Results of testing the detecting module prototype for the barrel part of the tracking system of the CLAS12 experiment are presented. The module consists of four series-connected silicon microstrip ...sensors with a 30-cm total length and FSSR2 readout chip. The measurement results of the signal along the module and noise level for different lengths of strips in the module are given. It is possible to conclude from the obtained results that, at a strip length of <30 cm, the signal-to-noise ratio is 6: 1 or higher when minimum ionizing relativistic particles are detected.
The CLAS12 experiment is intended to study the generalized parton distributions in exclusive reactions. The CLAS12 Silicon Vertex Tracker must provide the registration of all reaction products at the ...expected high luminosity. The results of a GEANT4 simulation of the expected physical rates in the SVT are presented. The frequency of the noise hits of the readout electronics is determined on the basis of the capacitive load generated by the attached sensors. In order to find the fraction of the events that are lost due to delays in the readout electronics, a computer simulation of the logic of the data-driven readout FSSR2 chip is performed. At a signal-to-noise ratio of 8 to 1 the readout electronics are capable of processing the expected rates, provided a registration threshold of 0.4 mip is preset.
The results of an analysis of data from the SERP-Е-184 experiment devoted to studying mechanisms of the production of charmed particles in proton–nucleus interactions at 70 GeV and their decays are ...presented. The data in question were obtained upon irradiating the SVD-2 active target consisting of carbon, silicon, and lead plates with a beam of 70-GeV protons. A detailed simulation on the basis of the FRITIOF7.02 and GEANT3.21 code packages made it possible to optimize event-selection criteria and to calculate the detection efficiency for Λ
c
+
baryons. After selecting a signal from the threebody decay of a Λ
c
+
baryon, the inclusive cross section for its production at near-threshold energies, its lifetime, and the parameter of the
A
dependence of the cross section were found. The Λ
c
+
-baryon yields are tabulated along with data from other experiments and theoretical predictions.
We report results from searches for neutral Higgs bosons produced in p{bar p} collisions recorded by the D0 experiment at the Fermilab Tevatron Collider. We study the production of inclusive neutral ...Higgs boson in the {tau}{tau} final state and in association with a b quark in the b{tau}{tau} and bbb final states. These results are combined to improve the sensitivity to the production of neutral Higgs bosons in the context of the minimal supersymmetric standard model (MSSM). The data are found to be consistent with expectation from background processes. Upper limits on MSSM Higgs boson production are set for Higgs boson masses ranging from 90 to 300 GeV. We exclude tan {beta} > 20-30 for Higgs boson masses below 180 GeV. These are the most stringent constraints on MSSM Higgs boson production in p{bar p} collisions.
We present a measurement of the W boson mass using data corresponding to 4.3 fb{sup -1} of integrated luminosity collected with the D0 detector during Run II at the Fermilab Tevatron p{bar p} ...collider. With a sample of 1677394 W {yields} e{nu} candidate events, we measure M{sub W} = 80.367 {+-} 0.026 GeV. This result is combined with an earlier D0 result determined using an independent Run II data sample, corresponding to 1 fb{sup -1} of integrated luminosity, to yield M{sub W} = 80.375 {+-} 0.023 GeV.
A fast current preamplifier for silicon detectors Atkin, E. V.; Voronin, A. G.; Klyuev, A. D. ...
Instruments and experimental techniques (New York),
2010/1, Letnik:
53, Številka:
1
Journal Article
Recenzirano
A circuit of a fast current preamplifier for silicon detectors is designed. The main purpose of the preamplifier is to record signals from silicon detectors, which repeat the detector current shape. ...The preamplifier noise is 0.43 nV/Hz1/2.
The stages of development and the current status of the versatile “Spectrometer with a Vertex Detector” setup designed for physics experiments at the U-70 accelerator of the Institute for High Energy ...Physics (Protvino) is described. The main detectors of the setup are the vertex detector based on silicon microstrip detectors, the wide-aperture magnetic spectrometer based on multiwire proportional chambers, and the lead-glass hodoscope γ detector. In the setup, there is a fast two-level trigger system for selecting required particle interactions. The key characteristics of the setup systems are presented, and the physical results obtained on it are briefly listed.
The performance of Double Sided silicon Strip Detectors (DSSDs) and Kapton cables for the Silicon Tracking System (STS) of the upcoming Compressed Baryonic Matter (CBM) experiment at FAIR is being ...reported. The CBM STS will consist of 8 stations of DSSDs at a distance between 25-100 cm downstream of the target. These DSSDs have a pitch of around 58 μm, stereo angle of ± 7.5 0 with double metallization on either side. Total integrated fluence is expected to reach 1×10 15 n eq cm -2 for some of the STS stations. We present the first 3-D TCAD simulated results on DSSDs using tools from SYNOPSYS. To determine the radiation hardness of these sensors, we have irradiated some of the prototypes at KRI Cyclotron facility. Our radiation damage model implemented in TCAD simulations is able to reproduce the irradiated data. Besides the static characteristics, we have also extracted interstrip parameters relevant to understand strip isolation and cross-talk issues. Transient simulations have been performed to estimate the charge collection of irradiated sensors and the collected charge has been found to exactly mimic the variation of interstrip resistance with bias voltage. Also parameters relevant for noise calculations like metal trace resistance have been measured. For ENC calculations, it is also important to determine the contribution of analog kapton cables since the length of cables could reach up to 50 cm for inner modules. We present the first finite element simulations to extract the capacitive and series resistive noise contribution from kapton cables using RAPHAEL. In order to validate RAPHAEL, we have reproduced the D0 kapton simulations which were done using ANSYS. Present prototype kapton cables have been produced at Kharkov using Aluminum traces. This paper presents a detailed comparison between Aluminum and Copper traces in terms of noise and material budget. Copper seems to be better candidate for metal traces in cables.
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