A5031057169- Astrophysics and Cosmic Phenomena
- Gamma-ray bursts and supernovae
- Dark Matter and Cosmic Phenomena
- Radio Astronomy Observations and Technology
- Astrophysical Phenomena and Observations
- Pulsars and Gravitational Waves Research
- Radiation Detection and Scintillator Technologies
- Particle Detector Development and Performance
- Advanced X-ray and CT Imaging
- Neutrino Physics Research
- Medical Imaging Techniques and Applications
- Nuclear Physics and Applications
- X-ray Spectroscopy and Fluorescence Analysis
- Astronomy and Astrophysical Research
- Advanced X-ray Imaging Techniques
- Galaxies: Formation, Evolution, Phenomena
- Cosmology and Gravitation Theories
- Digital Radiography and Breast Imaging
- Advanced Optical Sensing Technologies
- Particle physics theoretical and experimental studies
- Atomic and Subatomic Physics Research
- Radiation Therapy and Dosimetry
- Astronomical Observations and Instrumentation
- Advanced Semiconductor Detectors and Materials
- Noncommutative and Quantum Gravity Theories
Kyushu University
2021
University of Wisconsin–Madison
2021
Edgewood College
2021
The University of Tokyo
2021
National Institutes for Quantum Science and Technology
2021
Princeton Plasma Physics Laboratory
2021
Tris Pharma (United States)
2016
University of Oslo
2010-2013
ETH Zurich
2006-2011
Board of the Swiss Federal Institutes of Technology
2006-2010
Recently, the Galactic center has been reported to be a source of very high energy (VHE) γ-rays by CANGAROO, VERITAS, and HESS experiments. The spectra as measured these experiments show substantial differences. In this Letter we present MAGIC observations center, resulting in detection differential γ-ray flux consistent with steady, hard-slope power law, described dNγ/(dA dt dE) = (2.9 ± 0.6) × 10-12(E/TeV)-2.2±0.2 cm-2 s-1 TeV-1. is centered at (R.A., decl.) (17h45m20s, -29°2'). This...
The MAGIC collaboration has studied the high-frequency-peaked BL Lac object 1ES 1218+30.4, at a redshift z = 0.182, using imaging air Cerenkov telescope located on Canary Island of La Palma. A gamma-ray signal was observed with 6.4 σ significance. differential energy spectrum for an threshold 120 GeV can be fitted by simple power law, yielding FE(E) (8.1 ± 2.1) × 10-7[E/(250 GeV)]-3.0±0.4 TeV-1 m-2 s-1. During 6 days observation in 2005 January, no time variability timescales found within...
The MAGIC Cherenkov telescope has observed very high energy (VHE) gamma-ray emission from the Active Galactic Nucleus 1ES1959+650 during six hours in September and October 2004. observations were carried out alternated with Crab Nebula, whose data used as reference source for optimizing gamma/hadron separation flux comparison. analysis shows VHE of ~ 8 sigma significance, at a time low activity both optical X-ray wavelengths. An integral above 180 GeV about 20% was obtained. light curve,...
We characterized the spectral response of CdTe sensors with different pixel sizes – namely 75, 150 and 300 μm bonded to latest generation IBEX single photon counting ASIC developed at DECTRIS, detect monochromatic X-ray energy in range 10–60 keV. present a comparison pulse height spectra recorded for several energies, showing dependence on size non-trivial atomic fluorescence charge sharing effects that affect detector response. The extracted resolution, terms full width half maximum or...
KITE is a novel mixed-mode CMOS electron counting ASIC developed for the readout of pixelated semiconductor radiation detectors targeted to 4D STEM applications. The chip features pixel pitch 100 μm arranged in 192 × matrix and can be bump-bonded both Si high-Z sensor materials. design an extremely fast front-end electronics use instant retrigger mechanism allow non-paralyzable mode up above 108 cts/s/pix, which corresponds 300 keV beam current 14 pA/pix. massive parallel combination with...
The long-duration γ-ray burst GRB 050713a was observed by the MAGIC Telescope 40 s after onset and followed up for 37 minutes, until twilight. observation, triggered a Swift alert, covered energies above ≈175 GeV. Using standard analysis, no evidence of signal found. As redshift not measured directly, flux upper limit estimated is still compatible with assumption an unbroken power-law spectrum extending from few hundred keV to our energy range.
The FemtoMAX beamline facilitates studies of the structural dynamics materials. Such are fundamental importance for key scientific problems related to programming materials using light, enabling new storage media and manufacturing techniques, obtaining sustainable energy by mimicking photosynthesis, gleaning insights into chemical biological functional dynamics. utilizes MAX IV linear accelerator as an electron source. photon bursts have a pulse length 100 fs, which is on timescale molecular...
Geiger-mode avalanche photodiodes (G-APD) are promising new sensors for light detection in atmospheric Cherenkov telescopes. In this paper, the design and commissioning of a 36-pixel G-APD prototype camera is presented. The data acquisition based on Domino Ring Sampling (DRS2) chip. A sub-nanosecond time resolution has been achieved. Cosmic-ray induced air showers have recorded using an imaging mirror setup, self-triggered mode. This first that such measurements carried out with complete camera.
We have designed and implemented a new trigger concept (hereafter called sumtrigger) for Cherenkov telescopes, which allowed us to lower the threshold of MAGIC telescope by factor two 25 GeV. For trigger, we subdivided camera in 24 overlapping patches, each patch consisting 18 pixels. In clipped analog signals all pixels are summed decision is subsequently derived from signal. The clipping individual before summing prevented accidental triggers large afterpulses photomultipliers (PMT)....
A multi-energy soft x-ray pinhole camera has been designed and built for the Madison Symmetric Torus reversed field pinch to aid study of particle thermal-transport, as well MHD stability physics. This novel imaging diagnostic technique combines best features from both pulse-height-analysis multi-foil methods employing a PILATUS3 detector in which lower energy threshold photon detection can be adjusted independently on each pixel. Further improvements implemented new cooled systems allow...
We present a simple fitting model for the pixel response to monochromatic X-rays in single photon counting pixelated detectors that takes into account 2D effects of charge sharing and electronic noise on process. It is based only geometrical physical parameters such as size, cloud size at depth total front-end circuitry. The equations describing point spread function integral pulse height spectrum are derived preserving genuine nature collection performances has been assessed set...
State-of-the-art X-ray breast imaging (BI) modalities such as digital tomosynthesis (DBT), contrast enhanced spectral mammography (CESM) and CT (BCT) impose demanding requirements on detectors. This work studies the performance of a GaAs two-threshold photon-counting detector (PCD) prototype for BI relevant spectra. The has 75 μm pixel size, two calibrated energy thresholds from 8 to 60 keV, x 4 cm<sup>2</sup> area 0.5 mm thick sensor. spectra used were 28 35 kVp with 2 Al filtration...
Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation T. Bretz, M. Backes, I. Braun, D. Neise, W. Rhode, K. Mannheim, F. Pauss, J. Becker, A. Biland, Britvich, S. C. Commichau, Dorner, Hadasch, Hildebrand, U. Horisberger, Kranich, E. Lorenz, Lustermann, Pohl, Ribordy, Renker, Rissi, Röser, Straumann, G. Viertel, H. von Gunten; Long‐term monitoring of bright...
Microquasars, X-ray binaries displaying relativistic jets driven by accretion onto a compact object, are some of the most efficient accelerators in Galaxy. Theoretical models predict Very High Energy (VHE) emission at base jet where particles accelerated to multi-TeV energies. This could be detected present IACTs. %Moreover, gamma-ray fluxes should increase during flaring events when rates enhanced. The MAGIC telescope observed microquasars GRS 1915+105, Cyg X-3, X-1 and SS433 for ~ 150...
A two-day workshop on beamline integration and data formatting (HDF5/NeXus) of the EIGER detector was held in Baden, Switzerland, January 24–25, 2013. Its aim to discuss technical challenges inherent with next generation high-frame-rate, high-resolution X-ray imaging detectors, specifically detector. is a photon-counting hybrid pixel developed at Paul Scherrer Institute (PSI) DECTRIS Ltd. With even higher spatial resolution frame rates than its predecessor, PILATUS detector, it will be able...
We developed a novel, accurate and robust energy calibration algorithm for single X-ray photon counting detectors suitable the use of high-Z sensor materials. The calibratable range was demonstrated to extend over wide interval from 12 keV up 150 same method can also be applied lower or higher energies. Fluorescence lines several elemental targets are used as reference 75 keV. For energies, is given by direct tube spectra end-points — extracted with semi-empirical model independently...
A multi-energy soft x-ray pin-hole camera based on the PILATUS3 100 K detector has recently been installed Madison Symmetric Torus. This photon-counting consists of a two-dimensional array ∼100 000 pixels for which photon lower-threshold cutoff energy Ec can be independently set each pixel. capability allows measurement plasma emissivity in multiple ranges with unique combination spatial and spectral resolution inference variety important properties (e.g., Te, nZ, Zeff). The dependence pixel...
We have designed and implemented a new trigger concept (hereafter called sumtrigger) for Cherenkov telescopes, which allowed us to lower the threshold of MAGIC telescope by factor two 25 GeV. For trigger, we subdivided camera in 24 overlapping patches, each patch consisting 18 pixels. In clipped analog signals all pixels are summed decision is subsequently derived from signal. The clipping individual before summing prevented accidental triggers large afterpulses photomultipliers (PMT)....