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Optical investigation of radiation-induced color centers in lithium fluoride thin films for low-energy proton-beam detectors
摘要： In the last few years, the peculiar photoluminescence properties of radiation-induced color centers in lithium fluoride (LiF) films have been successfully used for advanced diagnostics of low-energy proton beams produced by the TOP-IMPLART linear accelerator for protontheraphy under development at ENEA C.R. Frascati. The two-dimensional spatial dose map of the transversal section of proton beams was fully reconstructed in a wide interval of doses. In this work the optical emission properties of LiF thin films, grown by thermal evaporation on glass and Si (100) substrates and subsequently irradiated by proton beams of nominal energy 3 MeV at doses higher than 105 Gy, were carefully investigated. Their structural and morphological analyses were performed by X-ray diffraction and atomic force microscopy. A careful comparison of the photoluminescence and photoluminescence-excitation spectra of F2 and F3+ electronic defects was performed. Substrate-enhanced photoluminescence intensity increase up to 100% was observed in colored LiF films grown on Si substrates with respect to glass ones. This behavior can be substantially ascribed to the reflective properties of the Si substrate at the emission wavelengths of F2 and F3+ CCs, although other complex effects due to the polycrystalline nature of the films cannot be excluded.
关键词： Photoluminescence,Lithium fluoride,Radiation detectors,Color centers,Thin films
更新于2025-09-23 15:23:52
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The Percival 2-Megapixel monolithic active pixel imager
摘要： The peak brilliance reached by today’s Free-Electron Laser and Synchrotron light sources requires photon detectors matching their output intensity and other characteristics in order to fully realize the sources’ potential. The Pixellated Energy Resolving CMOS Imager, Versatile And Large (Percival) is a dedicated soft X-ray imager (0.25–1 keV) developed for this purpose by a collaboration of DESY, Rutherford Appleton Laboratory/STFC, Elettra Sincrotrone Trieste, Diamond Light Source, and Pohang Accelerator Laboratory. Following several generations of prototypes, the Percival “P2M” 2-Megapixel imager — a 4.5×5 cm monolithic, stitched sensor with an uninterrupted imaging area of 4×4 cm2 (1408×1484 pixels of 27×27 μm — was produced and has demonstrated basic functionality with a ?rst-light image using visible light. It is currently being brought to full operation in a front-illuminated con?guration. The readout system being commissioned in parallel has been developed speci?cally for this imager which will produce — at full 300 Hz frame rate — data at 20 Gbit/s. A ?rst wafer with eight Percival P2M chips has undergone backthinning to enable soft X-ray detection. It has been diced and chips are currently being wirebonded. We summarize here the P2M system, the project status, and show the P2M sensor’s ?rst response to visible light.
关键词： X-ray detectors,Instrumentation for FEL
更新于2025-09-23 15:23:52
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[IEEE 2018 IEEE Asia-Pacific Conference on Antennas and Propagation (APCAP) - Auckland (2018.8.5-2018.8.8)] 2018 IEEE Asia-Pacific Conference on Antennas and Propagation (APCAP) - Performance Enhancement Of Cmos Terahertz Detector
摘要： For improving the performance of CMOS terahertz detectors, parasitic capacitance reduction technique and new working model are proposed for MOSFET devices. We investigate the influence of source parasitic capacitance and drain-to-source current on the performance of CMOS terahertz detectors and analyze the relationship to the voltage responsivity (RV) and noise equivalent power (NEP) of detectors. Experiment on the CMOS detectors with a 650GHz antenna shows the maximum improvement of voltage responsivity can attain to 155% by suppressing gate-source parasitic capacitance. The additional drain current Ids can further increase RV while NEP remains unchanged.
关键词： Antenna,CMOS THz detectors,DC current,Voltage response
更新于2025-09-23 15:23:52
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Uniform position-sensitivity verification of novel electrochemically-etched panorama mega-size polymer ion image detectors
摘要： Recent novel applications of mega-size polycarbonate ion image detectors processed in mega-size electrochemical etching chambers have raised concerns on uniform position-sensitivity and consistency in ion energy responses of detectors with different effective areas. In this context, the uniform position-sensitivity, detection efficiency and track diameters of alpha particles over a broad energy range in detectors of different effective areas; i.e. small size (2 × 2 cm2), medium sizes (17 × 17 cm2) and (22.6 × 22.6 cm2), as well as large (33 × 33 cm2) were investigated in order to make them independent of the detector effective area. Alpha particles of 6 different energies from ~0.3 to ~3.0 MeV at a fluence of ~1.0 × 104 alphas·cm?2 were studied applying 50 Hz – HV field conditions. As an example, 36 positions on 6 rows and 6 columns of a 33 × 33 cm2 detector were studied. By having the same efficiency and mean track diameter only at ~0.8 MeV alpha energy in different detector effective areas under the conditions applied, it is concluded that: (1) position-sensitivity, efficiency and alpha energy responses are consistently uniform independent of the detector effective areas for particles with dE/dX)particle ≥ dE/dX)alpha at ~0.8 MeV, but (2) a "voltage compensation factor" (Vc) commensurate with each detector effective area and type of particle should be applied for particles with dE/dX)particle < dE/dX)alpha at ~0.8 MeV for efficient, consistent and uniform ion detection.
关键词： Electrochemical etching,Polycarbonate track detectors,Effective detector area,Position-sensitivity,Voltage compensation factor
更新于2025-09-23 15:23:52
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High precision mapping of single-pixel Silicon Drift Detector for applications in astrophysics and advanced light source
摘要： A Silicon Drift Detector with 3 × 3 mm2 sensitive area was designed by INFN of Trieste and built by FBK-Trento. It represents a single-pixel precursor of a monolithic matrix of multipixel Silicon Drift Detectors and, at the same time, a model of one cell Fluorescence Detector System (XAFS) for SESAME. The point-by-point mapping tests of the detector were carried out in the X-ray facilities at INAF-IAPS in Rome, equipped with a motorized two-axis micrometric positioning system. High precision characterization of this detector was done with a radioactive 55Fe source and a collimated Ti X-ray tube equipped with a Bragg crystal monocromator. The mapping in different positions and bias condition was specifically-aimed to the detailed analysis of the charge collection efficiency at the edge of the detector. The result is important to understand and verify the aspects related to the collection of the signal with respect to the position of interactions of the photons, especially in consideration of the new design and development of monolithic multipixel detectors.
关键词： SDD,Silicon drift detectors,Mapping
更新于2025-09-23 15:23:52
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Characterization of FBK NUV-HD SiPMs for the pSCT camera proposed for the Cherenkov Telescope Array
摘要： Recent developments on Silicon Photomultipliers (SiPMs) have shown that they are particularly adequate to detect fast signal due to low-intensity light. Fondazione Bruno Kessler (FBK) has optimized these sensors for the Near-Ultraviolet Cherenkov light emitted by high energy gamma-ray showers in the atmosphere. The FBK high density SiPMs (NUV-HD) have been extensively characterized in the laboratories of the Italian Institute of Nuclear Physics (INFN) in view of equipping the focal plane camera of the Schwarzschild–Couder Telescope prototype (pSCT) in the framework of the Cherenkov Telescope Array (CTA). Here we report the performances of the 6 × 6 mm2 SiPMs based on 40 × 40 μm2 cells, in terms of gain and signal-to-noise ratio. We compare the results obtained on devices from the latest generation and grown on different substrates in order to choose the most suitable sensor for the pSCT camera.
关键词： SiPM,Cherenkov telescopes,FBK NUV-HD,Photo detectors
更新于2025-09-23 15:23:52
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Development of a solid-state position sensitive neutron detector prototype based on ?6Li-glass scintillator and digital SiPM arrays
摘要： Photomultiplier tubes (PMT) have been used extensively as the photodetector of choice in scintillation based detectors for cold and thermal neutrons. However, the limitations of PMT based scintillation neutron detectors such as their sensitivity to magnetic fields or their high operating voltages (> 1 kV) have triggered the search for alternative photodetectors for these applications. Silicon photomultipliers (SiPM) operate in the single photon regime, have lower operating voltages (~ 20 - 70 V) than PMTs and are insusceptible to magnetic field. Additional features of the SiPMs like their low production cost, compactness and higher readout rates make them a potential candidate to replace the photodetector part in these developments. Therefore, we are developing a scintillation neutron detector based on SiPM technology. The detector prototype with an active detection area of 13 cm × 13 cm is aimed to be used in the future at the TREFF instrument of the Heinz Maier-Leibnitz Zentrum (MLZ) in Garching, Germany, for neutron reflectometry experiments. In this paper, we report the detector concept, its development and the simulation results for design optimization.
关键词： Geant4,Neutron scintillation detectors,Cold and thermal neutrons,Silicon Photomultipliers (SiPM)
更新于2025-09-23 15:23:52
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[IEEE 2018 IEEE XXVII International Scientific Conference Electronics (ET) - Sozopol, Bulgaria (2018.9.13-2018.9.15)] 2018 IEEE XXVII International Scientific Conference Electronics - ET - Performance of the Front-End Electronics of the PADME charged particle detector system
摘要： The PADME charged particle detector system should detect positrons and electrons with efficiency better than 99 % and time resolution below 1 ns. The system hosts about 200 readout electronics channels whose operation has to be verified and commissioned. A custom based test system allowing to perform qualitative check of the produced front-end electronics has been developed and was used to test a total of 256 channels. The obtained time resolution was found to be consistent with the requirements and better than 500 ps for all the channels.
关键词： scintillation detectors,front-end electronics,LED driver
更新于2025-09-23 15:23:52
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[IEEE 2017 MIXDES - 24th International Conference "Mixed Design of Integrated Circuits and Systems" - Bydgoszcz, Poland (2017.6.22-2017.6.24)] 2017 MIXDES - 24th International Conference "Mixed Design of Integrated Circuits and Systems - Algorithms for elimination of charge sharing effects in single photon counting pixel detectors
摘要： This paper presents an analysis of various algorithms for hit allocation in pixel detectors for charged particle tracking. The algorithms aim to compensate the charge sharing effect and improve the detection efficiency and allocation accuracy in terms of detection efficiency and allocation accuracy. The presented algorithms compare the performance of three algorithms in total: a standard Single Threshold Counting method (STC), a Compressed Sensing algorithm (CS), and a Pattern Recognition algorithm (PR). The simulation results show that the CS and PR algorithms achieve higher detection efficiency and better allocation accuracy compared to the STC method, especially in the presence of noise and charge sharing effects.
关键词： pixel detectors,hit allocation,charge sharing
更新于2025-09-23 15:23:52
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[IEEE 2018 25th International Conference "Mixed Design of Integrated Circuits and System" (MIXDES) - Gdynia, Poland (2018.6.21-2018.6.23)] 2018 25th International Conference "Mixed Design of Integrated Circuits and System" (MIXDES) - Study of Wireless Communications Link at Subterahertz Frequencies Using FET-based Detectors
摘要： This paper focuses on the wireless link development deploying (sub)THz waves. The article describes authors’ initial approach to the research and experiments dealing with THz communications. Presented work summarises the theory and achieved results in a ?led of FET-based THz detectors and readout circuits aimed at wireless THz data transmission. Our main goal was to provide proper data transmission utilising (sub)THz carrier wave — this has been experimentally achieved at 170 GHz and 289 GHz.
关键词： THz,data transmission,FET-based detectors,wireless communications
更新于2025-09-23 15:23:52