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 Method for In-Situ, Total Ionising Dose Measurement of Temperature Coefficients of Semiconductor Device Parameters
This work presents and discusses a test method developed to allow the measurement of total ionising dose induced changes in temperature effects on electronic devices for space and nuclear applications. Two demonstration experiments testing commercial PMOS transistors were performed, using different methods of I-V curve measurement. The temperature of the devices during irradiation was controlled precisely using a commercial thermoelectric cooler. A programmable temperature controller combining digital and analogue control techniques was developed for this project. The experimental results allow better insight into the field of temperature sensitivity of PMOS devices.
Optical fibers for plasma diagnostics under gamma-ray and UV irradiation
The remote diagnostics of plasmas in fusion installations requires adequate connection links to transfer the measured signals in media subjected to high-electromagnetic disturbances, high-temperature and ionizing radiation conditions. We evaluated the gamma-ray and UV radiation induced optical absorption in several commercially available optical fibers, as they were assessed for their possible use in fusion installations. Optical fibers with an enhanced UV transmission were investigated, having a core diameter of 400 μm. We studied the recovery effects present after heating the optical fiber samples for both gamma-ray irradiation and UV radiation exposure.