Abstract
Progress in the magnetic fusion programs has driven and been driven by the development of sophisticated diagnostic systems. The application of state of the art technologies has resulted in major strides in detailed measurements of plasma characteristics. We present the details of design studies carried out to develop specialized instrumentation. For application to optical spectroscopy, a compact multichannel spectroscopic monitor is described. This instrument is designed for simultaneous observation of plasma emissions from a variety of spatial locations. The heart of the system is an optical filter mosaic and MCP/CCD array. Applications include impurity emission monitoring, particle inventory, and working gas fraction measurements in minority heating experiments. The second instrument includes a detector design for application to high time resolution measurements of electron cyclotron emissions. The system is based on arrays of slot-antennae/detectors manufactured on single semiconductor wafers. This millimeter-wave monolithic integrated circuit (MMIC) device can be tailored to detect radiation in the 50–300 GHz range typical of tokamak plasmas. Advantages include uniformity of detector response, spectral resolution without gratings, and high spatial resolution. Details of both designs will be discussed with emphasis on ranges of application in present and next generation machines.
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