A COMPACT EXTREME ULTRAVIOLET SPECTROMETER WITH SPATIAL RESOLUTION

THE GOAL OF THIS PROJECT IS TO DEVELOP A PROTOTYPE OF A HIGH RESOLUTION, HIGH THROUGHPUT, NEAR-NORMAL INCIDENCE, COMPACT SPECTROMETER FOR DIAGNOSTICS WITH SPATIAL RESOLUTION OF FUSION PLASMAS. IT IS PLANNED TO USE HIGHLY DISPERSIVE NEW MINIATURE OPTICAL ELEMENTS-SLICED MULTILAYERS-IN REFLECTION AND TRANSMISSION MODES INSTEAD OF CONVENTIONAL GRATINGS. BECAUSE OF THE EXTREMELY LARGE ANGULAR DISPERSION OF THESE COMPONENTS, THE DIMENSIONS OF THE SPECTROMETER WILL BE DRAMATICALLY DECREASED. A SINGLE-CHANNEL INSTRUMENT WILL HAVE A SIZE OF ABOUT FIVE CM. MANY OF THESE MINIATURE SPECTROMETERS CAN BE ASSEMBLED INTO A COMPACT MULTICHANNEL INSTRUMENT PROVIDING SPATIAL RESOLUTION OF SPECTROSCOPIC MEASUREMENTS. IN PHASE I, A FEASIBILITY EXPERIMENT WILL BE PERFORMED TO DEMONSTRATE AN EXPECTED INTENSE FIRST DIFFRACTION ORDER FOR RADIATION IN THE RANGE OF 13 TO 17 NM OF THE NEW DISPERSIVE ELEMENT (SLICED MULTILAYER). THE EXPERIMENTAL DATA WILL ALLOW COMPARISON OF THE OPERATIONAL PARAMETERS OF THE SPECTROMETER WITH PRESENT GRAZING INCIDENCE SPECTROMETERS.