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Windowless positionhyphen;sensitive xhyphen;ray detector for a Rowland circle crystal spectrometer

机译:Windowless positionhyphen;sensitive xhyphen;ray detector for a Rowland circle crystal spectrometer

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The output from an xhyphen;ray detector using a Chevron pair of microchannel plates has been linearly encoded using an artificial delay line technique. The detector, operating in the wavelength region 12ndash;30 Aring;, has been mounted on the focusing plane of a Johann crystal spectrometer, radius 25 cm, and used to survey the spectrum from the Divertor Injection Tokamak Experiment (DITE) tokamak. The 20times;20 mm2detector is encoded by a remote, CAMAC based, computer acquisition system which at an electronic count rate of 1times;105Hz shows negligible degradation of the spectral profiles. Events encoded along the 20hyphen;mm dimension are directly histogrammed into a CAMAC memory which is capable of recording 128 time frames each with 256 spectral bins with 12 bits/bin. In nonoptimized tests, a FWHM of 60 mgr;m is observed, and a count rate up to 2times;104Hz/mm has been achieved. The highhyphen;resolution capability and the shallow detection depth of the microchannel plate both complement the lowfnumber of the spectrometer. Results are reported for the DITE tokamak.

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