Abstract
Computer modeling of a fast electrical discharge in a nitrogen-filled alumina capillary was performed in order to discover discharge system parameters that lead to high radiation intensity in the so-called water window range of wavelengths (2–4 nm). The modeling was performed by means of the two-dimensional RMHD code Z*. The time and spatial distribution of plasma quantities were used for calculating the ion level populations and for estimating the absorption of the 2.88 nm radiation line in the capillary plasma, using the FLYCHK code. Optimum discharge parameters for the capillary discharge water window source are suggested. The heating of the electrodes and the role of capillary channel shielding were analyzed according to the Z* code.
Highlights
Water window radiation sources are interesting for application in the biomedical sciences [1]
We have looked for optimal parameters of the fast capillary discharge radiation source, namely capillary dimensions, electrodes’ shapes and gas filling pressure, in order to achieve maximum radiation power in the water window range of wavelengths
The physical model established in Z* is based on the quasi-neutral multicharged ion plasma magneto-hydrodynamic equations with self-consistent electromagnetic fields and the radiation transport in a 2D axially symmetric geometry
Summary
Water window radiation sources are interesting for application in the biomedical sciences [1]. High absorption of this radiation by proteins, but very little absorption by oxygen, makes imaging of living cells possible. We have looked for optimal parameters of the fast capillary discharge radiation source, namely capillary dimensions, electrodes’ shapes and gas filling pressure, in order to achieve maximum radiation power in the water window range of wavelengths
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