科研之友
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摘要
In order to measure in a nuclear fusion experiment the absolute radiated plasma power - a part of the overall energy balance - metal foil resistive bolometers have been state of the art for a long time. They measure the emitted radiation broadband alongmany lines of sight (LOS); typically several of them are integrated in one camera. Using tomographic reconstruction methods allows reconstructing the spatial profile of the plasma radiation. For the international fusion experiment ITER, which is currently being constructed, very stringent requirements are placed on the bolometer cameras, particularly with regard to the narrow LOS characteristics and their precise alignment in the plasma vessel. As part of the development of the new bolometer system, a fully automated test facility has been developed [1]. It is based on a KUKA robot and allows the measurement of the two-dimensional characteristic of a LOS. In this paper, the theoretical background of the LOS in a fusion experiment, the principal measurement method of the test facility and its achievable measurement accuracy are presented. Additionally, the measurement reproducibility is assessed, particularly with regard to the influence of the calibration light source and its positioning accuracy. Finally, some selected LOS measurement results are discussed. In addition, the method for the geometric calibration of all involved components of the measuring system in a global coordinate system, such as in the fusion experiment ASDEX (axisymmetric divertor experiment) Upgrade, is presented.
- 出版日期2015-10
