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Author Perez, M.; F. Alcalde; M. S. Haro; Sidelnik, I.; Blostein, J.J.; Gomez Berisso, M.; Lipovetzky, J.
Title Implementation of an ionizing radiation detector based on a FPGA-controlled COTS CMOS image sensor Type Conference Article
Year 2017 Publication (up) 2017 XVII Workshop on Information Processing and Control (RPIC) Abbreviated Journal
Volume Issue Pages 1-6
Keywords alpha-particle detection; beta-ray detection; CMOS image sensors; field programmable gate arrays; gamma-ray detection; ionisation chambers; gamma photon irradiation; FPGA-controlled COTS CMOS image sensor; mixed radiation field; alpha particle irradiation; shelf CMOS image sensor; ionizing radiation detector; Detectors; Field programmable gate arrays; Active pixel sensors; Biomedical imaging; Semiconductor device modeling; Random access memory; Ionizing radiation; Radiation detectors; Fpga; COTS CMOS sensors
Abstract This work presents the development and implementation of an ionizing radiation detector based on a commercial off the shelf CMOS image sensor and a FPGA. The response of the system was tested in irradiations with gamma photons, beta and alpha particles using different configurations of the image sensor. Finally, we analyze the possible uses of such configurations in the discrimination of events produced by alpha particles in mixed radiation fields.
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Series Editor Series Title Abbreviated Series Title 2017 XVII Workshop on Information Processing and Control (RPIC)
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Call Number BT @ pedrazp @ Serial 833
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Author Núñez Regueiro, M.; Esquinazi, P.; Izbizky, M.A.; Durán, C.; Castello, D.; Luzuriaga, J.
Title Tunneling systems in high temperature superconductors Type Journal Article
Year 1988 Publication (up) Annales de Physique Abbreviated Journal Ann. Phys. Fr.
Volume 13 Issue 5 Pages 401-406
Keywords acoustic wave absorption; acoustic wave velocity; barium compounds; high temperature superconductors; lanthanum compounds; rare earth compounds; strontium compounds; superconductive tunnelling; thermal conductivity of solids; tunnelling systems; high temperature superconductors; thermal conductivity; sound attenuation; sound velocity; model; low temperature specific heat; La Sr Cu O
Abstract We have measured the thermal conductivity, sound attenuation and relative variation of sound velocity of compounds of the La-Sr-Cu-O and RBa2Cu3O7 families, where R is a rare-earth. We have found that all these properties can be quantitatively correlated within a tunneling system model similar to that used in amorphous materials. This interpretation would naturally explain the anomalous linear term of the low temperature specific heat observed in these materials.
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ISSN 0003-4169 ISBN Medium
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Notes ISI:A1988Q715000009 Approved no
Call Number BT @ hernan @ Serial 264
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Author Hofer, J.A.; Bengio, S.; Haberkorn N.
Title Effect of Gd magnetic impurities on the superconducting properties of highly disordered molybdenum nitride microstrips Type Journal Article
Year 2023 Publication (up) Applied Physics A Abbreviated Journal Appl. Phys. A
Volume 129 Issue 9 Pages 631
Keywords Disordered superconductors; Metal nitrides; Magnetic impurities
Abstract We investigated the impact of Gd magnetic impurities on the superconducting properties of disordered MoNx thin films grown by reactive co-sputtering at room temperature. The samples were fabricated in the two gun cluster using Mo and Gd targets in an Ar + N2 atmosphere with a total pressure of 0.67 Pa and a N2 concentration of 7%. The study focuses in thin films with thickness between 22 and 27 nm. We modified the chemical composition by varying the power of the Gd target from 0 to 24 W, fixing the Mo in 100 W. The chemical state of the samples was analysed using X-ray Photoelectron Spectroscopy. The samples primarily exhibit an amorphous metallic Mo and Gd nitride structure. With the addition of Gd, the superconducting critical temperature is suppressed, dropping from 7.4 K for pure MoNx to below 3 K for samples containing ≈ 4.5 at.% Gd. Furthermore, the temperature dependence of the upper critical field (Hc2) and the vortex dissipation mechanism are also affected. Specifically, Hc2(0) is reduced from 10 to 7.7 T for samples with 3.1 at.% Gd. Moreover, at a temperature of 3 K, there is an increase in the magnetic field dependence of the critical current density for low Gd doping. These alterations also impact the instability of the vortex lattice, limiting the maximum achievable vortex velocity during dissipation.
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Call Number BT @ pedrazp @ Serial 890
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Author Antonio, D.; Dolz, M.I.; Pastoriza, H.
Title Micromechanical magnetometer using an all-silicon nonlinear torsional resonator Type Journal Article
Year 2009 Publication (up) Applied Physics Letters Abbreviated Journal Appl. Phys. Lett.
Volume 95 Issue 13 Pages 133505-3
Keywords damping; eddy currents; elemental semiconductors; magnetometers; micromechanical devices; nonlinear dynamical systems; oscillations; Q-factor; resonators; silicon
Abstract In this work, a micromagnetometer employing a nonlinear torsional resonator with a high quality factor Q is presented experimentally. Oscillatory rotation of a conducting plate in the sensed magnetic field H induces eddy currents that dissipate energy. Due to the nonlinear response of the oscillator, the resulting mechanical damping originates frequency shifts in the resonance curve that depend on H. Nonlinearity results from the electrostatic detection, which introduces high order electrical spring constants. The device is fabricated with a standard silicon process and does not incorporate ferromagnetic materials. An analytical nonlinear model that correctly describes the device is also introduced.
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Call Number BT @ hernan @ Serial 564
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Author Lederman, D.; Hasen, J.; Schuller, I.K.; Osquiguil, E.; Bruynseraede, Y.
Title Photoinduced superconductivity and structural changes in high temperature superconducting films Type Journal Article
Year 1994 Publication (up) Applied Physics Letters Abbreviated Journal
Volume 64 Issue 5 Pages 652-654
Keywords Annealing; Electric conductivity measurement; Lighting; Oxygen; Praseodymium compounds; Quenching; Semiconducting films; Structure (composition); Superconductivity; Thermal effects; Thin films; Yttrium compounds; Contraction; Oxygen vacancy; Photoinduced superconductivity; Stoichiometry; Superconducting critical temperature; High temperature superconductors
Abstract The illumination of PryGd1-yBa2Cu 3Ox semiconducting and superconducting thin films increases their critical temperatures and decreases their normal state resistivities if and only if the films are oxygen deficient. Moreover, these changes are enhanced near the Pr-induced metal-insulator transition. Light also causes a contraction of the c-axis in YBa2Cu3Ox which is correlated with the observed photoinduced resistivity changes. These changes are similar to those observed when oxygen-deficient YBa 2Cu3Ox is enriched with oxygen or annealed at room temperature after quenching from high temperatures.
Address Laboratorium voor Vaste Stof-Fysika en Magnetisme, Katholieke Universiteit Leuven, Celestijnenlaan 200 D, B-3001 Leuven, Belgium
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ISSN 00036951 (ISSN) ISBN Medium
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Notes Cited By (since 1996): 37; Export Date: 17 April 2009; Source: Scopus; doi: 10.1063/1.111078; Language of Original Document: English; Correspondence Address: Lederman, D.; Physics Department; University of California-San Diego San Diego, CA 92093-0319, United States Approved no
Call Number BT @ osquigui @ Serial 390
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Author Fernandes, A.; Chan, I.; Guimpel, J.; Nakamura, O.; Lederman, D.; Schuller, I.
Title Scaling of critical currents in high-temperature superconducting superlattices and thin films Type Journal Article
Year 1992 Publication (up) Applied Physics Letters Abbreviated Journal Appl. Phys. Lett.
Volume 61 Issue 26 Pages 3181
Keywords High?Tc Superconductors; Thin Films; Superlattices; Critical Current; Temperature Dependence; Scaling Laws; Anisotropy
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Call Number BT @ jguimpel @ Serial 608
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Author Nakamura, O.; Guimpel, J.; Sharifi, F.; Dynes, R.; Schuller, I.
Title Synthesis and properties of a-axis and b-axis oriented GdBa2Cu3O7-d high Tc thin films Type Journal Article
Year 1992 Publication (up) Applied Physics Letters Abbreviated Journal Appl. Phys. Lett.
Volume 61 Issue 21 Pages 2598
Keywords Gadolinium Oxides; Barium Oxides; Copper Oxides; Quaternary Compounds; High?Tc Superconductors; Film Growth; Sputtering; Magnetrons; Crystal Orientation; Control; Temperature Effects; X?Ray Diffraction
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Call Number BT @ jguimpel @ Serial 609
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Author Nakamura, O.; Fullerton, E.; Guimpel, J.; Schuller, I.
Title High Tc thin films with roughness smaller than one unit cell Type Journal Article
Year 1992 Publication (up) Applied Physics Letters Abbreviated Journal Appl. Phys. Lett.
Volume 60 Issue 1 Pages 120
Keywords High?Tc Superconductors; Thin Films; Superlattices; Epitaxy; Magnetrons; Sputtering; Roughness; Thickness
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Call Number BT @ jguimpel @ Serial 610
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Author Nakamura, O.; Chan, I.; Guimpel, J.; Schuller, I.
Title New buffer layer for high?temperature superconducting ceramics on sapphire: LaBa2Cu3Oy/Ag bilayers Type Journal Article
Year 1991 Publication (up) Applied Physics Letters Abbreviated Journal Appl. Phys. Lett.
Volume 59 Issue 10 Pages 1245
Keywords Superconducting Films; Fabrication; High?Tc Superconductors; Lanthanum Oxides; Barium Oxides; Copper Oxides; Silver; Superconducting Junctions; Superconductivity; Dysprosium Oxides; Sputtering; Sapphire; Crystal Structure; Crystal Growth; Very High Temperature
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Call Number BT @ jguimpel @ Serial 611
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Author Alcalde Bessia, F.; Flandre, D.; André, N.; Irazoqui, J.; Pérez, M.; Gómez Berisso, M.; Lipovetzky, J.
Title Ultra Low Power Ionizing Dose Sensor Based on Complementary Fully Depleted MOS Transistors for Radiotherapy Application Type Journal Article
Year 2019 Publication (up) IEEE Transactions on Nuclear Science Abbreviated Journal IEEE Transactions on Nuclear Science
Volume Issue Pages 1-1
Keywords Transistors; Temperature measurement; Voltage measurement; Threshold voltage; Radiation effects; Current measurement; Semiconductor device measurement; Silicon radiation detectors; Ionizing radiation sensors; Silicon-on-insulator
Abstract We evaluate the use of the thick buried oxide (BOX) of Fully Depleted Silicon-on-Insulator (FD-SOI) transistors for Total Ionizing Dose (TID) measurements in a radiotherapy application. The devices were fabricated with a custom process in UniversitC) Catholique de Louvain (UCL) which allows to make accumulation mode PMOS transistors and inversion mode NMOS transistors. We characterized the temperature behavior of these devices and the response under X-ray radiation produced by an Elekta radiotherapy linear accelerator, and compared the obtained dose sensitivity to other published works. Taking advantage of these devices, an ultra low power MOS ionizing dose sensor, or MOS dosimeter, with inherent temperature compensation is presented. This dosimeter achieved a sensitivity of 154 mV/Gy with a temperature error factor of 13 mGy/°C and a current consumption below 1 nA.
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Call Number BT @ pedrazp @ Serial 841
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