The source of X-rays and high-charged ions based on moderate power vacuum discharge with laser triggering

Abstract

Abstract. The source of X-ray radiation with the energy of quanta that may vary in the range h = 1÷12 keV was developed for studies in X-ray interaction with matter and modifi cation of solid surfaces. It was based on a vacuum spark discharge with the laser triggering. It was shown in our experiments that there is a possibility to adjust X-ray radiation spectrum by changing the confi guration of the electrode system when the energy stored in the capacitor is varied within the range of 1÷17 J. A comprehensive study of X-ray imaging and quanta energy was carried out. These experiments were carried out for the case of both direct and reverse polarity of the voltage on the electrodes. Additionally, ion composition of plasma created in a laser-triggered vacuum discharge was analyzed. Highly charged ions Zn (+21) , Cu (+20) and Fe (+18) were observed.

Micro-pinch formation and extreme ultraviolet emission of laser-induced discharge plasma*

“…[33] It is found that both Z-pinch and micro-pinch require not only high current peak but also high current rising rate, otherwise the long time expansion of plasma makes it hard to compress the plasma. [34] Although the Z-pinch plasma can reach a higher temperature, which is beneficial to the EUV production, micro-pinch plasma has its advantages, i.e., a relatively low energy injection and a more concentrated emission zone. [35] The small plasma size can reduce the optical depth and selfabsorption, so it is easier for EUV collection.…”

The influence of the conditions of laser initiation on soft X-rays emission of vacuum spark

“…The scheme of the experimental setup is shown in figure 1 [6]. The experimental setup consists of a vacuum interaction chamber (pressure P ≈ 10 -5 Torr), a high-voltage discharge system, initiating Nd: YAG laser (λ=1,06 µm, the pulse energy E laser =30÷60 mJ and pulse durationτ≈15 ns) and the diagnostic system.…”

Emission Of Multipulcharged Ions From Laser-Triggering Vacuum Discharge

“…In order to investigate the component and charge composition of the laser-induced discharge plasma we used the combination of time-of-flight mass analyzer (TOF) with magnetic-sector instruments [4]. Ions emitted from the discharge plasma at a small angle to its axis (α ≈ 21 0 ) were detected by the vacuum electron multiplier of the TOF mass analyzer (Fig.1).…”