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After operating pixel-MPGDs, we conclude that 1) a gas amplification factor higher than 1 k can be reached more easely with a Micromegas then with a single GEM, and 2) gas as detection material has essential advantages with respect to silicon. For this reason, Micromegas-like detectors should be considered to be applied in future tracking detectors.
We propose a maximum likelihood (ML) reconstruction strategy for the quantification of uptake and volume of oncological lesions in Positron Emission Tomography. The ML is applied on volumetric regional basis functions identified on smooth standard clinical images (STD-CI). The lesion to be quantified is segmented with a k-means algorithm in three areas to take into account and recover the blurring...
A wide variety of digital alternatives have been presented to replace traditional film emulsion as detection medium in β- Autoradiography. The main claim of most of the alternatives is higher sensitivity. On the other hand, spatial resolution remains the main problem to solve to be able to offer a sensible alternative to film. Solid state detectors, mainly made of silicon, are being used very actively...
The Large Hadron Collider (LHC) will go to through an increase of luminosity that will lead to Super LHC in 2016. The upgrade of the machine will increase the luminosity by a factor 10 providing an opportunity to explore new physics, but will make stringent demands to the LHC detectors. The tracking detectors of the ATLAS and CMS experiments will have to be replaced by more powerful devices. Some...
The optical links for the ATLAS Pixel detector has been passed several steps of development. After the design and production of the components itself, various tests have been performed on individual components on smaller or larger parts of the full system. Finally, the links were commissioned in situ after installation. A lot of experience has been gained and this should be used to step into the research...
Silicon trackers at the SLHC will suffer high radiation damage from particles produced during the collisions, which leads to high leakage currents. Reducing these currents in the sensors requires efficient cooling to −30 °C. The large heat of evaporation of CO2 and the low viscosity allows for a two-phase cooling system with thin and long cooling pipes, because the small flow of liquid needed leads...
It has been proposed to increase the luminosity of the Large Hadron Collider at CERN by an order of magnitude, with the upgraded machine dubbed Super-LHC. The ATLAS experiment will require a new tracker for this high luminosity operation due to radiation damage and track occupancy. In order to cope with the order of magnitude increase in pile-up backgrounds at the higher luminosity, an all silicon...
We describe a Data Acquisition and Analysis Platform (DAAP) based on the ATCA specification. The DAAP was designed for use in a multi-plane tomosynthesis X-ray imaging system but its architecture was generalized to support wide range of data acquisition, routing, and processing applications.
Linear accelerators driving Free Electron Lasers (FELs), such as Free Electron Laser in Hamburg (FLASH) or X-ray Free Electron Laser (XFEL), require a sophisticated Low Level Radio Frequency (LLRF) control system. The controller of the LLRF system should stabilize the phase and amplitude of the field in accelerating modules below 0.02 % of amplitude and 0.01 degree for phase tolerances to produce...
The linear particle accelerators use superconducting cavities working with high operating gradients. The electromagnetic wave, transferred to the cavity as a set of successive pulses, causes mechanical stresses inside the cavity. Therefore, the resonance frequency of the cavity is significantly modulated, which may lead to cavity detuning in range of hundreds of Hz. The piezoelectric actuators are...
The paper presents the methodology of design of ATCA based LLRF system for XFEL linear accelerators. The LLRF system is used to control RF field in superconducting accelerating cavities regulating amplitude up to 0.03% and phase up to 0.03 deg. It is complex mixed analogue-digital control with latency of order of few tens of nanoseconds. The ATCA architecture was chosen due to high availability and...
The Low Level RF (LLRF) control system of the Free Electron Laser in Hamburg (FLASH) is currently based on the Versa Module EuroCard (VME) standard. However, the application of Advanced Telecommunications Computing Architecture (ATCA) platform, as an alternative to the above mentioned standard, is taken into consideration. ATCA offers most of all improved reliability, because of the integrated management...
In an effort to optimize the spectroscopic performance of large volume Cadmium Zinc Telluride (CZT) radiation detectors grown by the Traveling Heater Method (THM), especially for higher energy gamma detection applications, bulk material and pixellated detector performance of THM CZT crystals at 15mm-thick and 10mm-thick were compared to that at 5mm-thick. We demonstrate that the outstanding performance...
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