Fast charged-coupled device spectrometry using zoom-wavelength optics

Fast charged-coupled device spectrometry using zoom-wavelength optics

Fast charged-coupled device spectrometry using zoom-wavelength optics 150 150 Mathew

Fast charged-coupled device spectrometry using zoom-wavelength optics

Fast charge-coupled device (CCD) detector arrays placed at the output of visible spectrometers are used for multichord Doppler shift analyses on the COMPASS-D and START tokamaks. Unequal magnification in the horizontal and vertical axes allows for optimal matching of throughput and spectral resolution at the CCD detector. This involves cylindrical lenses in an anamorphic mounting. Optical acuity is preserved over a very wide range of wavelengths (220 nm to 700 nm) by separate repositioning of all the optical elements which is accomplished by the use of zoom mechanisms. This facilitates rapid changes of wavelength allowing edge and core observations depending on the location of the emitting impurity ions.

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16/05/1996