145 research outputs found
LST detector wire and Z-strip signal routing
No full textThe BaBar collaboration has recently chisen to read out the LST wire signals. A rearrangement of the baseline design has thus become necessary. This note presents preminent details of the new baseline desig
Dimensional drawings of the signal transfer planes
No full textThis note gives further details on the wire and Z- Strip signal routing of the BaBar experimen
Startup innovative, piccole e medie imprese innovative e scaleup in Italia
No full textIl contributo mira a verificare l'impatto degli incentivi concessi dalla legislazione italiana alle startup e piccole e medie imprese innovative, verificando quante di esse si sono tramutate in scaleup, raccogliendo significavi finanziamenti di mercat
A new electronic read-out for the YAPPET scanner
No full textA small animal PET-SPECT scanner (YAPPET) prototype was built at the Physics Department of the Ferrara University and is presently being used at the Nuclear Medicine Department for radiopharmaceutical studies on rats. The first YAPPET prototype shows very good performances, but needs some improvements before it can be fully used for intensive radiopharmaceutical research. The main problem of the actual prototype is its heavy electronics, based on NIM and CAMAC standard modules. For this reason a new, compact read-out electronics was developed and tested. The results of a first series of tests made on the first prototype will be presented in the paper
Development of a plethysmography system for use under microgravity conditions
No full textWe present a novel application of strain-gauge plethysmography that is suitable to detect blood volume variations in the human venous system. The plethysmography system uses capacitive sensors that are electrically connected to a portable electronic unit to record changes of blood volume over time. Such system has been developed within a project that aimed to monitor the cerebral venous return of the astronaut during an experiment on the International Space Station. In this work, we describe the novel solution in which measurement of elongation is directly obtained by charging the sensor capacitance with a constant current. We also report the full characterization of the plethysmography system and an example of the experimental protocol that has been performed in microgravity condition. Remarkably, the system we propose is able to detect cross-sectional area variations of neck veins with enough sensitivity to be useful for studies concerning cardiac oscillations. (C) 2017 Elsevier B.V. All rights reserved
An ultra fast 100 ps, 100µm 3D pixel imager
No full textWe present the development of a charged particle pixel array imager operating in single hit detection mode. This
challenging imaging device called GigaTracker (GTK) developed for the CERN NA62 experiment is intended to
measure the position and arrival time of a pion/kaon beam with an intensity of 108*cm-2*s-1. Each particle hit is detected
in position with a precision of ~100 μm and in time with a precision of 100 ps (rmsc). The readout pixel ASIC circuit in
130 nm CMOS technology comprise an array of 1800 pixels of 300 x 300 μm2. It is connected via bump bonding to an
ultra fast solid state pixel sensor array matching the same pixel pattern. The performance of high rate and high timing
precision together with an extreme sensitivity of the pixel channel discriminating input signals with a charge as low as 1
fC (6000 electrons) are very demanding; two imaging readout architectures are presented, one with on pixel analogue
based time-to-digital-converter (TDC), the other one with digital based TDC placed at the end of each column. The
design of two pixel discriminators, a constant fraction discriminator and a time-over-threshold discriminator with time
walk correction technique will be discussed. The design challenges of two architectures will be also discussed.
Due to the high particle intensity, a huge data flow has to be handled. Hereby only data of pixels, which actually have
been hit are buffered on chip and automatically transferred off the chip. The data rate per chip is 4 Gbit/s. We present
circuit design challenges and SPICE simulations of both approaches
A New Drift Chamber TDC ReadOut for the High Intensity Program of the NA48 Experiment
No full textA new read-out for the drift chambers (DCH) (8192 channels) of the NA48 experiment at CERN has been developed and realized by the Ferrara and Torino INFN sites and has taken data during the 2002 run. The core of the system is a set of 32 VME-9U Time-to-Digital-Converter boards (NA48-TDC). The NA48-TDCs record the time of arrival of signals from the DCH and store them in 40 MHz pipelined ring memories pending the trigger supervisor's decision. Dual memories and data extraction resources allow independent and simultaneous processing of level-1 and level-2 trigger requests. Time measurements are performed by the TDC-F1 commercial ASICs, having an intrinsic time resolution of 120 ps and multi-hit capabilities. The NA48-TDC board features a maximum sustained rate of 500 kHz per channel
Effect of Diazepam on 24-Hour Blood Pressure and Heart Rate in Healthy Young Volunteers
No full textTo assess the effects of evening chronic administration
of diazepam on 24-h blood pressure (BP) and heart rate (HR)
in healthy young adults. Methods: This randomized double
blind, cross-over study evaluated the effects of diazepam 5
mg or placebo, both ingested in the evening, on 24-h ambulatory
BP and HR in healthy subjects aged 21–30. Results: A
total of 30 subjects were included in the analysis. At the end
of 4-week diazepam intake, an increase in 24-h HR mean values
was found (+5.2 beats/min, p < 0.05). Analysis of subperiods
showed that diazepam produced a 10.1% increase in
night-time HR (+6.1 beats/min, p < 0.01) without affecting
BP. A significant HR rise (+4.9 beats/min, p < 0.05) and SBP
reduction (–3.8 mm Hg, p < 0.05) were observed in the morning
hours. The HR increase persisted in day-time hours (+4.6
beats/min, p < 0.05), while BP values resulted unaffected.
Conclusions: In healthy subjects, diazepam taken as a hypnotic
agent induces a significant HR increase, possibly mediated by a decrease in vagal tone. This effect might be of clinical
relevance due to the role that HR plays as an independent
cardiovascular risk factor
A Muon Detector Based on Extruded Scintillators, WLS Fibers and GM-APD Readout for a Super B Factory
No full textThe existing muon detectors for high energy physics (HEP) experiments are mainly made of gas chambers such as Resistive Plate Chambers (RPC), Limited Streamer Tubes (LST) or Multy Wire Proportional Chambers. With the increasing of the luminosity in the new accelerators, RPCs and LSTs are not capable to maintain good performances due to the consequent increasing of the particles rate. Moreover the aging process due to the charge accumulation can be a serious issues. The MWPC are rather expensive to cover the huge areas of the new HEP experiments. Extruded scintillators together with wavelength shifter (WLS) fibers can be the active core of a new kind of muon system for high energy physics experiments. The light collected by the WLS fibers is readout by Geiger-Mode Avalanche Photo-Diodes (GM-APD) which are cheaper with respect to the PhotoMultipliers and less sensitive to temperature and bias variations with respect to the APDs. GM-APDs can also work in a magnetic field and have an outstanding time resolution that is used to measure one of the coordinates of the muon system. This way the two coordinates of a detector plane are readout by the same detector element and the ambiguity in presence of more than one track is also solved. We will report our R&D results for different detector layouts and different GM-APDs (i.e. Hamamatsu MPPC and FBK-IRST SiPM): charge spectra and efficiency measurement will be discussed in association with the noise rate. The WLS fibers parameters (i.e. light yield and time response) are essential to have good detection efficiency and resolution: tests with Kuraray and Bicron fibers will be presented and an extended study of the time resolution will be shown along with its implication on the detector performances. Setup optimization and experimental issues will be also discussed as well as the future plans and perspectives
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