Development of Luminescent Detectors for Hot Plasmas
Among the main requirements which a broadband radiation detector for high temperature plasmas should possess include: a known or traceable response over as broad a wavelength range as possible; a quick response time; immunity to electromagnetic interference and moreover, in fusion devices the capability to cope neutron producing plasmas; resistance to radiation and operation with a limited access to the machine. Since most of the present designs lack sufficient radiation hardness, research is needed to find a solution. The luminescent properties of phosphor materials are commonly used in radiation detection and measurement. The energy absorbed by the phosphor is partly converted into light whose wavelength range can be tailored by appropriate material and impurity content. Potentially the main advantage for a fusion plasma is that only a thin film of the phosphor plus radiation filters need to be close to the plasma, whereas the most sensitive parts of the system, which receive the luminescent signal via metallic optics and fibres, can be withdrawn to a safer distance. Here we summarise the effort invested over the last years at CIEMAT to develop broadband plasma radiation detectors with spatial, temporal and energy resolution. Particular attention is given to the extrapolation of such detectors to the harsh environment of an ITER-like device.
KeywordsSodium Salicylate Luminescent Material Plasma Radiation High Temperature Plasma Luminescent Detector
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