Laser de Eletrons Livres (do ingles Free Electron Laser - FEL) e uma fonte para geracao de radiac... more Laser de Eletrons Livres (do ingles Free Electron Laser - FEL) e uma fonte para geracao de radiacao eletromagnetica, com caracteristicas de Laser, baseada na interacao de um feixe de eletrons relativistico com um campo magnetico estatico ondulado, proporcionado por um dispositivo de insercao denominado Ondulador. O Ondulador e construido com imas permanentes e atua como amplificador optico e cavidade ressonante. O feixe relativistico, obtido a partir de um acelerador eletrostatico linear, tem sua trajetoria controlada por dispositivos magneticos, Dipolos e Quadrupolos, de modo a injetar os eletrons convenientemente no Ondulador. Este trabalho descreve a funcao destes elementos magneticos (Dipolo, Quadrupolo e Ondulador) em um FEL, bem como, sua modelagem numerica. O Dipolo e o Quadrupolo descritos sao do tipo solenoide. Os dipolos permitem deflexionar, e direcionar, o feixe de eletrons e os Quadrupolos, atuam como lentes convergentes que corrigem a divergencia do feixe. Os modelos n...
2019 4th International Symposium on Instrumentation Systems, Circuits and Transducers (INSCIT)
The v-Angra Experiments intends to develop a detector capable of inferring the dissipated power o... more The v-Angra Experiments intends to develop a detector capable of inferring the dissipated power of nuclear reactors by means of measuring the rate of neutrinos events detected by a system installed at sea level a few tens of meters away from the nuclear core. The TARGET detector is a key component of the v-Angra Experiment and of its trigger system since its signals are sent to the trigger electronics which makes use of them to select events for storage. Alongside, cosmic rays represent its main background noise and, consequently, its characteristics when interacting with the detector should be well known in order to enable the experiment to develop an efficient events-selection algorithm. This work presents a study of the characteristics of cosmic rays events in the TARGET detector in order to acquire valuable information for the development of trigger system.
2018 3rd International Symposium on Instrumentation Systems, Circuits and Transducers (INSCIT), 2018
In this work, a battery of measurements have been carried out with the objective of characterizin... more In this work, a battery of measurements have been carried out with the objective of characterizing the target detector of the Neutrinos Angra Experiment using a cosmic rays based trigger. It is its first assessment after the detector was fully equipped with all the 32 PMTs, as foreseen by the project, and its custom-based readout electronics. The $\nu -$ Angra detector was constructed with the purpose of measuring antineutrinos particles generated in the fission process of the Angra dos Reis Nuclear Reactor. Before transporting it to the nuclear reactor facility, it is important to measure its operational characteristics as a first step of the commissioning stage. The achieved results describing some of the main characteristics of the detector system are presented in this document.
2018 3rd International Symposium on Instrumentation Systems, Circuits and Transducers (INSCIT), 2018
The Neutrinos Angra (ν-Angra) Experiment has the objective of developing a compact surface detect... more The Neutrinos Angra (ν-Angra) Experiment has the objective of developing a compact surface detector capable of monitoring the activity of nuclear reactors. The collaboration ν-Angra makes use of the Geant4 package to simulate the interactions occurring inside the detector. The outcome of this Geant4based software provides time, position and energy of photons that reach the detector sensors; therefore none information about the electrical signal formation is given. In this context, this work proposes a method to simulate the ν-Angra electrical signal coming out from the signal acquisition chain. such chain is composed of a photomultiplier, an amplifier-shaper circuit and an analog-to-digital converter. The characteristics of the proposed method will be described and its performance will be evaluated based on a comparison between its output response and the real signal, experimentally acquired.
When nanocrystalline copper ferrite (average grain size D≈6 nm) is subjected to high-energy-milli... more When nanocrystalline copper ferrite (average grain size D≈6 nm) is subjected to high-energy-milling in air over different periods up to 12 h, we observe both a progressive enhancement of the ferrite's magnetic response and a shifting of its superparamagnetic limit. These are revealed by the shift to higher values of the Mössbauer blocking temperature, the maximum of the zero-field cooled
The magnetic behavior of nanocrystalline copper spinel ferrites CuxFe3-xO4 (0.42&... more The magnetic behavior of nanocrystalline copper spinel ferrites CuxFe3-xO4 (0.42<=x<=1) exhibiting different degrees of crystallinity, have been investigated by means of in-field Mössbauer and dc magnetic measurements. The samples were obtained by a coprecipitation method and were subsequently high-energy ball milled for different times, which induced a progressive improvement of the ferrite crystallinity and cation redistribution. Their magnetism shows some
Laser de Eletrons Livres (do ingles Free Electron Laser - FEL) e uma fonte para geracao de radiac... more Laser de Eletrons Livres (do ingles Free Electron Laser - FEL) e uma fonte para geracao de radiacao eletromagnetica, com caracteristicas de Laser, baseada na interacao de um feixe de eletrons relativistico com um campo magnetico estatico ondulado, proporcionado por um dispositivo de insercao denominado Ondulador. O Ondulador e construido com imas permanentes e atua como amplificador optico e cavidade ressonante. O feixe relativistico, obtido a partir de um acelerador eletrostatico linear, tem sua trajetoria controlada por dispositivos magneticos, Dipolos e Quadrupolos, de modo a injetar os eletrons convenientemente no Ondulador. Este trabalho descreve a funcao destes elementos magneticos (Dipolo, Quadrupolo e Ondulador) em um FEL, bem como, sua modelagem numerica. O Dipolo e o Quadrupolo descritos sao do tipo solenoide. Os dipolos permitem deflexionar, e direcionar, o feixe de eletrons e os Quadrupolos, atuam como lentes convergentes que corrigem a divergencia do feixe. Os modelos n...
2019 4th International Symposium on Instrumentation Systems, Circuits and Transducers (INSCIT)
The v-Angra Experiments intends to develop a detector capable of inferring the dissipated power o... more The v-Angra Experiments intends to develop a detector capable of inferring the dissipated power of nuclear reactors by means of measuring the rate of neutrinos events detected by a system installed at sea level a few tens of meters away from the nuclear core. The TARGET detector is a key component of the v-Angra Experiment and of its trigger system since its signals are sent to the trigger electronics which makes use of them to select events for storage. Alongside, cosmic rays represent its main background noise and, consequently, its characteristics when interacting with the detector should be well known in order to enable the experiment to develop an efficient events-selection algorithm. This work presents a study of the characteristics of cosmic rays events in the TARGET detector in order to acquire valuable information for the development of trigger system.
2018 3rd International Symposium on Instrumentation Systems, Circuits and Transducers (INSCIT), 2018
In this work, a battery of measurements have been carried out with the objective of characterizin... more In this work, a battery of measurements have been carried out with the objective of characterizing the target detector of the Neutrinos Angra Experiment using a cosmic rays based trigger. It is its first assessment after the detector was fully equipped with all the 32 PMTs, as foreseen by the project, and its custom-based readout electronics. The $\nu -$ Angra detector was constructed with the purpose of measuring antineutrinos particles generated in the fission process of the Angra dos Reis Nuclear Reactor. Before transporting it to the nuclear reactor facility, it is important to measure its operational characteristics as a first step of the commissioning stage. The achieved results describing some of the main characteristics of the detector system are presented in this document.
2018 3rd International Symposium on Instrumentation Systems, Circuits and Transducers (INSCIT), 2018
The Neutrinos Angra (ν-Angra) Experiment has the objective of developing a compact surface detect... more The Neutrinos Angra (ν-Angra) Experiment has the objective of developing a compact surface detector capable of monitoring the activity of nuclear reactors. The collaboration ν-Angra makes use of the Geant4 package to simulate the interactions occurring inside the detector. The outcome of this Geant4based software provides time, position and energy of photons that reach the detector sensors; therefore none information about the electrical signal formation is given. In this context, this work proposes a method to simulate the ν-Angra electrical signal coming out from the signal acquisition chain. such chain is composed of a photomultiplier, an amplifier-shaper circuit and an analog-to-digital converter. The characteristics of the proposed method will be described and its performance will be evaluated based on a comparison between its output response and the real signal, experimentally acquired.
When nanocrystalline copper ferrite (average grain size D≈6 nm) is subjected to high-energy-milli... more When nanocrystalline copper ferrite (average grain size D≈6 nm) is subjected to high-energy-milling in air over different periods up to 12 h, we observe both a progressive enhancement of the ferrite's magnetic response and a shifting of its superparamagnetic limit. These are revealed by the shift to higher values of the Mössbauer blocking temperature, the maximum of the zero-field cooled
The magnetic behavior of nanocrystalline copper spinel ferrites CuxFe3-xO4 (0.42&... more The magnetic behavior of nanocrystalline copper spinel ferrites CuxFe3-xO4 (0.42<=x<=1) exhibiting different degrees of crystallinity, have been investigated by means of in-field Mössbauer and dc magnetic measurements. The samples were obtained by a coprecipitation method and were subsequently high-energy ball milled for different times, which induced a progressive improvement of the ferrite crystallinity and cation redistribution. Their magnetism shows some
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Papers by Geraldo Cernicchiaro