A5107428703- 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
- Cosmology and Gravitation Theories
- Computational Physics and Python Applications
- Neutrino Physics Research
- Radiation Detection and Scintillator Technologies
- Silicon and Solar Cell Technologies
- Astrophysics and Cosmic Phenomena
- Black Holes and Theoretical Physics
- Advanced Semiconductor Detectors and Materials
- Medical Imaging Techniques and Applications
- CCD and CMOS Imaging Sensors
- Radiation Effects in Electronics
- Particle Accelerators and Free-Electron Lasers
- Semiconductor materials and devices
- Distributed and Parallel Computing Systems
- Advanced X-ray and CT Imaging
- Atomic and Subatomic Physics Research
- Nuclear reactor physics and engineering
- Electronic and Structural Properties of Oxides
- Semiconductor materials and interfaces
- Radiation Therapy and Dosimetry
Lappeenranta-Lahti University of Technology
2020-2025
Helsinki Institute of Physics
2015-2024
Institute of High Energy Physics
2012-2024
A. Alikhanyan National Laboratory
2022-2024
University of Antwerp
2024
Institut de Recherche sur les Lois Fondamentales de l'Univers
2012-2023
University of Helsinki
2014-2023
Université Paris-Saclay
2023
CEA Paris-Saclay
2012-2023
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2012-2023
The CMS detector at the CERN LHC features a silicon pixel as its innermost subdetector. original has been replaced with an upgraded system (CMS Phase-1 detector) in extended year-end technical stop of 2016/2017. is designed to cope higher instantaneous luminosities that have achieved by after upgrades accelerator during first long shutdown 2013–2014. Compared detector, better tracking performance and lower mass four barrel layers three endcap disks on each side provide hit coverage up...
For the planned luminosity upgrade of CERN LHC to sLHC new radiation hard technologies for tracking detectors are investigated. Corresponding increase, dose will be approximately a factor ten higher than currently installed in experiments. One option tolerant 3D silicon with columnar electrodes penetrating into bulk. This article reports results beam test measurements performed 3D-DDTC (Double-Sided, Double Type Column) strip detectors, where columns do not pass through detector completely....
The upgrade of the LHC to High-Luminosity (HL-LHC) is expected increase design luminosity by an order magnitude. This will require silicon tracking detectors with a significantly higher radiation hardness. CMS Tracker Collaboration has conducted irradiation and measurement campaign identify suitable sensor materials strip designs for future outer tracker at experiment. Based on these results, collaboration chosen use n-in-p type sensors focus further investigations optimization that type....
We report a fabrication process of pixel detectors made bulk cadmium telluride (CdTe) crystals. Prior to processing, the quality and defect density in CdTe material was characterized by infrared (IR) spectroscopy. The semiconductor detector Flip-Chip (FC) interconnection processing carried out clean room premises Micronova Nanofabrication Centre Espoo, Finland. chip scale processes consist aluminum oxide (Al2O3) low temperature thermal Atomic Layer Deposition (ALD), titanium tungsten (TiW)...
As a result of the foreseen increase in luminosity Large Hadron Collider, discrimination between collision products and possible magnet quench-provoking beam losses primary proton beams is becoming more critical for safe accelerator operation. We report results ongoing research efforts targeting upgrading monitoring system by exploiting Beam Loss Monitor detectors based on semiconductors located as close to superconducting coils triplet magnets. In practice, this means that will have be...
Abstract The CMS Inner Tracker, made of silicon pixel modules, will be entirely replaced prior to the start High Luminosity LHC period. One crucial components new Tracker system is readout chip, being developed by RD53 Collaboration, and in particular its analogue front-end, which receives signal from sensor digitizes it. Three different front-ends (Synchronous, Linear, Differential) were designed implemented RD53A demonstrator chip. A dedicated evaluation program was carried out select most...
The results of the CMS tracker alignment analysis are presented using data from cosmic tracks, optical survey information, and laser system at Tracker Integration Facility CERN. During several months operation in spring summer 2007, about five million track events were collected with a partially active Tracker. This allowed us to perform first silicon modules tracks three different statistical approaches; validate performance; test stability structures under various stresses temperatures...
During summer 2006 a fraction of the CMS silicon strip tracker was operated in comprehensive slice test called Magnet Test and Cosmic Challenge (MTCC). At MTCC, cosmic rays detected muon chambers were used to trigger readout all sub-detectors general data acquisition system presence 4 T magnetic field produced by superconducting solenoid. This document describes operation Tracker hardware software prior, during after taking. The performance detector as resulting from MTCC analysis is also presented.
A new CMS tracker detector will be installed for operation at the High Luminosity LHC (HL-LHC). This comprises modules with two closely spaced parallel sensor plates and front-end ASICs capable of transmitting tracking information to Level-1 (L1) trigger 40 MHz beam crossing rate. The inclusion in L1 decision essential selecting events interest efficiently HL-LHC. Binary Chip (CBC) has been designed read out correlate hits from pairs sensors, forming so-called track stubs. For first time, a...
The degradation of signal in silicon sensors is studied under conditions expected at the CERN High-Luminosity LHC. 200 μm thick n-type are irradiated with protons different energies to fluences up 3 · 1015 neq/cm2. Pulsed red laser light a wavelength 672 nm used generate electron-hole pairs sensors. induced signals determine charge collection efficiencies separately for electrons and holes drifting through sensor. effective trapping rates extracted by comparing results simulation. electric...
High-luminosity particle collider experiments such as the ones planned at High-Luminosity Large Hadron Collider require ever-greater vertexing precision of tracking detectors, necessitating also reductions in material budget detectors. Traditionally, fractional radiation length ($x/X_0$) detectors is either estimated using known properties constituent materials, or measured dedicated runs final detector. In this paper, we present a method direct measurement CMS prototype module designed for...
Abstract Defects in semiconductor crystals can have significant detrimental effects on their performance as radiation detectors. cause charge trapping and recombination, leading to lower signal amplitudes poor energy resolution. We designed built a modular 3D scanner for analyzing these defects samples using commercial off-the-shelf components. Previous solutions offer great spatial resolution, but limited sample holding capacity use continuum light sources which difficulty differentiating...
High resistivity magnetic Czochralski Si detectors were irradiated with /sup 60/Co gamma rays, neutrons, and protons to various doses/fluences, along control float zone detectors. 1) It has been found that for radiation, behave similarly the high-temperature, long-time (HTLT) oxygenated There is no space charge sign inversion there a buildup of positive charges. The rate this much higher than proportional oxygen concentration. 2) For neutron little difference between silicon Space observed...
In March 2007 the assembly of Silicon Strip Tracker was completed at Integration Facility CERN. Nearly 15% detector instrumented using cables, fiber optics, power supplies, and electronics intended for operation LHC. A local chiller used to circulate coolant low temperature operation. order understand efficiency alignment strip tracker modules, a cosmic ray trigger implemented. From through July 4.5 million triggers were recorded. This period, referred as Sector Test, provided practical...