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This article describes the properties of the Carbon fibers that were used during the ground calibration of the High Frequency Instrument of the Planck satellite. It focuses on the properties of this new device used as radiation sources, and on the modelling of its thermal behaviour. Experimental data are presented and successfully compared with the proposed theory. Their small time constant, their stability and their emission spectrum pointing in the submm range make these fibers a very usefull tool for characterizing FIR instruments.
We manufactured pulsed illuminators emitting in the far infrared for the Planck-HFI bolometric instrument ground calibrations. Specific measurements have been conducted on these light sources, based on Carbon fibers, to understand and predict their properties. We present a modelisation of the temperature dependence of the thermal conductivity and the calorific capacitance of the fibers. A comparison between simulations and bolometer data is given, that shows the coherence of our model. Their small time constants, their stability and their emission spectrum pointing in the submm range make these illuminators a very usefull tool for calibrating FIR instruments.
We manufactured pulsed illuminators emitting in the far infrared for the Planck-HFI bolometric instrument ground calibrations. Specific measurements have been conducted on these light sources, based on Carbon fibers, to understand and predict their properties. We present a modelisation of the temperature dependence of the thermal conductivity and the calorific capacitance of the fibers. A comparison between simulations and bolometer data is given, that shows the coherence of our model. Their small time constants, their stability and their emission spectrum pointing in the submm range make these illuminators a very usefull tool for calibrating FIR instruments.
As part of the R&D toward the production of high flux of polarised Gamma-rays we have designed and built a non-planar four-mirror optical cavity with a high finesse and operated it at a particle accelerator. We report on the main challenges of such cavity, such as the design of a suitable laser based on fiber technology, the mechanical difficulties of having a high tunability and a high mechanical stability in an accelerator environment and the active stabilization of such cavity by implementing a double feedback loop in a FPGA.
Recently LAL (Laboratoire de l'Accelerateur Lineaire, Orsay France) has launched an R&D program that involves optical Fabry-Perot resonators and high power fibre lasers. This program is part of the global effort aiming at the design of a polarised positron source for the next linear collider (ILC or CLIC). At the same time an important effort is devoted to the possible applications of this technology at lower energy for medical and industrial applications. In this framework a collaboration was started between different French laboratories (RadioThomX project) and industrial partners to study the feasibility of a low energy machine that should provide a high x-ray flux (~ 1012 - 1013 X s-1 at 50 keV in the 10% energy bandwidth). In both the high and the low energy studies the designs are based on the possibility to increase the average ...
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