In the last 11 years the Beam Test Facility (BTF) of the Frascati DAFNE accelerator has gained an... more In the last 11 years the Beam Test Facility (BTF) of the Frascati DAFNE accelerator has gained an important role in the development of particle detectors development. Electron and positron beams can be extracted to a dedicated transfer line, where a target plus a dipole and collimator system can attenuate and momentum-select secondary particles. The BTF can thus provide a wide range of beam parameters: energy (from about 50 to 750/540 MeV for electrons/positrons), charge (up to 1010 particles/bunch) and pulse length (1.5-40 ns), with a maximum repetition rate of 50 Hz. Beam spot and divergence can be adjusted, down to submm and 2 mrad. Photons can be produced on a target, and energy-tagged inside a dipole by Silicon micro-strip detectors. A shielded Tungsten target is used for neutron production: about 8·10-7/primary, 1 MeV neutrons are produced. In addition to these activities, a dedicated particle physics experiment (PADME) has been recently approved for running at the BTF, with a...
The LINAC of the DAΦNE complex is in operation since 1996, both as injector of the e e -factory, ... more The LINAC of the DAΦNE complex is in operation since 1996, both as injector of the e e -factory, and, since 2003, for the extraction of electron beam to the Beam Test Facility. In the last years, many improvements have been developed in different sub-systems of the LINAC, aiming at a wider, tuneable range of beam parameters, in particular the pulse time width and the pulse charge. A long term measurement campaign has been recently started to characterize the LINAC performance after that many sub-systems has been overhauled and improved, starting from RF power (i.e. klystron substitution, modulator renewal, RF driver layout, SLED tuning) as well as the timing system, magnets, cooling, vacuum, control system and energy/position diagnostics. This work reports the latest results on the optimization of the fully consolidated system. LINAC DESCRIPTION The electron-positron LINAC of the DAΦNE collider complex is a ~60 m long, S-band (2856 MHz) linear accelerator, and has been in operation ...
The possibility to drive a SASE X-ray FEL using the 6 GeV electron linac foreseen by the SuperB p... more The possibility to drive a SASE X-ray FEL using the 6 GeV electron linac foreseen by the SuperB project has been recently considered. In this paper a preliminary design study based on FEL scaling laws supported by HOMDYN and GENESIS simulations is presented. The goal of this work is to provide a preliminary design study of the FEL system, based on state of the art normal conducting technology, suitable to conduct a realistic evaluation of the additional costs required to drive an FEL user facility making use of the SuperB linac.
This communication describes a recently developed single-exposure neutron spectrometer, based on ... more This communication describes a recently developed single-exposure neutron spectrometer, based on multiple active thermal neutron detectors located within a moderating sphere, which have been developed jointly by CIEMAT (Spain), INFN (Italy) and Politecnico di Milano (Italy) in the framework of Italian and Spanish collaboration projects. The fabricated prototypes permit to achieve spectrometric resolution with nearly isotropic response for neutron with energies from thermal to 100-200 MeV, thus being able to characterise the complete neutron spectrum in only one exposure by unfolding the measured responses of the detectors. This makes it especially advantageous for characterising neutron fields and workplace monitoring purposes in neutron-producing facilities.
Detection of light dark matter, such as axion-like particles, puts stringent requirements on the ... more Detection of light dark matter, such as axion-like particles, puts stringent requirements on the efficiency and dark-count rates of microwave-photon detectors. The possibility of operating a current-biased Josephson junction as a single-microwave photon-detector was investigated through numerical simulations, and through an initial characterization of two Al junctions fabricated by shadow mask evaporation, done in a dilution refrigerator by measuring escape currents at different temperatures, from 40 mK up to the Al transition temperature. The escape dynamics of the junctions were reproduced in the simulation, including the dissipative effects. Inhibition of thermal activation was observed, leaving the macroscopic quantum tunneling as the dominant effect well beyond the crossover temperature.
Macroscopic Quantum Coherence and Quantum Computing, 2001
ABSTRACT A superconducting single electron transistor, based on aluminum electrodes, was fabricat... more ABSTRACT A superconducting single electron transistor, based on aluminum electrodes, was fabricated and studied. The characterization was made by measuring both the transport properties as a function of temperature and the noise performance. As a result, we observed modulation of the transfer characteristics up to 1.4K and we measured a charge sensitivity of 3.8 10-4 e/√Hz at 10 Hz and 0.3 K.
Page 1. Bruno Buonomo: REALIZZAZIONE E CARATTERIZZAZIONE DI TRANSISTOR A SINGOLO ELETTRONE Tesi d... more Page 1. Bruno Buonomo: REALIZZAZIONE E CARATTERIZZAZIONE DI TRANSISTOR A SINGOLO ELETTRONE Tesi di Laurea in Fisica -2001 Riassunto In questo lavoro di tesi si sono la progettati, realizzati e caratterizzati diversi campioni di ...
A new thermal neutron irradiation facility based on an (241)Am-Be source embedded in a polyethyle... more A new thermal neutron irradiation facility based on an (241)Am-Be source embedded in a polyethylene moderator has been designed, and is called ETHERNES (Extended THERmal NEutron Source). The facility shows a large irradiation cavity (45cm×45cm square section, 63cm in height), which is separated from the source by means of a polyethylene sphere acting as shadowing object. Taking advantage of multiple scattering of neutrons with the walls of this cavity, the moderation process is especially effective and allows obtaining useful thermal fluence rates from 550 to 800cm(-2)s(-1) with a source having nominal emission rate 5.7×10(6)s(-1). Irradiation planes parallel to the cavity bottom have been identified. The fluence rate across a given plane is as uniform as 3% (or better) in a disk with 30cm (or higher) diameter. In practice, the value of thermal fluence rate simply depends on the height from the cavity bottom. The thermal neutron spectral fraction ranges from 77% up to 89%, depending on the irradiation plane. The angular distribution of thermal neutrons is roughly isotropic, with a slight prevalence of directions from bottom to top of the cavity. The mentioned characteristics are expected to be attractive for the scientific community involved in neutron metrology, neutron dosimetry and neutron detector testing.
In the last 11 years the Beam Test Facility (BTF) of the Frascati DAFNE accelerator has gained an... more In the last 11 years the Beam Test Facility (BTF) of the Frascati DAFNE accelerator has gained an important role in the development of particle detectors development. Electron and positron beams can be extracted to a dedicated transfer line, where a target plus a dipole and collimator system can attenuate and momentum-select secondary particles. The BTF can thus provide a wide range of beam parameters: energy (from about 50 to 750/540 MeV for electrons/positrons), charge (up to 1010 particles/bunch) and pulse length (1.5-40 ns), with a maximum repetition rate of 50 Hz. Beam spot and divergence can be adjusted, down to submm and 2 mrad. Photons can be produced on a target, and energy-tagged inside a dipole by Silicon micro-strip detectors. A shielded Tungsten target is used for neutron production: about 8·10-7/primary, 1 MeV neutrons are produced. In addition to these activities, a dedicated particle physics experiment (PADME) has been recently approved for running at the BTF, with a...
The LINAC of the DAΦNE complex is in operation since 1996, both as injector of the e e -factory, ... more The LINAC of the DAΦNE complex is in operation since 1996, both as injector of the e e -factory, and, since 2003, for the extraction of electron beam to the Beam Test Facility. In the last years, many improvements have been developed in different sub-systems of the LINAC, aiming at a wider, tuneable range of beam parameters, in particular the pulse time width and the pulse charge. A long term measurement campaign has been recently started to characterize the LINAC performance after that many sub-systems has been overhauled and improved, starting from RF power (i.e. klystron substitution, modulator renewal, RF driver layout, SLED tuning) as well as the timing system, magnets, cooling, vacuum, control system and energy/position diagnostics. This work reports the latest results on the optimization of the fully consolidated system. LINAC DESCRIPTION The electron-positron LINAC of the DAΦNE collider complex is a ~60 m long, S-band (2856 MHz) linear accelerator, and has been in operation ...
The possibility to drive a SASE X-ray FEL using the 6 GeV electron linac foreseen by the SuperB p... more The possibility to drive a SASE X-ray FEL using the 6 GeV electron linac foreseen by the SuperB project has been recently considered. In this paper a preliminary design study based on FEL scaling laws supported by HOMDYN and GENESIS simulations is presented. The goal of this work is to provide a preliminary design study of the FEL system, based on state of the art normal conducting technology, suitable to conduct a realistic evaluation of the additional costs required to drive an FEL user facility making use of the SuperB linac.
This communication describes a recently developed single-exposure neutron spectrometer, based on ... more This communication describes a recently developed single-exposure neutron spectrometer, based on multiple active thermal neutron detectors located within a moderating sphere, which have been developed jointly by CIEMAT (Spain), INFN (Italy) and Politecnico di Milano (Italy) in the framework of Italian and Spanish collaboration projects. The fabricated prototypes permit to achieve spectrometric resolution with nearly isotropic response for neutron with energies from thermal to 100-200 MeV, thus being able to characterise the complete neutron spectrum in only one exposure by unfolding the measured responses of the detectors. This makes it especially advantageous for characterising neutron fields and workplace monitoring purposes in neutron-producing facilities.
Detection of light dark matter, such as axion-like particles, puts stringent requirements on the ... more Detection of light dark matter, such as axion-like particles, puts stringent requirements on the efficiency and dark-count rates of microwave-photon detectors. The possibility of operating a current-biased Josephson junction as a single-microwave photon-detector was investigated through numerical simulations, and through an initial characterization of two Al junctions fabricated by shadow mask evaporation, done in a dilution refrigerator by measuring escape currents at different temperatures, from 40 mK up to the Al transition temperature. The escape dynamics of the junctions were reproduced in the simulation, including the dissipative effects. Inhibition of thermal activation was observed, leaving the macroscopic quantum tunneling as the dominant effect well beyond the crossover temperature.
Macroscopic Quantum Coherence and Quantum Computing, 2001
ABSTRACT A superconducting single electron transistor, based on aluminum electrodes, was fabricat... more ABSTRACT A superconducting single electron transistor, based on aluminum electrodes, was fabricated and studied. The characterization was made by measuring both the transport properties as a function of temperature and the noise performance. As a result, we observed modulation of the transfer characteristics up to 1.4K and we measured a charge sensitivity of 3.8 10-4 e/√Hz at 10 Hz and 0.3 K.
Page 1. Bruno Buonomo: REALIZZAZIONE E CARATTERIZZAZIONE DI TRANSISTOR A SINGOLO ELETTRONE Tesi d... more Page 1. Bruno Buonomo: REALIZZAZIONE E CARATTERIZZAZIONE DI TRANSISTOR A SINGOLO ELETTRONE Tesi di Laurea in Fisica -2001 Riassunto In questo lavoro di tesi si sono la progettati, realizzati e caratterizzati diversi campioni di ...
A new thermal neutron irradiation facility based on an (241)Am-Be source embedded in a polyethyle... more A new thermal neutron irradiation facility based on an (241)Am-Be source embedded in a polyethylene moderator has been designed, and is called ETHERNES (Extended THERmal NEutron Source). The facility shows a large irradiation cavity (45cm×45cm square section, 63cm in height), which is separated from the source by means of a polyethylene sphere acting as shadowing object. Taking advantage of multiple scattering of neutrons with the walls of this cavity, the moderation process is especially effective and allows obtaining useful thermal fluence rates from 550 to 800cm(-2)s(-1) with a source having nominal emission rate 5.7×10(6)s(-1). Irradiation planes parallel to the cavity bottom have been identified. The fluence rate across a given plane is as uniform as 3% (or better) in a disk with 30cm (or higher) diameter. In practice, the value of thermal fluence rate simply depends on the height from the cavity bottom. The thermal neutron spectral fraction ranges from 77% up to 89%, depending on the irradiation plane. The angular distribution of thermal neutrons is roughly isotropic, with a slight prevalence of directions from bottom to top of the cavity. The mentioned characteristics are expected to be attractive for the scientific community involved in neutron metrology, neutron dosimetry and neutron detector testing.
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