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The outer shell of the ATLAS experiment at the LHC consists of a system of toroidal air-core magnets in order to allow for the precise measurement of the transverse momentum (pT) of muons, which in many physics channels are a signature of interesting physics processes. For the precise determination of the muon momentum Monitored Drift Tube chambers (MDT) with high position accuracy are used, while...
The CALICE collaboration is preparing large scale prototypes for highly granular calorimeters for detectors to be operated at a future linear electron positron collider. During the years 2010-2012 a prototype of a SiW electromagnetic calorimeter will be assembled which in terms of dimensions and layout meets already most of the requirements given by the linear collider physics program and hence the...
The Timing Counter of the MEG experiment is designed to deliver trigger information and to accurately measure the time of flight of the e+ for searching the decay μ+ → e+ γ. It consists of two sectors upstream and downstream the decay target. Each sector is made of two layers: scintillating fibers read by APD for trigger and track reconstruction in the inner side, scintillating bars with PMT readout...
We have developed a very low noise preamplifier that meets the low-cost, high-density requirements for use with superconducting tunnel junction (STJ) arrays. The design allows the STJs' bias points to be digitally set at the μV level. We then trace out noise versus bias curves under computer control and, by showing the correlation between this noise and detector energy resolution, establish the ability...
In order to search for rare processes, all four Large Hadron Collider experiments have to use advanced triggering methods for selecting and recording the events of interest. For this reason the understanding and evaluation of the trigger performance is one of the most crucial parts of any physics analysis. This paper summarizes the status of some of the software projects in the ATLAS Collaboration...
The PHENIX Hadron Blind Detector (HBD) is a high-performance Cherenkov counter used to detect electrons in relativistic heavy ion collisions at RHIC. A High Voltage Control and Monitoring System (HVC) was developed to provide optimal control over the detector for maximal performance and protection against damage from possible discharges. The HVC comprises several novel hardware components including...
The Pixel Luminosity Telescope (PLT) is a dedicated luminosity monitor, presently under construction, for the Compact Muon Solenoid (CMS) experiment at the Large Hadron Collider (LHC). It measures the particle flux in three layers of pixel diamond detectors that are aligned precisely with respect to each other and the beam direction, utilizing simultaneously performed particle track position measurements...
The time-of-flight (TOF) wall of CBM is proposed to be assembled with MRPCs. In a relative high particle multiplicity situation (about 20kHz/cm2), multi-hit capability is one of the most demanding requirement of the detector. Crosstalk is an important reason for the deterioration the multi-hit capability of a detector. To reduce the crosstalk level, a kind of shielded long-strip two-end readout MRPC...
The RD51 collaboration was founded in April 2008 to coordinate and facilitate efforts for development of micropattern gaseous detectors (MPGDS). The 75 institutes from 25 countries bundle their effort, experience and resources to develop these emerging micropattern technologies. MPGDS are already employed in several nuclear and high-energy physics experiments, medical imaging instruments and photodetection...
A novel radiation detector based on a graphene field effect transistor (GFET) is experimentally demonstrated. The detection in GFET relies on the high sensitivity of the resistivity of graphene to the local change of electric field that can result from ionized charges produced in the underlying semiconductor substrate. We present the experimental results of our study on the graphene-based radiation...
A new compact circuit architecture is proposed for digitized preamplifiers of semiconductor detector signals, suitable for high-resolution gamma-ray spectroscopy. The circuit features single power supply, active decay time reduction, differential output with precise common mode level setting for ADC matching, auto zeroing of the differential output signal offset. Use of a single power supply minimizes...
The beam diagnostic system of the ATLAS detector comprises two diamond sensor based devices. The innovative Beam Conditions Monitor (BCM) is aimed at resolving background from collision particles by sub-ns time-of-flight measurement. The Beam Loss Monitor (BLM) is a clone of the LHC machine BLM system, replacing ionization chambers with diamond sensors. BCM uses 16 1 × 1 cm2 0.5 mm thick polycrystalline...
Vertex detectors for High Energy Physics experiments require pixel detectors featuring high spatial resolution, very good signal to noise ratio and radiation hardness. A way to face new challenges of ATLAS/SLHC future hybrid pixel vertex detectors is to use the emerging 3-D Integrated Technologies. However, commercial offers of such technologies are only very few and the 3-D designer's choice is then...
For the electromagnetic calorimeter of the PANDA detector a preamplifier ASIC named APFEL (ASIC for Panda Front-end Electronics) has been developed at GSI. It is optimized for the readout of large area avalanche photodiodes (LAAPD) with a capacitance of 300 pF and an event rate of 350 kHz. The ASIC has two equivalent analog channels each consisting of a charge sensitive amplifier, a shaper stage and...
A hybrid pulse shape discrimination (PSD) method is presented that combines a charge-integration PSD method with a reference-pulses PSD method. The reference-pulses PSD method uses detailed knowledge of the average, energy-dependent detector response to radiation. To obtain the reference pulses, a large number of neutron and gamma-ray pulses were averaged in several pulse height regions. The reference...
The 16-channel module (BaFPro) that we have originally developed for processing signals of Barium Fluoride scintillators has been recently adopted to made a pulse shape analysis with signals of Lanthanum Bromide scintillators. Our idea is to use the precision of the fast analog stretcher circuit present in the BaFPro module, to capture in precise way the amplitude peak of the LaBr3 signals. Since...
For X- and γ-ray astronomy in the coming decades, both ESA and NASA have indicated in their guidelines the importance of developing innovative instrumentation operating in the hard X- and soft γ-ray range where important scientific issues are still open, exploiting high sensitivity (50-100 times better than current instruments) for spectroscopic imaging and polarimetric observations. In this framework,...
The FMF is developing gamma ray detectors with Coplanar Grid (CPG) configuration based on (Cd, Zn)Te. The work is focused on the crystal growth of detector material as well as the development of read-out electronics and data acquisition systems (GMCA). In order to increase the active detector volume, several CPG detectors are stacked back to back. To improve overall quality of the energy spectrum...
X-ray imaging with spectral resolution, "Color X-ray imaging" is a new imaging technology that is currently attracting a lot of attention. It has however been observed that the quality of spectral response is degraded as the pixel size is reduced. This is an effect of charge sharing where the signal from a photon absorbed close to the border between two pixels is shared between pixels. This...
Synchrotron applications such as coherent X-ray diffraction and X-ray photon-correlation spectroscopy require detectors with a pixel pitch of 50 μm as highlighted by a survey with beamline scientists of Diamond Light Source synchrotron. Furthermore, the detector should also have a high frame rate, large dynamic range and large detection efficiency. The Medipix3 readout chip with a pixel pitch of 55...
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