Radiation Anisotropy at the Implosion of Multiwire Arrays

We present the results of studying the dynamics of soft X-ray radiation (SXR) emission in the axial and radial directions in the current implosion of multiwire tungsten arrays with discharge currents of up to 3.5 MA at the Angara-5-1 facility. The size of the region emitting soft X-rays was determined by the measurements of the radiation anisotropy. It was found that the size of the emitting region is ~ 4-5 mm in the SXR range for cylindrical multiwire arrays at peak X-ray power, which corresponds to approximately two to threefold radial compression of the plasma. The time-integrated pinhole camera images show the presence of a significant amount of emitting plasma around the pinch core-trailing mass. We measured the time-integrated radial resolved pinch spectra. It is shown that the presence of trailing mass decreases the spectral power of radiation and changes the characteristics of the spectrum. The size of the emitting region received from the radial resolved spectra is identical to those obtained from the radiation anisotropy and time-integrated pinhole camera images.