A5007985759- Particle Detector Development and Performance
- Radiation Detection and Scintillator Technologies
- Atomic and Subatomic Physics Research
- CCD and CMOS Imaging Sensors
- Photocathodes and Microchannel Plates
- Nuclear Physics and Applications
- Dark Matter and Cosmic Phenomena
- Semiconductor materials and devices
- Radiation Effects in Electronics
- Muon and positron interactions and applications
- Plasma Diagnostics and Applications
- Advancements in Semiconductor Devices and Circuit Design
- Nanowire Synthesis and Applications
- Particle physics theoretical and experimental studies
- Spectroscopy and Laser Applications
- Semiconductor materials and interfaces
- Advanced Data Storage Technologies
- Diamond and Carbon-based Materials Research
- Thermal properties of materials
- Silicon Carbide Semiconductor Technologies
- Chemical and Physical Properties of Materials
- Graphene research and applications
- Advanced Memory and Neural Computing
- Catalysts for Methane Reforming
- Advanced Chemical Physics Studies
European Organization for Nuclear Research
2017-2024
Université Paris-Saclay
2024
Aarhus University
2024
University of Bonn
2024
Helsinki Institute of Physics
2024
University of Helsinki
2024
Friedrich-Alexander-Universität Erlangen-Nürnberg
2024
TU Wien
2015-2019
European Spallation Source
2019
We present the Migdal In Galactic Dark mAtter expLoration (MIGDAL) experiment aiming at unambiguous observation and study of so-called effect induced by fast-neutron scattering. It is hoped that this elusive atomic process can be exploited to enhance reach direct dark matter search experiments lower masses, but it still lacking experimental confirmation. Our goal detect predicted electron emission which thought accompany nuclear scattering with low, calculable, probability, deploying an...
Abstract Combining gaseous detectors with a high-granularity pixelated charge readout enables experimental applications which otherwise could not be achieved. This includes high-resolution tracking of low-energetic particles, requiring ultra-low material budget, X-ray polarimetry at low energies (⪅ 2 keV) or rare-event searches profit from event selection based on geometrical parameters. In this article, the idea embedding pixel ASIC — specifically Timepix4 into micro-pattern amplification...
The prospect of pileup induced backgrounds at the High Luminosity LHC (HL-LHC) has stimulated intense interest in developing technologies for charged particle detection with accurate timing high rates. required accuracy follows directly from nominal interaction distribution within a bunch crossing ($\sigma_z\sim5$ cm, $\sigma_t\sim170$ ps). A time resolution order 20-30 ps would lead to significant reduction these backgrounds. With this goal, we present new concept called PICOSEC, which is...
The adsorption of $CO_2$ on the $Fe_3$$O_4$(001)-($\sqrt{2}$ $\times$ $\sqrt{2}$)R45{\deg} surface was studied experimentally using temperature programmed desorption (TPD), electron spectroscopies (UPS and XPS), scanning tunneling microscopy (STM). binds most strongly at defects related to Fe2+ including antiphase domain boundaries in reconstruction above incorporated Fe interstitials. On pristine surface, adsorbs molecularly fivefold-coordinated Fe3+ sites with a binding energy 0.4 eV....
To fully exploit the potential of semiconducting nanowires for devices, high quality electrical contacts are paramount importance. This work presents a detailed in situ transmission electron microscopy (TEM) study very promising type NW contact where aluminum metal enters germanium nanowire to form an extremely abrupt and clean axial metal-semiconductor interface. We this solid-state reaction between TEM using two different local heating methods. Following interface intrusion Al Ge shows...
The Gaseous Electron Multiplier-based Time Projection Chamber (GEM-TPC) in TWIN configuration for particle tracking has been consolidated after extensive investigations different facilities to study its performance. most attractive feature of this detector is ultra-low material budget, which 0.28\% X/X$_0$ and can be further reduced by decreasing the thickness gas traversed incident particles. Thus, it provides excellent position reconstruction multi-scattering. This consists two GEM-TPCs...
Abstract PICOSEC Micromegas (MM) is a precise timing gaseous detector based on Cherenkov radiator coupled with semi-transparent photocathode and an MM amplifying structure. The concept was successfully demonstrated through single-channel prototype, achieving sub-25 ps time resolution Minimum Ionizing Particles (MIPs). A series of studies followed, aimed at developing robust, large-area, scalable detectors high resolution, complemented by specialized fast-response readout electronics. This...
Abstract The Gaseous Electron Multiplier-based Time Projection Chamber (GEM-TPC) in TWIN configuration for particle tracking has been consolidated after extensive investigations different facilities to study its performance. most attractive feature of this detector is ultra-low material budget, which 0.28% X/X 0 and can be further reduced by decreasing the thickness gas traversed incident particles. Thus, it provides excellent position reconstruction multi-scattering. This consists two...
Deep learning-based object detection algorithms enable the simultaneous classification and localization of any number objects in image data. Many these are capable operating real-time on high resolution images, attributing to their widespread usage across many fields. We present an end-to-end pipeline designed for rare event searches Migdal effect, at speeds, using high-resolution data from scientific CMOS camera readout MIGDAL experiment. The effect nuclear scattering, critical sub-GeV dark...
Abstract The PICOSEC Micromegas (MM) detector is a precise timing gaseous based on MM operating in two-stage amplification mode and Cherenkov radiator. Prototypes equipped with cesium iodide (CsI) photocathodes have shown promising time resolutions as 24 picoseconds (ps) for Minimum Ionizing Particles. However, due to the high hygroscopicity susceptibility ion bombardment of CsI photocathodes, alternative photocathode materials are needed improve robustness MM. Diamond-like Carbon (DLC) film...
Abstract The PICOSEC Micromegas (MM) detector is a precise timing gaseous consisting of Cherenkov radiator combined with photocathode and MM amplifying structure. A 100-channel prototype 10 × cm 2 active area equipped Cesium Iodide (CsI) demonstrated time resolution below σ = 18 ps. objective this work to improve the robustness aspects, i.e. integration resistive carbon-based photocathodes, while maintaining good resolution. prototypes have been tested in laboratory conditions successfully...
Single-crystal Al nanowires (NWs) were fabricated by thermally induced substitution of vapor-liquid-solid grown Ge NWs Al. The resistivity the crystalline (c-Al) was determined to be ρ = (131 ± 27) × 10−9 Ω m, i.e. approximately five times higher than for bulk Al, but they withstand remarkably high current densities up 1.78 1012 A m−2 before ultimately melt due Joule heating. maximum density failure correlates with NW diameter, thinner tolerating significantly efficient heat dissipation and...
Abstract Micro-Pattern Gaseous Detectors (MPGDs) with resistive anode planes provide intrinsic discharge robustness while maintaining good spatial and time resolutions. Typically read out 1D strips or pad structures, here the characterisation results of plane MPGDs 2D strip readout are presented. A µRWELL prototype is investigated in view its use as a reference tracking detector future gaseous beam telescope. MicroMegas fine-pitch mesh (730 line-pairs-per-inch) investigated, both for...
The spatial dependence of the timing performance R3809U-50 Micro-Channel-Plate PMT (MCP-PMT) by Hamamatsu was studied in high energy muon beams. Particle position information is provided a GEM tracker telescope, while measured relative to second MCP-PMT, identical construction. In inner part circular active area (radius r<5.5 mm) time resolution two MCP-PMTs combined better than 10 ps. signal amplitude decreases outer region due less light reaching photocathode, resulting worse resolution....
The VMM3a is an Application Specific Integrated Circuit (ASIC), specifically developed for the readout of gaseous detectors. Originally within ATLAS New Small Wheel (NSW) upgrade, it has been successfully integrated into Scalable Readout System (SRS) RD51 collaboration. This allows, to use also in small laboratory set-ups and mid-scale experiments, which make Micro-Pattern Gaseous Detectors (MPGDs). As part integration SRS, data transfer scheme was optimised reach a high rate-capability...
Developments in quantum technologies the last decades have led to a wide range of applications, but also resulted numerous novel approaches explore low energy particle physics parameter space. The potential for applications high endeavors has however not yet been investigated same extent. In this paper, we propose number areas where specific built on systems such as low-dimensional (quantum dots, 2D atomic layers) or manipulations ensembles (single atom polyatomic detectors detector...
Modern imaging sensors allow for high granularity optical readout of radiation detectors such as MicroPattern Gaseous Detectors (MPGDs). Taking advantage the signal amplification factors achievable by MPGD technologies Electron Multipliers (GEMs), highly sensitive can be realised and employing gas mixtures with strong scintillation yield in visible wavelength regime, provide high-resolution event representations. Applications from X-ray to fluoroscopy tomography profit good spatial...
We report the scintillation spectra of Ar/CF 4 mixtures in range 210–800 nm, obtained under X-ray irradiation for various pressures (1–5 bar) and concentrations (0%–100%). Special care was taken to eliminate effects related space charge recombination, so that results can be extrapolated following conventional wisdom those expected minimum ionizing particles typical electric fields employed gaseous instrumentation. Our study sheds light into microscopic pathways leading this family...
Deep learning-based object detection algorithms enable the simultaneous classification and localization of any number objects in image data. Many these are capable operating real-time on high resolution images, attributing to their widespread usage across many fields. We present an end-to-end pipeline designed for rare event searches Migdal effect, using high-resolution data from a state-of-the-art scientific CMOS camera MIGDAL experiment. The effect nuclear scattering, crucial sub-GeV dark...
Combining strong signal amplification made possible by Gaseous Electron Multipliers (GEMs) with the high spatial resolution provided optical readout, highly performing radiation detectors can be realized. An optically read out GEM-based Time Projection Chamber (TPC) is presented. The device permits 3D track reconstruction combining 2D projections obtained a CCD camera timing information from photomultiplier tube. Owing to intuitive representation of tracks in images and automated control,...
Optically read out time projection chambers (TPCs) based on gaseous electron multipliers (GEMs) combine 3-D event reconstruction capabilities with high spatial resolution and charge amplification factors. The approach of reconstructing particle tracks from 2-D projections obtained imaging sensors depth information photomultiplier tubes is limited to specific cases such as straight trajectories. A combination optical electronic readout realized by a semitransparent anode placed between...