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In order to study the behavior of dielectric materials under an electronic bombardment, a new irradiation chamber has been designed and lately constructed in the laboratory. In a near future, this chamber will be equipped with various experimental set-up allowing measurements in-situ. The aim is to combine complementary information to get a better knowledge on charge transport, storage and release in insulating materials in relation to the electron beam energy and flux. In this paper, we briefly describe the irradiation chamber, and we present our first results obtained by Pulse Electro-Acoustic (PEA) method and by Focussed Laser Intensity Modulated Method (FLIMM) on Polytetrafluoroethylene (PTFE) films after irradiation under a low energetic electron beam.

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Dielectric materials are used as thermal regulator on satellites, as they offer for the embarked electronic devices the required protection. Their behavior in space environment must be studied in order to prevent electrostatic discharges that can be harmful for satellites. An irradiation chamber called MATSPACE has been built to study these materials. It is equipped with various material characterization devices. We will focus this paper on the Laser Intensity Modulation Method (LIMM) and the Split Faraday Cup (SFC) arrangement in the chamber. In a first approach it was necessary to reconsider the thermal aspect of the LIMM data treatment as it was now used under vacuum. In a second step, a new deconvolution treatment has been developed in order to recover the charge profile near the surface and further in the bulk. The influence of frequency range in which the signal is recorded will be also presented.

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