Proton Radiation Belt Anisotropy as Seen by ICARE-NG Head-A

International audienceThe ICARE-NG instrument onboard the Argentinian satellite SAC-D detected much more protons during descending orbits (when latitude decreases) than for ascending orbits (increasing latitudes). In this paper we will investigate on the anisotropy seen by the ICARE-NG Head-A for protons in coincidence mode from Monte-Carlo simulations performed with GEANT4. Our simulations show that the difference in the fluxes observed during ascending and descending orbits comes from the fact that the instrument observed trapped protons or not on each point of the orbits as a result of the instrument and satellite orientations. In addition, we show in this paper that the measurements performed by ICARE-NG can be used in conjunction with our GEANT4 simulations to study the anisotropy of trapped protons, i.e. their distribution relative to their equatorial pitch-angle

Validation of a new 60 MeV proton beam-line for radiation hardness testing

A 60 MeV proton beam-line has been developed in Nice, France, in collaboration with the Centre National d'Etudes Spatiales (CNES). Experimental results are presented here to validate the beam-line for radiation hardness testing.Comment: RADECS conference 202

Recent advances in radiation-hardened fiber-based technologies for space applications

International audience; In this topical review, the recent progress on radiation-hardened fiber-based technologies is detailed, focusing on examples for space applications. In the first part of the review, we introduce the operational principles of the various fiber-based technologies considered for use in radiation environments: passive optical fibers for data links, diagnostics, active optical fibers for amplifiers and laser sources as well as the different classes of point and distributed fiber sensors: gyroscopes, Bragg gratings, Rayleigh, Raman or Brillouin-based distributed sensors. Second, we describe the state of the art regarding our knowledge of radiation effects on the performance of these devices, from the microscopic effects observed in the amorphous silica glass used to design fiber cores and cladding, to the macroscopic response of fiber-based devices and systems. Third, we present the recent advances regarding the hardening (improvement of the radiation tolerance) of these technologies acting on the material, device or system levels. From the review, the potential of fiber-based technologies for operation in radiation environments is demonstrated and the future challenges to be overcome in the coming years are presented

Mechanics of hybrid polymer composites

Aoudi Mekki, Bessière Fabrice, Biagi Solange, Scheid John, Broise Henri, Monteix Nicolas, Rosso Emmanuelle, Ben Abed Aïcha, André Nathalie, Balmelle Catherine, Chbili Jarir, Durost Raphaël, Jaquet-Bessière Catharina, Curie Julien, Petit Christophe. Jebel Oust (Tunisie). In: Mélanges de l'École française de Rome. Antiquité, tome 120, n°1. 2008. Antiquité. pp. 260-270

Characterization and performance optimization of radiation monitoring sensors for high energy physics experiments at the CERN LHC and Super-LHC

In order to study the matter originating from the universe, a new particle accelerator named the Large Hadron Collider (LHC) has been built at CERN. The radiation environment generated by the hadrons collisions in the high energy physics experiments of the LHC will be complex and locally very intense. For monitoring this complex radiation field, dosimeters have been installed in the LHC experiments. In previous study, RadFET dosimeters and PIN diodes have been characterized for their use in the particle accelerator. However, even if the RadFETs sensors have been already extensively characterized, their radiation response can be affected by their package. Depending on the material and the geometry, the package can induce errors in the dose measurement. In this thesis, a complete study has been carried out in order to evaluate its influence. Concerning the PIN diodes, the readout protocol used for the LHC is no longer valuable for the Super-LHC. Therefore, a complete study on their radiation response has been performed up to very high fluences (≈ 6×1015 neq/cm2) in view of their utilization as radiation monitoring sensors for the Super-LHC

Radiation Tolerance of Programmable Voltage Supply and High Galvanic Insulation Readout Electronics Used by CERN's LHC Cryogenics

Two new types of electronic cards have been tested in CERN's CHARM irradiation facility. The cards are a complete redesign of a programmable voltage power supply and a revision of a conditioning card used for resistance temperature sensors. The power supply is adjustable between 0 to 60 Vdc and 0 to 4 A; in the ac mode power is adjusted by using a Pulse Width Modulation technique with 230 Vac and 6 A as maximum ratings. The design is based mostly on Commercial Off The Shelf (COTS) integrated circuits that were individually qualified and selected with a TID withstand level target of 1 kGy(Si). The conditioning card is designed to provide galvanic insulation for the temperature sensors that are referred to the LHC magnets power supplies. These cards are mainly located in low radiation areas where Single Event Effects (SEE) can be problematic, the new design mitigates the SEU susceptibility and is capable of withstanding more than 2.5 kV on individual high voltage tests. The card foresees the use of either commercial or rad-hard voltage regulators in order to increase the TID lifetime

Packaging effects on RadFET sensors for high energy physics experiments

RadFETs in customized chip carrier packages are installed in the LHC Experiments as radiation monitors. The package influence on the dose measurement in the complex LHC radiation environment is evaluated using Geant4 simulations and experimental data

Amyl nitrite inhalation, a "volatile" anemia

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Radiation Response of Forward biased Float Zone and Magnetic Czochralski Silicon Detectors of Different Geometry for 1-MeV Neutron Equivalent Fluence Monitoring

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