Experimental investigations of single-layer and nested X-pinches on 1-MA “QiangGuang-1” facility

Summary form only given. The results of an experimental investigation of X-pinch performances on the 1-MA “QiangGuang-1” facility from year 2008-2011 are presented. “QiangGuang-1” is a linear-transformer-driver (LTD)-based water-dielectric lowimpedance transmission line pulsed power machine which provides a peak current of 0.9-1.3 MA and a 10%-90% rise time of 50-60 ns. Single layer and nested X-pinch loads with 2-32 wires of different wire materials (Al, W, and Mo) with wire diameters from 25 to 100 μm have been tested. The number and size of bright spots, the first X-ray burst timing, X-pinch dynamics, and X-ray spectroscopy have been studied using a set of diagnostics with spatial and/or temporal resolution. The optimized X-pinch load on "QiangGuang-1" generator was the 30-wire 25 μm W X-pinch with a crossing angle of 78°, which produced a single X-ray pulse with the FWHM of 2-5 ns and a source of 70 μm. The results were reproduced in different experiment series. The X-ray waveforms from the single-layer high-Z material X-pinches were one-six distinct X-ray bursts, while the nested X-pinches were characterized by two radiation groups composed by multi-bursts each. A same linear trend between the first X-ray burst time and the load linear mass in single-layer and nested X-pinches was observed.