A5027739586- Metal and Thin Film Mechanics
- Particle Detector Development and Performance
- Plasma Diagnostics and Applications
- Particle physics theoretical and experimental studies
- Radiation Detection and Scintillator Technologies
- Ion-surface interactions and analysis
- Mass Spectrometry Techniques and Applications
- Experimental Learning in Engineering
- High-Energy Particle Collisions Research
- Shape Memory Alloy Transformations
- Quantum Dots Synthesis And Properties
- Surface Roughness and Optical Measurements
- Distributed and Parallel Computing Systems
- Thin-Film Transistor Technologies
- Copper Interconnects and Reliability
- Semiconductor materials and devices
- Polymer Surface Interaction Studies
- Advanced Chemical Physics Studies
- Spectroscopy and Laser Applications
- Advanced Materials Characterization Techniques
- nanoparticles nucleation surface interactions
- Silicon Nanostructures and Photoluminescence
- Visual and Cognitive Learning Processes
- Advanced Sensor Technologies Research
- Nanopore and Nanochannel Transport Studies
Universidade Nova de Lisboa
2000-2016
LIP - Laboratory of Instrumentation and Experimental Particle Physics
2008-2016
University of Lisbon
1985-2008
Uninova
1993-2000
The ATLAS Roman Pot system is designed to determine the total proton-proton cross section as well luminosity at Large Hadron Collider (LHC) by measuring elastic proton scattering very small angles. made of four stations, located in LHC tunnel a distance about 240 m both sides interaction point. Each station equipped with tracking detectors, inserted Pots which approach beams vertically. detectors consist multi-layer scintillating fibre structures read out Multi-Anode-Photo-Multipliers.
Ion-pair formation in gaseous nitromethane (CH3NO2) induced by electron transfer has been studied investigating the products of collisions between fast potassium atoms and molecules using a crossed molecular-beam technique. The negative ions formed such were analysed time-of-flight mass spectroscopy. six most dominant product anions are NO2−, O−, CH3NO2−, OH−, CH2NO2− CNO−. By nitromethane-d3 (CD3NO2), we found that previous 17 amu assignment to O− delayed fragment, is present experiment may...
The reaction K+ACl4→K++(A−Cl4)−* with A=Sn and C was examined as a function of the collision energy from threshold up to about 40 eV in c.m. system. Total cross sections mass-selected negative ions doubly differential (energy angle) K+ have been determined. Electron affinities, bond energies, electronic excitation were calculated appearance potentials. In addition, total for SnCl4 measured are contrasted earlier results CCl4 Dispert Lacmann. Although both parent molecules same electron...
A scintillating fibre tracker is proposed to measure elastic proton scattering at very small angles in the ATLAS experiment CERN. The will be located so-called Roman Pot units a distance of 240 m on each side interaction point. An initial validation design choices was achieved beam test DESY relatively low energy electron and using slow off-the-shelf electronics. Here we report results from second carried out CERN, where new detector prototypes were tested high hadron beam, first version...
Empirical and semiempirical relations linking parameters in magnetron-assisted abnormal glow discharges can provide insight into the physical phenomena occurring lead to better control of processes utilizing such discharges. The deposition rate dependence upon pressure (at constant power) for planar magnetron sputtering copper argon has been studied. results fit empirical equation, R=KRe−βp, where R is (nm/s), p (Pa). KR increases linearly with input power (KR=a+bw); constants a b were found...
An experimental study of the dependence current intensity with pressure, at different constant voltages, Va⩽450 V, in pressure range between 3.3 and 66.7 Pa, is made for an argon–copper planar magnetron discharge. At Va⩽360 increases until approximately 12 where a maximum observed then decreases leading discharge almost to extinction. intermediate relative maximum, same followed by local minimum after which linear increase observed. higher structure maxima minima tends fade out. empirical...
The erosion depth profile of planar targets in balanced and unbalanced magnetron cathodes with cylindrical symmetry is measured along the target radius. magnetic fields have rotational symmetry. horizontal vertical components field B are at points above cathode z = 2 × 10−3 m. experimental data reveal that a function angle θ made by line defined To explain this dependence simplified model discharge developed. In scope model, pathway lengths secondary electrons pre-sheath region calculated...
The TILE CALorimeter, the hadronic sampling calorimeter of ATLAS/LHC/CERN, is made iron and polystyrene scintillating tiles. light produced in tiles absorbed guided to photomultipliers (PMTs) through wave length shifter (WLS) optical fibers. To optimize detection jets muons, top fibers away PMTs coated with an aluminum mirror. This mirror by planar magnetron sputtering. process adds excellent reproducibility a minimal thermal aggression, important for proper film adhesion plastic surface....
The variation of current intensity with pressure, at constant voltage, (I-p characteristics), was obtained for planar magnetron discharges in neon, krypton, and xenon on a copper target. analysis those curves confirms that an equation the same type as one recently by authors argon–copper discharge is adequate relation to describe dependence pressure voltage rare gases. That accounts bimodal behavior corresponding sum “magnetron term” “diode term.”
The understanding of radiation damage within cells, and thence mutagenesis, depends upon a detailed knowledge the spectroscopy dissociation dynamics water. Results new study electronic state water, using synchrotron are reported. In order to gain some insight into how water is influenced by its environment we also report photo-absorption spectra thin films poly(o-methoxyaniline) which have been suggested as good mimic for biological membranes in cellular environment. Comparison these with...
The ATLAS collaboration plans to determine the absolute luminosity of CERN LHC at Interaction Point 1 by measuring trajectory protons elastically scattered very small angles (µrad).A scintillating fibre tracker system called ALFA (Absolute Luminosity For ATLAS) is proposed for this measurement.Detector modules will be placed above and below beam axis in roman pot units a distance 240 m on each side interaction point.They allow detectors approach millimeter distance.Overlap also based...