In-situ, low dose rate, total ionising dose test of the cooling performance of a thermoelectric module
This work presents and discusses the design and fully automated total ionising dose test of a thermoelectric cooling module. The goal was to develop a reliable test method which can be used to measure potential total ionising dose induced degradation of the cooling performance and demonstrate this method in a long term, low dose rate experiment. Details of the tested hardware and fully automated test system are published in this work, including preliminary test results and lessons learned.
A total ionising dose, in-situ test campaign of DS18B20 temperature sensors
Comprehensive tests are being performed to identify if the Dallas DS18B20 smart digital temperature sensor is i) a potential solution for temperature monitoring during in-situ gamma irradiation tests and ii) a suitable candidate for commercial low cost space applications. This work presents and discusses an applied test methodology for total ionising dose (TID) irradiation using a cobalt-60 gamma source. Preliminary test results are also published in this paper.
Dynamics of the radiation-induced color centers in optical fibers for plasma diagnostics
Abstract In the past 2 years, we investigated up to 10 different types of silica optical fibers (optical fibers with an enhanced UV response, solarization resistant optical fibers, H2 loaded optical fibers), with a large core diameter (in this case 400 μm), and having various cladding materials. The research was carried out under gamma-ray, neutron and proton irradiation, both off-line and on-line. For the off-line measurements optical fibers were subjected to temperature stress between the irradiation steps (up to 250 °C, according to their cladding material). Depending on the optical fiber type, the manufacturing technology or the cladding material we noticed different aspects of the irradiation-induced optical attenuation, as different color centers are generated. Some of these color centers are partially reverted under high temperature exposure. For a better understanding of the irradiation-induced phenomena we decomposed the automatically acquired optical transmission spectra using a Gaussian deconvolution, for the color centers reported in the literature in the UV spectral range. The paper is a comparative study of these color centers dynamics in various optical fibers, for different irradiation conditions and, in same cases, under temperature stress.