A5004852938- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Particle Detector Development and Performance
- Dark Matter and Cosmic Phenomena
- Computational Physics and Python Applications
- Radiation Detection and Scintillator Technologies
- Medical Imaging Techniques and Applications
- Astrophysics and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Neutrino Physics Research
- Atomic and Subatomic Physics Research
- Solar and Space Plasma Dynamics
- Black Holes and Theoretical Physics
- Nuclear Physics and Applications
- Superconducting Materials and Applications
- Particle Accelerators and Free-Electron Lasers
- CCD and CMOS Imaging Sensors
- Distributed and Parallel Computing Systems
- Radio Astronomy Observations and Technology
- Gamma-ray bursts and supernovae
- Advanced MRI Techniques and Applications
- Geomagnetism and Paleomagnetism Studies
- Radiation Therapy and Dosimetry
- Ionosphere and magnetosphere dynamics
ETH Zurich
2016-2025
Institute of Particle Physics
2024-2025
University of Antwerp
2024
A. Alikhanyan National Laboratory
2022-2024
Institute of High Energy Physics
2022-2024
Board of the Swiss Federal Institutes of Technology
1994-2009
European Organization for Nuclear Research
1999-2005
RWTH Aachen University
1993-2000
Humboldt State University
1997
Paul Scherrer Institute
1994-1997
The First G-APD Cherenkov Telescope (FACT) is designed to detect cosmic gamma-rays with energies from several hundred GeV up about 10 TeV using the Imaging Atmospheric Technique. In contrast former or existing telescopes, camera of FACT telescope comprised solid-state Geiger-mode Avalanche Photodiodes (G-APD) instead photomultiplier tubes for photo detection. It first full-scale device its kind employing this new technology. operated at Observatorio del Roque de los Muchachos (La Palma,...
The First G-APD Cherenkov Telescope (FACT) is the first in-operation test of performance silicon photo detectors in Astronomy. For more than two years it operated on La Palma, Canary Islands (Spain), for purpose long-term monitoring astrophysical sources. this, crucial and therefore has been studied great detail. Special care taken their temperature voltage dependence implementing a correction method to keep properties stable. Several measurements have carried out monitor performance....
The observation of Higgs boson production in association with a top quark-antiquark pair is reported, based on combined analysis proton-proton collision data at center-of-mass energies √s = 7, 8, and 13 TeV, corresponding to integrated luminosities up 5.1, 19.7, 35.9 fb^(-1), respectively. were collected the CMS detector CERN LHC. results statistically independent searches for bosons produced conjunction decaying pairs W bosons, Z photons, τ leptons, or bottom quark jets are maximize...
Abstract In preparation of the operation CMS electromagnetic calorimeter (ECAL) barrel at High Luminosity Large Hadron Collider (HL-LHC) entire on-detector electronics will be replaced. The new readout comprises 12240 very front end (VFE), 2448 (FE) and low voltage regulator (LVR) cards arranged into towers (RTs) five VFEs, one FE LVR card. results testing RT final prototype CERN's CHARM mixed field facility PSI's proton irradiation are presented. They demonstrate proper functioning in...
Abstract In preparation for the operation at HL-LHC electronics of electromagnetic calorimeter barrel must be replaced. The new 12240 very front end (VFE) cards will amplify and digitize signals 62100 lead-tungstate crystals instrumented with avalanche photodiodes, while 2448 low voltage regulator (LVR) provide power VFE digital interface cards. Reliable these failure rates as 0.5% end-of-life, after ∼20 years, is targeted, requiring environmental stress screening (ESS). Implementation...
The First G-APD Cherenkov Telescope (FACT) was built on the Canary Island of La Palma in October 2011 as a proof principle for silicon based photosensors Astronomy. scientific goal project is to study variability active galatic nuclei (AGN) at TeV energies. Observing small sample blazars whenever possible, an unbiased data collected. This allows selected objects timescales from hours years. Results first three years monitoring will be presented. To provide quick flare alerts community and...
The First G-APD Cherenkov Telescope (FACT) is the first telescope equipped with a camera made of silicon photon detectors (G-APD aka. SiPM). Since October 2011, it regularly taking data on Canary Island La Palma. G-APDs are ideal for telescopes as they robust and stable. Furthermore, insensitivity towards strong ambient light allows to conduct observations during bright Moon twilight. This gain in observation time essential long-term monitoring TeV blazars. During commissioning phase,...
Software for Tomographic Image Reconstruction (STIR) is an open-source library PET and SPECT image reconstruction, implementing iterative reconstruction as well 2D- 3D-filtered back projection. Quantitative of data requires the knowledge scanner geometry. Typical scanners, clinical pre-clinical ones, use a block-type Several rectangular blocks crystals are arranged into regular polygons. Multiple such polygons along axis. However, geometrical representation provided by STIR cylinder made...
Abstract The barrel section of the novel MIP Timing Detector (MTD) will be constructed as part upgrade CMS experiment to provide a time resolution for single charged tracks in range 30–60 ps using LYSO:Ce crystal arrays read out with Silicon Photomultipliers (SiPMs). A major challenge operation such detector is extremely high radiation level, about 2 × 10 14 1 MeV(Si) Eqv. n/cm , that integrated over decade High Luminosity Large Hadron Collider (HL-LHC). exposed this level have shown strong...
The small animal fast insert for mRi (SAFIR) positron emission tomography was proposed quantitative dynamic acquisition inside a preclinical 7T magnetic resonance imaging scanner to study kinetics of short-lived tracers. For this purpose, the SAFIR readout should be capable handling high count rates and achieving excellent timing performance. We evaluated one available application specific integrated circuits (ASICs) SiPM readout, namely chip (STiC) version 3.1. In paper, we show...
The SAFIR collaboration is currently developing a high-rate positron emission tomography (PET) insert to study fast kinetic processes in small animals. Our designed for simultaneous image acquisition with preclinical 7 T magnetic resonance (MR) imaging device. In contrast existing PET scanners and inserts, our hardware optimized measurements source activities up 500 MBq. As first step, the Prototype was constructed. This already incorporates final components, but has reduced axial...
The proposed SAFIR PET detector will measure positron electron annihilations at injected activities up to 500 MBq in a mouse or rat. system is required have the best possible timing resolution order remove accidental coincidences (randoms) and maximise image quality for short time frames allowing possibility of 4-D kinetic modelling simultaneous MRI first time. Two different ASICs, TOFPET STiC, been investigated with LYSO crystal scintillators coupled SiPM detectors using 18F sources 480...
The SAFIR prototype insert is a preclinical Positron Emission Tomography (PET) scanner built to acquire dynamic images simultaneously with 7 T Bruker Magnetic Resonance Imaging (MRI) scanner. designed perform an excellent coincidence resolving time of 194 ps Full Width Half Maximum (FWHM) and energy resolution 13.8% FWHM. These properties enable it precise quantitative at activities as high 500 MBq suitable for studying fast biological processes within short frames (< 5 s). In this study,...
Abstract Maintaining the required performance of CMS electromagnetic calorimeter (ECAL) barrel at High-Luminosity Large Hadron Collider (HL-LHC) requires replacement entire on-detector electronics. 12240 new very front end (VFE) cards will amplify and digitize signals 61200 lead-tungstate crystals instrumented with avalanche photodiodes. The VFE host five channels CATIA pre-amplifier ASICs followed by LiTE-DTU ASICs, which 160 MS/s 12bit resolution. We present strategy infrastructure...
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...