Abstract
X-ray spectral characteristics of a vacuum discharge plasma with the storage energy lower than 30 J initiated on an Al or a Fe cathode by a 1012 W/cm2 neodymium laser were studied in the 30 – 300 Å wavelength range. It is shown that both the spectral composition and intensity of radiation of a micropinch plasma produced in the cathode jet of the discharge are determined by parameters of the discharge and laser pulse. These parameters were optimized to achieve a regime in which a considerable part of radiation energy was concentrated in the long-wavelength band of the quasi-continuum (230 - 270 Å and 160 - 200 Å for Al and Fe, respectively), which makes this discharge a source of narrowband X-ray radiation.
Highlights
The use of such a discharge as a Soft X-ray (SXR) source requires the knowledge of the spectral composition of the radiation depending on the parameters of the discharge, laser pulse and cathode material
The maximum temperature of the micropinch plasma can be determined from shape of the emission spectrum of a metal plasma of some elements, which is important both for understanding the physics of processes involved and for improving parameters of the SXR source based on this discharge
We present the measurements of the emission spectrum of a micropinch plasma produced in the cathode jet of a low-power discharge in a broad spectral range from 30 to 300 Å for different laser pulse energies, different discharge voltages, and different cathode materials
Summary
The use of such a discharge as a SXR source requires the knowledge of the spectral composition of the radiation depending on the parameters of the discharge, laser pulse and cathode material. We present the measurements of the emission spectrum of a micropinch plasma produced in the cathode jet of a low-power discharge in a broad spectral range from 30 to 300 Å for different laser pulse energies, different discharge voltages (currents), and different cathode materials.
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