SPECTRAL SELECTIVE PLASMA IMAGING IN THE WAVELENGTH RANGE 2.4-4.5 NM IN SPEED-2 DEVICE

X-ray images of the compression phase of a deuterium-embedded argon pi nch plasma generated with the SPEED 2 driver in a plasma focus configu ration were obtained. To record spectral selective images, an x-ray mi croscope based on cylindrically bent multilayer mirrors (MLMs) mounted in a parallel configuration was developed, The plasma images were tak en at different wavelengths in the interval from 2.4 to 4.5 nm with a spectral resolution of lambda/Delta lambda similar or equal to 100 and a spatial resolution of approximately 80 mu m within a 30 mm diameter field of view. A strong wavelength dependence of the shape and the si ze of the emitting regions of the plasma was found. images of bright s pots with a size of about 0.5 mm identified as being early stages of m icropinches were obtained.