Response of Silicon photo-multipliers to a constant light flux

The response of a Silicon Photomultiplier to a constant illumination has been interpreted in term of Geiger- Mueller avalanche frequency, actually correlated to the photon flux via the photon detection efficiency. The hypothesis has been verified in laboratory tests and applied throughout the development of a device for real-time dosimetry in mammography

Characterization of a thinned back illuminated MIMOSA V sensor as a visible light camera

Abstract This paper reports the measurements that have been performed both in the Silicon Detector Laboratory at the University of Insubria (Como, Italy) and at the Instituto Ricerche SOlari Locarno (IRSOL) to characterize a CMOS pixel particle detector as a visible light camera. The CMOS sensor has been studied in terms of Quantum Efficiency in the visible spectrum, image blooming and reset inefficiency in saturation condition. The main goal of these measurements is to prove that this kind of particle detector can also be used as an ultra fast, 100% fill factor visible light camera in solar physics experiments

Photon-number statistics with Silicon photomultipliers

We present a description of the operation of a multi-pixel detector in the presence of non-negligible dark-count and cross-talk effects. We apply the model to devise self-consistent calibration strategies to be performed on the very light under investigation

SiPM technology applied to radiation sensor development

The Silicon Photo-Multiplier (SiPM) being yet in its infancy, a full protocol for the sensor characterization has been developed and implemented at the Physics Department of Universita\u2019 dell\u2019Insubria. Sensors from different producers have been analyzed and compared, in view of the integration in the instruments for radiation detection. Exemplary illustrations are reported here, together with the first results on real-time dosimetry in mammography

Mammodos – In-Vivo Dosimetry in Mammography

In the scope of the RAPSODI EU research project, a prototype detector for in-vivo dose measurements in Mammography was developed. We present and discuss first results on the system qualification, in particular on the linear dynamic range, the energy response and the radiological as well as optical transparency of the detector

Imaging of biological samples with silicon pixel detectors

Beta autoradiography is a well-established technique to measure the distribution of macromolecule concentration in biological samples. The potential of silicon pixel detectors for imaging tritium radio-labeled samples has already been demonstrated. In the following, a direct comparison between two general purpose sensors, MIMOSA5 and MEDIPIX2, characterized by complementary technologies and architectures is reported. The MIMOSA5 is a high-granularity monolithic CMOS active pixel detector with full analog output, while the MEDIPIX2 is a hybrid device with moderate granularity and a counting architecture. The comparison is based on two main figures: the effective activity and the dark counting rate. Tests were performed relying on tritium standards for autoradiography, with specific activities comparable to radio-labeled proteins in daily use. Different algorithms were developed and tested to discriminate against stochastic noise and cosmic rays. The results do confirm the advantage of real time granular sensors against films and phosphor imaging screens and set the basis for an optimized, customized development

High granularity silicon beam monitors for wide range multiplicity beams

The DAFNE BeamTest Facility (BTF) at the INFN Laboratories in Frascati provides electron and positron beams in the energy range tens of MeV-750 MeV in a wide range of intensity, from 1 up to 1010 particles per pulse. The pulse rate is 50 Hz. This paper describes the implementation of two types of high granularity silicon beam monitors: two pairs of silicon strip detectors readout by single particle ASICs for the low multiplicity range (1-100 particles) and a silicon strip detector with charge integrating electronics to cover the remaining range (100-1010). Both the silicon detectors are characterized by large dimensions (up to 9.5 79.5 cm2) and a granularity in the 100 \u3bcm range. The paper describes the two systems and the results obtained during several dedicated runs

ILC Reference Design Report Volume 1 - Executive Summary

The International Linear Collider (ILC) is a 200-500 GeV center-of-mass high-luminosity linear electron-positron collider, based on 1.3 GHz superconducting radio-frequency (SCRF) accelerating cavities. The ILC has a total footprint of about 31 km and is designed for a peak luminosity of 2x10^34 cm^-2s^-1. This report is the Executive Summary (Volume I) of the four volume Reference Design Report. It gives an overview of the physics at the ILC, the accelerator design and value estimate, the detector concepts, and the next steps towards project realization.The International Linear Collider (ILC) is a 200-500 GeV center-of-mass high-luminosity linear electron-positron collider, based on 1.3 GHz superconducting radio-frequency (SCRF) accelerating cavities. The ILC has a total footprint of about 31 km and is designed for a peak luminosity of 2x10^34 cm^-2s^-1. This report is the Executive Summary (Volume I) of the four volume Reference Design Report. It gives an overview of the physics at the ILC, the accelerator design and value estimate, the detector concepts, and the next steps towards project realization