A5029371561- Dark Matter and Cosmic Phenomena
- Particle Detector Development and Performance
- Neutrino Physics Research
- Astrophysics and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Radiation Detection and Scintillator Technologies
- Mass Spectrometry Techniques and Applications
- Atomic and Subatomic Physics Research
- CCD and CMOS Imaging Sensors
- X-ray Spectroscopy and Fluorescence Analysis
- Photocathodes and Microchannel Plates
- Particle accelerators and beam dynamics
- Nuclear Physics and Applications
- Crystallography and Radiation Phenomena
- Astro and Planetary Science
- Advanced Proteomics Techniques and Applications
- Advanced X-ray Imaging Techniques
- Additive Manufacturing and 3D Printing Technologies
- Bacteriophages and microbial interactions
- Ion-surface interactions and analysis
- Semiconductor materials and devices
- Astronomical Observations and Instrumentation
- Bacterial Identification and Susceptibility Testing
- Planetary Science and Exploration
- Analytical chemistry methods development
International Space Science Institute
2023-2025
University of Bern
2023-2025
ETH Zurich
1985-2015
This document reports on a series of experimental and theoretical studies conducted to assess the astro-particle physics potential three future large-scale particle detectors proposed in Europe as next generation underground observatories. The apparatus employ different and, some extent, complementary detection techniques: GLACIER (liquid Argon TPC), LENA scintillator) MEMPHYS (\WC), based use large mass liquids active media. results these are presented along with critical discussion...
Additive manufacturing of ion optical components for rapid prototyping in mass spectrometry. 3D printed reflectron shows similar performance to conventionally manufactured system.
Colour variations within the same type of gemstone are caused by different abundances trace elements. But apart from producing pretty colours, analysis elements in gemstones is frequently used to distinguish between synthetic and natural specimen, for provenance determination, treatment detection [1]. Every element composition closely tied its geological origin; thus, it possible determine according those unique ‘fingerprints’. However, some gemstones, such as sapphires,...
To optimise the design of light readout in ArDM 1-ton liquid argon dark matter detector, a range reflector and WLS coating combinations were investigated several small setups, where scintillation was generated by radioactive sources gas at normal temperature pressure shifted into blue region tetraphenyl butadiene (TPB). Various thicknesses TPB deposited spraying vacuum evaporation onto specular 3M{\small\texttrademark}-foil diffuse Tetratex{\small\textregistered} (TTX) substrates. Light...
The Argon Dark Matter (ArDM-1t) experiment is a ton-scale liquid argon (LAr) double-phase time projection chamber designed for direct searches. Such device allows to explore the low energy frontier in LAr with charge imaging detector. ionization extracted from into gas phase and there amplified by use of Large Electron Multiplier order reduce detection threshold. Direct fine spatial granularity, combined measurement amplitude evolution associated primary scintillation light, provide powerful...
In this paper we describe the design, construction, and operation of a first large area double-phase liquid argon Large Electron Multiplier Time Projection Chamber (LAr LEM-TPC). The detector has maximum drift length 60 cm readout consists 40 × 76 cm2 LEM 2D projective anode to multiply collect drifting charges. Scintillation light is detected by means cryogenic PMTs positioned below cathode. To record both charge signals, have developed compact acquisition system, which scalable up...
The Argon Dark Matter experiment is a ton-scale double phase argon Time Projection Chamber designed for direct searches. It combines the detection of scintillation light together with ionisation charge in order to discriminate background (electron recoils) from WIMP signals (nuclear recoils). After successful operation on surface at CERN, detector was recently installed underground Laboratorio Subterráneo de Canfranc, and commissioning ongoing. We describe status installation present first...
ArDM-1t is the prototype for a next generation WIMP detector measuring both scintillation light and ionization charge from nuclear recoils in 1-ton liquid argon target. The goal to reach minimum recoil energy of 30 keVr detect recoiling nuclei. In this paper we describe experimental concept present results on detection system, tested first time ArDM surface at CERN. With preliminary incomplete set PMTs, yield zero electric field found be between 0.3-0.5 phe/keVee depending position within...
We successfully operated a novel kind of LAr Time Projection Chamber based on Large Electron Multiplier (LEM) readout system. The prototype, about 3 liters active volume, is in liquid-vapour (double) phase pure Ar. ionization electrons, after drifting the are extracted by set grids into gas and driven holes double stage LEM, where charge amplification occurs. Each LEM thick macroscopic hole multiplier 10x10 cm$^2$ manufactured with standard PCB techniques. electrons signal via two orthogonal...
We successfully operated a novel kind of LAr Time Projection Chamber based on Large Electron Multiplier (LEM) readout system. The prototype, about 3 liters active volume, is in liquid-vapour (double) phase pure Ar. ionization electrons, after drifting the are extracted by set grids into gas and driven holes double stage LEM, where charge amplification occurs. Each LEM thick macroscopic hole multiplier 10×10 cm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML"...
In this paper we present results from a test of small Liquid Argon Large Electron Multiplier Time Projection Chamber (LAr LEM-TPC). This detector concept provides 3D-tracking and calorimetric device capable charge amplification, suited for next-generation neutrino detectors possibly direct Dark Matter searches. During 3~lt chamber equipped with 10$\times$10~cm$^2$ readout, cosmic muon data was recorded during three weeks taking. A maximum gain 6.5 achieved the liquid argon kept pure enough...
We have operated a liquid-argon large-electron-multiplier time-projection chamber (LAr LEM-TPC) with large active area of 76 $\times$ 40 cm$^2$ and drift length 60 cm. This setup represents the largest ever achieved this novel detector concept. The is equipped an immersed built-in cryogenic Greinacher multi-stage high-voltage (HV) multiplier, which, when subjected to external AC HV $\sim$1 kV$_{\mathrm{pp}}$, statically charges up voltage factor $\sim$30 higher inside LAr vessel, creating...
ArDM-1t is the first operating ton-scale liquid argon detector for direct search of Dark Matter particles. Developed at CERN as Recognized Experiment RE18, experiment has been approved in 2010 to be installed Spanish underground site LSC (Laboratorio Subterraneo de Canfranc). Under label EXP-08-2010 ArDM underwent an intensive period technical completion and safety approval until recent filling target vessel with almost 2 ton argon. This report describes experimental achievements during...
GLACIER (Giant Liquid Argon Charge Imaging ExpeRiment) is a large underground observatory for proton decay search, neutrino astrophysics and CP-violation studies in the lepton sector. Possible sites are studied within FP7 LAGUNA project (Europe) along JPARC beam collaboration with KEK (Japan). The concept scalable to very masses.
The Argon Dark Matter (ArDM-1t) experiment is a ton-scale liquid argon (LAr) double-phase time projection chamber designed for direct searches. Such device allows to explore the low energy frontier in LAr. After successful operation on surface at CERN, detector has been deployed underground and presently commissioned Canfranc Underground Laboratory (LSC). In this paper, we describe status of installation present first results data collected gas phase.
In femtosecond Laser Ablation Ionisation Mass Spectrometry (fs-LIMS) short laser pulses are used to ablate, atomise, and ionise solid sample material shot-by-shot. When ablating non-conductive samples electric charging of the surface can occur. Depending on geometry instrument, charge influence spread ablation plume reduce spectral quality. Methods were investigated using a geological miniature fs-LIMS system with co-linear geometry. Pausing five seconds between consecutive bursts fired...
At the beginning of 2010, we presented at J-PARC PAC an R$&$D program towards large (100 kton scale) liquid argon TPCs, suitable to investigate, in conjunction with neutrino beam, possibility CP violation sector and search for nucleon decay. As a first step proposed test experiment identify measure charged kaons, including their decays, argon. The detector, 250L LAr TPC, is exposed momentum range 540-800 MeV/c, K1.1BR beamline slow extraction facility. This especially important estimate...
Space exploration missions devoted to the detection of life have visited various celestial bodies in our Solar System, particularly Mars (1). Observations and analyses conducted by orbiters, landers rovers provided insight into characteristics Martian geology paleoenvironment, suggesting a past aqueous process including both subsurface surface water (ocean lakes) (2). The activity on Mars&#8217; surface, billions years ago, led precipitation sulfate minerals such as kieserite,...