1,721,023 research outputs found
Considerations about Ramo’s theorem extension to conductor media with variable dielectric constant
No full textEnhancements in pulse amplitude spectroscopy decoupling detector and preamplifier by a series inductor
No full textThe paper highlights the benefits, in terms of amplitude resolution, obtained with the insertion of a series lossless inductor between the detector and the first stage of the shaping amplifier, with respect to the traditional direct coupling without the inductor. The optimum impulse response of the shaper amplifier for infinite and finite processing times and for a general configuration of white sources of noise is investigated, together with the corresponding theoretical limits in charge resolution. With a proper choice of the value of the inductor, values of ENC2 up to a factor of 2 better than when the inductor is not present can be achieve
Double particle resolution in semiconductor drift detectors
No full textThe optimum signal processing of two close pulses produced by ionization of two close fast particles in a semiconductor drift detector is presented. The optimum is relative to the determination of charges produced by each particle and the average drift times for the released charges to reach the anode. The resolution of the charge and the drift time measurements in the presence of additive and nonadditive noises have been theoretically studied as functions of the distance between two fast ionizing particles and the amount of ionization produced by individual particles. Is it shown that the precision of the position determination of the individual particles remains good enough also in the case of a significant overlap of the two pulse
An energy interpretation of a stationary functional for the variational solution of the nonlinear Poisson equation in semiconductors at thermal equilibrium
No full textMisura agli estremi di risoluzione della densità spettrale di rumore in dispositivi elettronici
No full textOptimum filters for detector charge measurements in presence of 1/f noise
No full textThe optimum shape of the weighting function for detector charge measurements, in the presence of series 1/f noise superimposed on parallel and series white noises, is investigated. The corresponding theoretical limits in charge resolution for finite or infinite processing times have been calculated, and compared with the values obtained using traditional cusplike weighting functions optimum for white noises onl
A nonconforming exponentially fitted finite element method for two-dimensional drift-diffusion models in semiconductors
No full textFast triggering in silicon drift detectors by means of holes’ induction
No full textThe signal induced by electrons and holes on the p+ strips close to the interaction point can provide a very precise time mark of the photon interaction in a Silicon Drift Detector (SDD). A detailed study of the shape of the induced signals and of the parameters affecting the achievable time resolution is presented together with the first experimental tests on a linear SDD. The measured time resolution of the trigger signal is 1.5 ns r.m.s.. Such a fast trigger makes possible the use of SDDs as high resolution X-ray imagers and opens to the development of novel Compton telescopes for gamma-ray imaging based on Controlled Drift Detectors
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