Vicente Herrero - Academia.edu (original) (raw)

Papers by Vicente Herrero

Research paper thumbnail of Evaluation of the spectroscopic performance of the integrated multi-channel charge-sensitive preamplifier of TRACE with a silicon detector prototype

2016 IEEE Nuclear Science Symposium, Medical Imaging Conference and Room-Temperature Semiconductor Detector Workshop (NSS/MIC/RTSD), 2016

In this work the experimental results are presented showing the spectroscopic performance of the ... more In this work the experimental results are presented showing the spectroscopic performance of the ASIC multichannel charge-sensitive preamplifier of TRACE (TRacking Array for light Charged particle Ejectiles). The results were obtained connecting a silicon pad detector to a custom-designed preamplifier board with eight ASIC CSPs. The detector and the board were put in a vacuum chamber with a triple Am-Cm-Pu alpha source. The output signals were digitized with four FPGApowered 100 MHz 14-bit resolution digitizer cards. The energy resolution obtained is around 22 keV at 5486 keV. The results are very encouraging and pave the way for future developments.

Research paper thumbnail of Efficiency of the topological signature in the NEXT-White detector

arXiv: Instrumentation and Detectors, 2019

In experiments searching for neutrinoless double-beta decay, the possibility of identifying the t... more In experiments searching for neutrinoless double-beta decay, the possibility of identifying the two emitted electrons is a powerful tool in rejecting background events and therefore improving the overall sensitivity of the experiment. In this paper we present the first measurement of the efficiency of a cut based on the different event signatures of double and single electron tracks, using the data of the NEXT-White detector, the first detector of the NEXT experiment operating underground. Using a \TO\ calibration source to produce signal-like and background-like events with energies near 1.6 MeV, a signal efficiency of 71.3pm1.571.3 \pm 1.571.3pm1.5 (fit)\% for a background acceptance of 20.3pm0.420.3 \pm 0.420.3pm0.4 (fit)\% is found, in good agreement with Monte Carlo simulations. An extrapolation to the energy region of the neutrinoless double beta decay by means of Monte Carlo simulations is also carried out, and the results obtained show a slight improvement over those obtained at lower energies.

Research paper thumbnail of A programmable, multichannel power supply for SIPMs with temperature compensation loop and Ethernet interface

Journal of Instrumentation, 2016

Research paper thumbnail of ASIC Front-End for Multianode Photomultiplier based PET systems with Gain Adjustment and Depth of Interaction measurement

2006 IEEE Nuclear Science Symposium Conference Record, 2006

ABSTRACT We present an improved front-end ASIC architecture which can be used either with Multian... more ABSTRACT We present an improved front-end ASIC architecture which can be used either with Multianode Photomultiplier Tubes or with silicon photomultipliers in a continuous crystal Positron Emission Tomography detector. Gamma-ray impact position and depth of interaction is obtained through a DPC charge division network. A Current Sensitive Preamplifier Stage isolates the PM outputs from the resistor network and introduce a digitally programmable gain adjustment. DOI is calculated from the width of the scintillation light distribution which can be obtained from the sum of anode voltages. A stage of transconductance amplifiers and a high speed current mode adder scheme do the voltage addition operation.

Research paper thumbnail of First evaluation results of PESIC, an integrated front-end for PET applications

2008 IEEE Nuclear Science Symposium Conference Record, 2008

PESIC is an integrated front-end designed for position sensitive photomultiplier based detectors.... more PESIC is an integrated front-end designed for position sensitive photomultiplier based detectors. Its architecture allows to improve information obtained from the detector. First of all, its preamplying stage introduces two main benefits: digitally programmable gain adjustment for every photomultiplier output, and isolation from front-end electronics by means of current buffers. This last feature allows using different types of photomultipliers such

Research paper thumbnail of Lenguaje VHDL: diseño de sistemas de microprocesadores sencillos (IV)

Al abordar el diseno de un sistema digital medianamente complejo no hay que centrarse en la gener... more Al abordar el diseno de un sistema digital medianamente complejo no hay que centrarse en la generacion de una maquina de estados, tal como se indico en el articulo anterior de esta serie. La mayoria de veces es inviable codificar todos los estados, por lo que hay que dividir el sistema en diferentes modulos (subsistemas), cada uno de los cuales realizara una tarea especifica; es decir, se debera realizar un diseno modular con una cierta jerarquia.

Research paper thumbnail of A mixed hardware-software approach to flexible Artificial Neural Network training on FPGA

2009 International Symposium on Systems, Architectures, Modeling, and Simulation, 2009

FPGAs offer a promising platform for the implementation of Artificial Neural Networks (ANNs) and ... more FPGAs offer a promising platform for the implementation of Artificial Neural Networks (ANNs) and their training, combining the use of custom optimized hardware with low cost and fast development time. However, purely hardware realizations tend to focus on throughput, resorting to restrictions on applicable network topology or low-precision data representation, whereas flexible solutions allowing a wide variation of network parameters and training algorithms are usually restricted to software implementations. This paper proposes a mixed approach, introducing a system-on-chip (SoC) implementation where computations are carried out by a high efficiency neural coprocessor with a large number of parallel processing elements. System flexibility is provided by on-chip software control and the use of floating-point arithmetic, and network parallelism is exploited through replicated logic and application-specific coprocessor architecture, leading to fast training time. Performance results and design limitations and trade-offs are discussed. I.

Research paper thumbnail of Position sensitive scintillator based detector improvements by means of an integrated front-end

Nuclear Instruments & Methods in Physics Research Section a-Accelerators Spectrometers Detectors and Associated Equipment, 2009

... V. Herrero a , Corresponding Author Contact Information , E-mail The Corresponding Author , N... more ... V. Herrero a , Corresponding Author Contact Information , E-mail The Corresponding Author , N. Ferrando a , JD Martínez a , Ch.W. Lerche a , JM Monzó a , F. Mateo a , RJ Colom a , R. Gadea a , A. Sebastià a and JM ... Keywords: Position sensitive detector; ASIC; Equalization. ...

Research paper thumbnail of AMIC: an expandable integrated analog front-end for light distribution moments analysis

Journal of Instrumentation, 2011

Research paper thumbnail of Front-end electronics for accurate energy measurement of double beta decays

Nuclear Instruments & Methods in Physics Research Section a-Accelerators Spectrometers Detectors and Associated Equipment, 2012

NEXT, a double beta decay experiment that will operate in Canfranc Underground Laboratory (Spain)... more NEXT, a double beta decay experiment that will operate in Canfranc Underground Laboratory (Spain), aims at measuring the neutrinoless double-b decay of the 136Xe isotope using a TPC filled with enriched Xenon gas at high pressure operated in electroluminescence mode. One technological challenge of the experiment is to achieve resolution better than 1% in the energy measurement using a plane of UV sensitive photomultipliers readout with appropriate custom-made front-end electronics. The front-end is designed to be sensitive to the single photo-electron to detect the weak primary scintillation light produced in the chamber, and also to be able to cope with the electroluminescence signal (several hundred times higher and with a duration of microseconds). For efficient primary scintillation detection and precise energy measurement of the electroluminescent signals the front-end electronics features low noise and adequate amplification. The signal shaping provided allows the digitization of the signals at a frequency as low as 40 MHz.

Research paper thumbnail of Programmable integrated front-end for SiPM/PMT PET detectors with continuous scintillating crystal

Journal of Instrumentation, 2012

Research paper thumbnail of Design of the PET-MR system for head imaging of the DREAM Project

Nuclear Instruments & Methods in Physics Research Section a-Accelerators Spectrometers Detectors and Associated Equipment, 2013

In this paper we describe the overall design of a PET-MR system for head imaging within the frame... more In this paper we describe the overall design of a PET-MR system for head imaging within the framework of the DREAM Project as well as the first detector module tests. The PET system design consists of 4 rings of 16 detector modules each and it is expected to be integrated in a head dedicated radio frequency coil of an MR scanner. The PET modules are based on monolithic LYSO crystals coupled by means of optical devices to an array of 256 Silicon Photomultipliers. These types of crystals allow to preserve the scintillation light distribution and, thus, to recover the exact photon impact position with the proper characterization of such a distribution. Every module contains 4 Application Specific Integrated Circuits (ASICs) which return detailed information of several light statistical momenta. The preliminary tests carried out on this design and controlled by means of ASICs have shown promising results towards the suitability of hybrid PET-MR systems.

Research paper thumbnail of Expandable programmable integrated front-end for scintillator based photodetectors

2012 IEEE Nuclear Science Symposium and Medical Imaging Conference Record (NSS/MIC), 2012

ABSTRACT Scintillator based photodetectors tend to increase the number of output signals in order... more ABSTRACT Scintillator based photodetectors tend to increase the number of output signals in order to improve spatial and energy resolutions. AMIC architecture was introduced in previous works as an alternative to traditional charge division front-ends. This novel architecture not only allowed to reduce the number of signals to be acquired but also provided more information about the light distribution on the photodetector surface. Another key feature of this new approach lies in its ability to manage any number of inputs, thus offering an expandable solution for photodetectors with a large number of output signals. The underlying idea in AMIC architecture is to calculate the moments of the detected light distribution in an analog fashion. Due to the additive nature of the moment calculation, the operation can be carried out on a single device or split it into several devices, adding the partial results afterwards. A new integrated front-end device AMIC2GR has been developed which improves several features of the original AMIC architecture. A new preamplifier configuration extends the maximum capacitive load thus allowing compatibility with many types of photomultipliers including SiPM without loss of performance. In order to test the expandability of AMIC architecture using the new AMIC2GR, a front end with 4 devices has been developed. Measurements with a 256-SiPM array were made. Furthermore, a new calibration method (Edna Calibration Method) to compensate gain and detector module differences was developed and tested. AMIC2GR allows to calibrate each SiPM individually to obtain better spatial resolution and homogeneity.

Research paper thumbnail of Analysis of time resolution in a dual head LSO+PSPMT PET system using low pass filter interpolation and digital constant fraction discriminator techniques

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2009

... [5] JD Martínez, Ph.D. Thesis, Universidad Politécnica de Valencia, 2008. [6] EC Ifeachor and... more ... [5] JD Martínez, Ph.D. Thesis, Universidad Politécnica de Valencia, 2008. [6] EC Ifeachor and BW Jervis, Digital Signal Processing: A Practical Approach, Addison-Wesley, Harlow (1993). [7] R. Fontaine et al., IEEE Trans. Nucl. Sci. NS-55 (2008), p. 34. ...

Research paper thumbnail of NEXT-100 Technical Design Report (TDR). Executive summary

Journal of Instrumentation, 2012

Research paper thumbnail of Digital Signal Processing Techniques to Improve Time Resolution in Positron Emission Tomography

IEEE Transactions on Nuclear Science, 2011

Puesta a punto de un modelo de rinosinusitis crónica asociada a poliposis nasal monitorizado medi... more Puesta a punto de un modelo de rinosinusitis crónica asociada a poliposis nasal monitorizado mediante técnicas de análisis de imágenes micro CT-PET TRABAJO FIN DE GRADO EN BIOTECNOLOGÍA ALUMNO: D. SERGIO RIUS ROCABERT

Research paper thumbnail of Readout electronics for the SiPM tracking plane in the NEXT-1 prototype

Nuclear Instruments & Methods in Physics Research Section a-Accelerators Spectrometers Detectors and Associated Equipment, 2012

NEXT is a new experiment to search for neutrinoless double beta decay using a 100 kg radio-pure h... more NEXT is a new experiment to search for neutrinoless double beta decay using a 100 kg radio-pure high-pressure gaseous xenon TPC with electroluminescence readout. A large-scale prototype with a SiPM tracking plane has been built. The primary electron paths can be reconstructed from time-resolved measurements of the light that arrives to the SiPM plane. Our approach is to measure how many photons have reached each SiPM sensor each microsecond with a gated integrator. We have designed and tested a 16-channel front-end board that includes the analog paths and a digital section. Each analog path consists of three different stages: a transimpedance amplifier, a gated integrator and an offset and gain control stage. Measurements show good linearity and the ability to detect single photoelectrons. .

Research paper thumbnail of The dynamics of ions on phased radio-frequency carpets in high pressure gases and application for barium tagging in xenon gas time projection chambers

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

Radio-frequency (RF) carpets with ultra-fine pitches are examined for ion transport in gases at a... more Radio-frequency (RF) carpets with ultra-fine pitches are examined for ion transport in gases at atmospheric pressures and above. We develop new analytic and computational methods for modeling RF ion transport at densities where dynamics are strongly influenced by buffer gas collisions. An analytic description of levitating and sweeping forces from phased arrays is obtained, then thermodynamic and kinetic principles are used to calculate ion loss rates in the presence of collisions. This methodology is validated against detailed microscopic SIMION simulations. We then explore a parameter space of special interest for neutrinoless double beta decay experiments: transport of barium ions in xenon at pressures from 1 to 10 bar. Our computations account for molecular ion formation and pressure dependent mobility as well as finite temperature effects. We discuss the challenges associated with achieving suitable operating conditions, which lie beyond the capabilities of existing devices, using presently available or near-future manufacturing techniques.

Research paper thumbnail of A new inverse discrete wavelet packet transform architecture

Seventh International Symposium on Signal Processing and Its Applications, 2003. Proceedings., 2003

In this paper we present a new architecture and its scheduling algorithm for the 1-D Inverse Disc... more In this paper we present a new architecture and its scheduling algorithm for the 1-D Inverse Discrete Wavelet Packet Transform. The proposed architecture is based on two different RPA-modified blocks to compute three complete levels. We make use of folding and retiming different implementations using lifting transformation and polyphase decomposition for the CDF2.2 biorthogonal wavelet coefficients are discussed. The lifting implementation requires approximately 45% less hardware resources than the polyphase shucture. Finally, internal pipelining delays minimize the logic depth to one adder, obtaining a maximally fast stmcture. We have designed the same architecture with polyphase decomposition instead of lifting transform. obtaining worseresultS. The work is organized as follows: next section develops OUT architecture based on two RPA-modified blocks to describes the filter bank architecture factorization and polyphase decomposition. Finally the proposal merging the two RPA-modified blocks. Comparisons and conclusions are made in the fifth section. 2 INVERSE DISCRETE WAVELET PACKET TRANSFORM (IDWPT) the classical Recursive Pyramid We use compute three levels (eight subbands), The third to improve the area and speed-rate' Two fourth section describes the complete DWPT architecture The Wavelet Packet Transform was introduced in [3] by generalizing the link between multiresolution

Research paper thumbnail of Low-diffusion Xe-He gas mixtures for rare-event detection: electroluminescence yield

Journal of High Energy Physics, 2020

Contents 1 Introduction 1 2 Experimental setup 4 3 Method 5 4 Experimental results and discussion... more Contents 1 Introduction 1 2 Experimental setup 4 3 Method 5 4 Experimental results and discussion 6 5 Conclusions 12

Research paper thumbnail of Evaluation of the spectroscopic performance of the integrated multi-channel charge-sensitive preamplifier of TRACE with a silicon detector prototype

2016 IEEE Nuclear Science Symposium, Medical Imaging Conference and Room-Temperature Semiconductor Detector Workshop (NSS/MIC/RTSD), 2016

In this work the experimental results are presented showing the spectroscopic performance of the ... more In this work the experimental results are presented showing the spectroscopic performance of the ASIC multichannel charge-sensitive preamplifier of TRACE (TRacking Array for light Charged particle Ejectiles). The results were obtained connecting a silicon pad detector to a custom-designed preamplifier board with eight ASIC CSPs. The detector and the board were put in a vacuum chamber with a triple Am-Cm-Pu alpha source. The output signals were digitized with four FPGApowered 100 MHz 14-bit resolution digitizer cards. The energy resolution obtained is around 22 keV at 5486 keV. The results are very encouraging and pave the way for future developments.

Research paper thumbnail of Efficiency of the topological signature in the NEXT-White detector

arXiv: Instrumentation and Detectors, 2019

In experiments searching for neutrinoless double-beta decay, the possibility of identifying the t... more In experiments searching for neutrinoless double-beta decay, the possibility of identifying the two emitted electrons is a powerful tool in rejecting background events and therefore improving the overall sensitivity of the experiment. In this paper we present the first measurement of the efficiency of a cut based on the different event signatures of double and single electron tracks, using the data of the NEXT-White detector, the first detector of the NEXT experiment operating underground. Using a \TO\ calibration source to produce signal-like and background-like events with energies near 1.6 MeV, a signal efficiency of 71.3pm1.571.3 \pm 1.571.3pm1.5 (fit)\% for a background acceptance of 20.3pm0.420.3 \pm 0.420.3pm0.4 (fit)\% is found, in good agreement with Monte Carlo simulations. An extrapolation to the energy region of the neutrinoless double beta decay by means of Monte Carlo simulations is also carried out, and the results obtained show a slight improvement over those obtained at lower energies.

Research paper thumbnail of A programmable, multichannel power supply for SIPMs with temperature compensation loop and Ethernet interface

Journal of Instrumentation, 2016

Research paper thumbnail of ASIC Front-End for Multianode Photomultiplier based PET systems with Gain Adjustment and Depth of Interaction measurement

2006 IEEE Nuclear Science Symposium Conference Record, 2006

ABSTRACT We present an improved front-end ASIC architecture which can be used either with Multian... more ABSTRACT We present an improved front-end ASIC architecture which can be used either with Multianode Photomultiplier Tubes or with silicon photomultipliers in a continuous crystal Positron Emission Tomography detector. Gamma-ray impact position and depth of interaction is obtained through a DPC charge division network. A Current Sensitive Preamplifier Stage isolates the PM outputs from the resistor network and introduce a digitally programmable gain adjustment. DOI is calculated from the width of the scintillation light distribution which can be obtained from the sum of anode voltages. A stage of transconductance amplifiers and a high speed current mode adder scheme do the voltage addition operation.

Research paper thumbnail of First evaluation results of PESIC, an integrated front-end for PET applications

2008 IEEE Nuclear Science Symposium Conference Record, 2008

PESIC is an integrated front-end designed for position sensitive photomultiplier based detectors.... more PESIC is an integrated front-end designed for position sensitive photomultiplier based detectors. Its architecture allows to improve information obtained from the detector. First of all, its preamplying stage introduces two main benefits: digitally programmable gain adjustment for every photomultiplier output, and isolation from front-end electronics by means of current buffers. This last feature allows using different types of photomultipliers such

Research paper thumbnail of Lenguaje VHDL: diseño de sistemas de microprocesadores sencillos (IV)

Al abordar el diseno de un sistema digital medianamente complejo no hay que centrarse en la gener... more Al abordar el diseno de un sistema digital medianamente complejo no hay que centrarse en la generacion de una maquina de estados, tal como se indico en el articulo anterior de esta serie. La mayoria de veces es inviable codificar todos los estados, por lo que hay que dividir el sistema en diferentes modulos (subsistemas), cada uno de los cuales realizara una tarea especifica; es decir, se debera realizar un diseno modular con una cierta jerarquia.

Research paper thumbnail of A mixed hardware-software approach to flexible Artificial Neural Network training on FPGA

2009 International Symposium on Systems, Architectures, Modeling, and Simulation, 2009

FPGAs offer a promising platform for the implementation of Artificial Neural Networks (ANNs) and ... more FPGAs offer a promising platform for the implementation of Artificial Neural Networks (ANNs) and their training, combining the use of custom optimized hardware with low cost and fast development time. However, purely hardware realizations tend to focus on throughput, resorting to restrictions on applicable network topology or low-precision data representation, whereas flexible solutions allowing a wide variation of network parameters and training algorithms are usually restricted to software implementations. This paper proposes a mixed approach, introducing a system-on-chip (SoC) implementation where computations are carried out by a high efficiency neural coprocessor with a large number of parallel processing elements. System flexibility is provided by on-chip software control and the use of floating-point arithmetic, and network parallelism is exploited through replicated logic and application-specific coprocessor architecture, leading to fast training time. Performance results and design limitations and trade-offs are discussed. I.

Research paper thumbnail of Position sensitive scintillator based detector improvements by means of an integrated front-end

Nuclear Instruments & Methods in Physics Research Section a-Accelerators Spectrometers Detectors and Associated Equipment, 2009

... V. Herrero a , Corresponding Author Contact Information , E-mail The Corresponding Author , N... more ... V. Herrero a , Corresponding Author Contact Information , E-mail The Corresponding Author , N. Ferrando a , JD Martínez a , Ch.W. Lerche a , JM Monzó a , F. Mateo a , RJ Colom a , R. Gadea a , A. Sebastià a and JM ... Keywords: Position sensitive detector; ASIC; Equalization. ...

Research paper thumbnail of AMIC: an expandable integrated analog front-end for light distribution moments analysis

Journal of Instrumentation, 2011

Research paper thumbnail of Front-end electronics for accurate energy measurement of double beta decays

Nuclear Instruments & Methods in Physics Research Section a-Accelerators Spectrometers Detectors and Associated Equipment, 2012

NEXT, a double beta decay experiment that will operate in Canfranc Underground Laboratory (Spain)... more NEXT, a double beta decay experiment that will operate in Canfranc Underground Laboratory (Spain), aims at measuring the neutrinoless double-b decay of the 136Xe isotope using a TPC filled with enriched Xenon gas at high pressure operated in electroluminescence mode. One technological challenge of the experiment is to achieve resolution better than 1% in the energy measurement using a plane of UV sensitive photomultipliers readout with appropriate custom-made front-end electronics. The front-end is designed to be sensitive to the single photo-electron to detect the weak primary scintillation light produced in the chamber, and also to be able to cope with the electroluminescence signal (several hundred times higher and with a duration of microseconds). For efficient primary scintillation detection and precise energy measurement of the electroluminescent signals the front-end electronics features low noise and adequate amplification. The signal shaping provided allows the digitization of the signals at a frequency as low as 40 MHz.

Research paper thumbnail of Programmable integrated front-end for SiPM/PMT PET detectors with continuous scintillating crystal

Journal of Instrumentation, 2012

Research paper thumbnail of Design of the PET-MR system for head imaging of the DREAM Project

Nuclear Instruments & Methods in Physics Research Section a-Accelerators Spectrometers Detectors and Associated Equipment, 2013

In this paper we describe the overall design of a PET-MR system for head imaging within the frame... more In this paper we describe the overall design of a PET-MR system for head imaging within the framework of the DREAM Project as well as the first detector module tests. The PET system design consists of 4 rings of 16 detector modules each and it is expected to be integrated in a head dedicated radio frequency coil of an MR scanner. The PET modules are based on monolithic LYSO crystals coupled by means of optical devices to an array of 256 Silicon Photomultipliers. These types of crystals allow to preserve the scintillation light distribution and, thus, to recover the exact photon impact position with the proper characterization of such a distribution. Every module contains 4 Application Specific Integrated Circuits (ASICs) which return detailed information of several light statistical momenta. The preliminary tests carried out on this design and controlled by means of ASICs have shown promising results towards the suitability of hybrid PET-MR systems.

Research paper thumbnail of Expandable programmable integrated front-end for scintillator based photodetectors

2012 IEEE Nuclear Science Symposium and Medical Imaging Conference Record (NSS/MIC), 2012

ABSTRACT Scintillator based photodetectors tend to increase the number of output signals in order... more ABSTRACT Scintillator based photodetectors tend to increase the number of output signals in order to improve spatial and energy resolutions. AMIC architecture was introduced in previous works as an alternative to traditional charge division front-ends. This novel architecture not only allowed to reduce the number of signals to be acquired but also provided more information about the light distribution on the photodetector surface. Another key feature of this new approach lies in its ability to manage any number of inputs, thus offering an expandable solution for photodetectors with a large number of output signals. The underlying idea in AMIC architecture is to calculate the moments of the detected light distribution in an analog fashion. Due to the additive nature of the moment calculation, the operation can be carried out on a single device or split it into several devices, adding the partial results afterwards. A new integrated front-end device AMIC2GR has been developed which improves several features of the original AMIC architecture. A new preamplifier configuration extends the maximum capacitive load thus allowing compatibility with many types of photomultipliers including SiPM without loss of performance. In order to test the expandability of AMIC architecture using the new AMIC2GR, a front end with 4 devices has been developed. Measurements with a 256-SiPM array were made. Furthermore, a new calibration method (Edna Calibration Method) to compensate gain and detector module differences was developed and tested. AMIC2GR allows to calibrate each SiPM individually to obtain better spatial resolution and homogeneity.

Research paper thumbnail of Analysis of time resolution in a dual head LSO+PSPMT PET system using low pass filter interpolation and digital constant fraction discriminator techniques

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2009

... [5] JD Martínez, Ph.D. Thesis, Universidad Politécnica de Valencia, 2008. [6] EC Ifeachor and... more ... [5] JD Martínez, Ph.D. Thesis, Universidad Politécnica de Valencia, 2008. [6] EC Ifeachor and BW Jervis, Digital Signal Processing: A Practical Approach, Addison-Wesley, Harlow (1993). [7] R. Fontaine et al., IEEE Trans. Nucl. Sci. NS-55 (2008), p. 34. ...

Research paper thumbnail of NEXT-100 Technical Design Report (TDR). Executive summary

Journal of Instrumentation, 2012

Research paper thumbnail of Digital Signal Processing Techniques to Improve Time Resolution in Positron Emission Tomography

IEEE Transactions on Nuclear Science, 2011

Puesta a punto de un modelo de rinosinusitis crónica asociada a poliposis nasal monitorizado medi... more Puesta a punto de un modelo de rinosinusitis crónica asociada a poliposis nasal monitorizado mediante técnicas de análisis de imágenes micro CT-PET TRABAJO FIN DE GRADO EN BIOTECNOLOGÍA ALUMNO: D. SERGIO RIUS ROCABERT

Research paper thumbnail of Readout electronics for the SiPM tracking plane in the NEXT-1 prototype

Nuclear Instruments & Methods in Physics Research Section a-Accelerators Spectrometers Detectors and Associated Equipment, 2012

NEXT is a new experiment to search for neutrinoless double beta decay using a 100 kg radio-pure h... more NEXT is a new experiment to search for neutrinoless double beta decay using a 100 kg radio-pure high-pressure gaseous xenon TPC with electroluminescence readout. A large-scale prototype with a SiPM tracking plane has been built. The primary electron paths can be reconstructed from time-resolved measurements of the light that arrives to the SiPM plane. Our approach is to measure how many photons have reached each SiPM sensor each microsecond with a gated integrator. We have designed and tested a 16-channel front-end board that includes the analog paths and a digital section. Each analog path consists of three different stages: a transimpedance amplifier, a gated integrator and an offset and gain control stage. Measurements show good linearity and the ability to detect single photoelectrons. .

Research paper thumbnail of The dynamics of ions on phased radio-frequency carpets in high pressure gases and application for barium tagging in xenon gas time projection chambers

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

Radio-frequency (RF) carpets with ultra-fine pitches are examined for ion transport in gases at a... more Radio-frequency (RF) carpets with ultra-fine pitches are examined for ion transport in gases at atmospheric pressures and above. We develop new analytic and computational methods for modeling RF ion transport at densities where dynamics are strongly influenced by buffer gas collisions. An analytic description of levitating and sweeping forces from phased arrays is obtained, then thermodynamic and kinetic principles are used to calculate ion loss rates in the presence of collisions. This methodology is validated against detailed microscopic SIMION simulations. We then explore a parameter space of special interest for neutrinoless double beta decay experiments: transport of barium ions in xenon at pressures from 1 to 10 bar. Our computations account for molecular ion formation and pressure dependent mobility as well as finite temperature effects. We discuss the challenges associated with achieving suitable operating conditions, which lie beyond the capabilities of existing devices, using presently available or near-future manufacturing techniques.

Research paper thumbnail of A new inverse discrete wavelet packet transform architecture

Seventh International Symposium on Signal Processing and Its Applications, 2003. Proceedings., 2003

In this paper we present a new architecture and its scheduling algorithm for the 1-D Inverse Disc... more In this paper we present a new architecture and its scheduling algorithm for the 1-D Inverse Discrete Wavelet Packet Transform. The proposed architecture is based on two different RPA-modified blocks to compute three complete levels. We make use of folding and retiming different implementations using lifting transformation and polyphase decomposition for the CDF2.2 biorthogonal wavelet coefficients are discussed. The lifting implementation requires approximately 45% less hardware resources than the polyphase shucture. Finally, internal pipelining delays minimize the logic depth to one adder, obtaining a maximally fast stmcture. We have designed the same architecture with polyphase decomposition instead of lifting transform. obtaining worseresultS. The work is organized as follows: next section develops OUT architecture based on two RPA-modified blocks to describes the filter bank architecture factorization and polyphase decomposition. Finally the proposal merging the two RPA-modified blocks. Comparisons and conclusions are made in the fifth section. 2 INVERSE DISCRETE WAVELET PACKET TRANSFORM (IDWPT) the classical Recursive Pyramid We use compute three levels (eight subbands), The third to improve the area and speed-rate' Two fourth section describes the complete DWPT architecture The Wavelet Packet Transform was introduced in [3] by generalizing the link between multiresolution

Research paper thumbnail of Low-diffusion Xe-He gas mixtures for rare-event detection: electroluminescence yield

Journal of High Energy Physics, 2020

Contents 1 Introduction 1 2 Experimental setup 4 3 Method 5 4 Experimental results and discussion... more Contents 1 Introduction 1 2 Experimental setup 4 3 Method 5 4 Experimental results and discussion 6 5 Conclusions 12