The performance of a grazing incidence (85 degrees ) VUV duochromator using two proximity focused metallic multi-anode microchannel plate detectors is described. The system, using standard photon counting techniques directly on an array of ten straight anodes, has a total coverage of 5-230 nm, with a 0.13 nm (one anode) spectral resolution; each detector (centred on the Rowland circle and mounted perpendicularly to the diffracted ray) covers a 1.33 nm region (the spectral range being independent of the central wavelength value). A maximum permissible counting rate of 2*106 Hz has been obtained, thus allowing sub-millisecond time resolution. Examples of the operation of this system on the Tore Supra tokamak are described.
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Michelis et al. (1993) studied this question.
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