Validation of MHD Code FLUX-rz Using Scintillation Measurements of Thermal Radiation in Nested Wire Array $Z$ -Pinch

This paper demonstrates the improved simulation of a Z-pinch experiment with 2-D magnetohydrodynamic code FLUX-rz developed in RFNC-VNIIEF. A Z-pinch load was nested wire array powered by a helical magnetocumulative generator with the current pulse $I_{\max } \approx 4.2$ MA and effective rise time $\tau \approx 400$ ns. Validation of X-ray spectral measurements carried out with scintillation detector filters pointed out a necessity to take into consideration both the scintillator “dead” layer and oxide films on the aluminum filter surface.

I. Introduction

The investigation of intense fluxes of the soft X-ray radiation (SXR) generating as a result of the implosion of cylindrical multiwire arrays has been carrying out in RFNC-VNIIEF for several years. Numerical magnetohydrodynamic (MHD) code FLUX-rz is used to predict and interpret the experimental results. The calculation physical model includes radiation transfer in a multigroup diffusion approximation [1]. The process of a substance ablation from the multiwire array under the influence of the flowing current is described phenomenologically in the regime of prolonged plasma formation [2].