Soil moisture retrieval using an airborne L-Band Radiometer

This work project will be divided in 5 chapters. Firstly, chapter two reviews the basics of radiometry, emission theory and types of radiometer. Chapter three covers the avionic system in place aboard the platform, describing the set of sensors aboard. Chapter four describes the main functions and algorithms implemented in the ARIEL Processor - Soil Moisture Retrieval (AP-SMR). The main steps of data processing will be explained: synchronisation, calibration and soil moisture retrieval. Chapter five describes the graphical interface of AP-SMR, how to use it, and how to get the geo-referenced images over Google Earth. Chapter six presents the soil moisture estimations obtained and comments the radiometric data from two different flights. Finally chapter seven presents some conclusions and future research lines

Space Charge Neutralization and its Dynamic Effects

Electronic Conference Proceedings (eConf) - Proceedings sur le site http://hb2006.kek.jp/International audienceHigh-power accelerators are being studied for several projects including accelerator driven neutron or neutrino sources. The low energy part of these facilities has to be carefully optimized to match the beam requirements of the higher energy parts. In this low energy part, the space charge self force, induced by a high intensity beam, has to be carefully controlled. This nonlinear force can generate a large and irreversible emittance growth of the beam. To reduce the space charge (SC), neutralization of the beam charge can be done by capturing some particles of the ionised residual gas in the vacuum chamber. This space charge compensation (SCC) regime complicates the beam dynamics study. This contribution aims to modelize the beam behavior in such a regime and to give order of magnitude to the linac designer for the neutralization rise time and the induced emittance growth