摘要
We describe the design and x-ray emission properties(temporal,spatial,and spectral)of Dry Pinch I,a portable X-pinch driver developed at Imperial College London.Dry Pinch I is a direct capacitor discharge device,30033003700 mm3 in size and∼50 kg in mass,that can be used as an external driver for x-ray diagnostics in high-energy-density physics experiments.Among key findings,the device is shown to reliably produce 1.1±0.3 ns long x-ray bursts that couple∼50 mJ of energy into photon energies from 1 to 10 keV.The average shot-to-shot jitter of these bursts is found to be 10±4.6 ns using a combination of x-ray and current diagnostics.The spatial extent of the x-ray hot spot from which the radiation emanates agrees with previously published results for X-pinches-suggesting a spot size of 10±6μm in the soft energy region(1–10 keV)and 190±100μm in the hard energy region(>10 keV).These characteristics mean that Dry Pinch I is ideally suited for use as a probe in experiments driven in the laboratory or at external facilities when more conventional sources of probing radiation are not available.At the same time,this is also the first detailed investigation of an X-pinch operating reliably at current rise rates of less than 1 kA/ns.
基金
Parts of the research detailed were funded by First Light Fusion Ltd.,the U.K.EPSRC
the U.S.Department of Energy under Cooperative Agreement Nos.DE-NA0003764 and DE-SC0018088.
