Bruno Spataro

Monochromatic and polarized tagged ladon gamma ray beams

Abstract We discuss the production of monochromatic and polarized gamma ray beams by backward Compton scattering of laser light against the high energy electrons circulating in a storage ring. The gamma ray energy resolution obtainable by photon collimation is compared to that obtainable by tagging the scattered electrons. A complete model of the tagged electron technique is developed in the linear theory of electron optics. The formulas are applied to the proposed 5 GeV European synchrotron radiation facility (ESRP 27/3). The results appear very promising, indicating an energy resolution better than 4 MeV at 780 MeV.

Advanced design of a low energy electron source

A multiphysics-based modeling design of a low energy electron source using a thermionic cathode is described in this paper. The proposed device produces a narrow beam employable in delicate applications where dimensions are critical. The effects of multiple physics influencing factors due to the cathode heating over the beam dynamics have been predicted through a multiphysics design approach. This paper would provide the needed knowledge for virtual prototyping of such devices. For this aim, several strategies have been adopted to obtain a simple model, which shows clearly the investigated mechanisms. According to this study, the appropriate materials and shapes can be chosen.

The HEPD apparatus for the CSES mission

The CSES (China Seismo-Electromagnetic Satellite) mission will investigate the structure and the dynamic of the topside ionosphere, will monitor electric and magnetic field and high energy particle fluctuations, searching for their correlations with the geophysical activity, in order to contribute to the monitoring of earthquakes from space. The High-Energy Particle Detector (HEPD) is one of the payloads of the CSES space mission, built by the Italian “Limadou” collaboration. Results of the test beams held at the Beam Test Facility of the INFN National Laboratory of Frascati, for electrons, and at the Proton Cyclotron of Trento, for protons, will be presented.

Study on the High Energy Particle Detector calorimeter

The High-Energy Particle Detector (HEPD) is one of the payloads of the CSES space mission, built by the Italian “Limadou” collaboration. It will study the temporal stability of the inner Van Allen radiation belts, the precipitation of trapped particles in the atmosphere and the low energy component of the cosmic rays (5 - 100 MeV for electrons and 15 - 300 MeV for protons). Results of the test beams held at the Beam Test Facility of the INFN National Laboratory of Frascati, for electrons, and at the Proton Cyclotron of Trento, for protons, will be presented. The performance of the apparatus both on the energy reconstruction and in the lepton/hadron separation will be shown.