dynamic range 1:100,000 photons (12keV) whilst maintaining low noise. The system has large in memory depth 512 that can selected flexible veto system. Data is then transferred off head between pulses an accompanying high data acquisition been prototyped assembled into contains custom silicon sensors ASICs as well...
The European X-ray Free-Electron Laser (EuXFEL) delivers extremely intense (>10 12 photons pulse −1 and up to 27000 pulses s ), ultrashort (<100 fs) transversely coherent radiation, at a repetition rate of 4.5 MHz. Its unique beam parameters enable novel groundbreaking experiments in ultrafast photochemistry material sciences the Femtosecond Experiments (FXE) scientific instrument. This paper provides an overview currently implemented experimental baseline instrumentation its...
The European X-ray Free Electron Laser (XFEL.EU) is an international research facility presently under construction in the area of Hamburg, Germany, which will start its operation at end 2016 [1 M. Altarelli, Laser, XFEL GmbH, Technical Design Report (2006). [Google Scholar]]. superconducting linear accelerator deliver electron bunches with energy up to 17.5 GeV, arranged trains typically 2700 a repetition rate 4.5 MHz. Each train be followed by gap 99.4 ms. Spatially coherent X-rays are...
A MHz frame rate X-ray area detector (LPD — Large Pixel Detector) is under development by the Rutherford Appleton Laboratory for European XFEL. The will have 1 million pixels and allows analogue storage of 512 images taken at 4.5 in front end. LPD has 500 μm thick silicon sensor tiles that are bump bonded to a readout ASIC. ASIC's preamplifier provides relatively low noise high speed which results dynamic range 105 photons over an energy 5–20 keV. Small scale prototypes 32 × 256 2-Tile...
The simulation of radioactive decays is a common task in Monte-Carlo systems such as Geant4. Usually, system either uses an approach focusing on the simulations every individual decay or which simulates large number with focus correct overall statistics. package presented this work permits, for first time, use both methods within same framework—Geant4. accuracy statistical our new package, RDM-extended, and that existing Geant4 per-decay implementation (original RDM), has also been...
An approximate method for estimating the drift of multi‐bent structures is presented. Structures that are singly or doubly symmetrical in plan and comprising any combination shear walls, coupled rigid frames braced frames, can be considered. Results uniform with height compare closely results from stiffness matrix computer analyses. The developed coupled‐wall deflection theory which expressed terms non‐dimensional structural parameters. parameters involve three properties: individual bending...
Radioactive decays are of concern in a wide variety applications using Monte-Carlo simulations. In order to properly estimate the quality such simulations, knowledge accuracy decay simulation is required. We present validation original Geant4 Decay Module, which uses per-decay sampling approach, and an extended package for Geant4-based radioactive decays, which, addition being able use refactored sampling, capable statistical approach. The based on measurements calibration isotope sources...
A generalized approach to the deflection analysis of uniform braced frame, rigid and coupled wall structures is presented. It shown that these three types belong a family cantilevers whose deflections can be defined by their bending shear characteristics. The equation written in terms two nondimensional characteristic structural parameters. Deflection equations are presented for lateral loading cases: uniformly distributed, triangularly concentrated load at top.The method useful rapid hand...