Potential of Kα radiation by energetic ionic particles for high energy density plasma diagnostics

Abstract

In this paper, potential of diagnostics with the use of Ka radiation for an energy deposition process from an intense ion-beam to background plasma is considered quantitatively. Ka radiation is a good candidate for the purpose. The wavelength of Ka radiation is varied according to the charge state of an emitter atom, and the diagnostics spatially resolved with radiations from various kinds of charge states can give us a profile of plasma temperature in a target material. For the calculation of Ka yield, an atomic population kinetics code is developed, and the result shows that Ka radiation has potential to get information of a plasma profile heated by an intense ion-beam.

Numerical simulations of the projectile ion charge difference in solid and gaseous stopping matter

“…The interaction of fast heavy ions with matter is a unique method to investigate processes in complex atomic systems, which play a very important role in modern atomic physics (Kawamura et al, 2006;Nardi et al, 2006). The current research in this field of science is motivated by the application of ion beams for well-tailored energy deposition in matter: inertial fusion, matter heating and tumor therapy (Labaune et al, 2000;Hoffmann et al, 2002Hoffmann et al, , 2005Deutsch & Popoff, 2006;Kraft, 2000).…”

Kα radiation from low charge chlorine heated by an ion beam for cold dense plasma diagnostics

“…They observed small spectral shift of Cl-Kα radiation. Kα radiation with a lower charge state also gives low emission density, which is the same as that with a higher charge state (Kawamura et al, 2006). However, in the study, a resultant volume of plasma creation with an ion-beam-produced-plasma (IPP) scheme is much greater than that by an LPP-scheme, and the above problem may be solved.…”

“…Since the population of 1s-vacant ions is very small, the average charge state of total Cl-ions Z total ≈ Z bulk ≈ Z 1s−vacant − 1, where Z bulk and Z 1s−vacant stand for the average charge state of bulk-ions and 1s-vacant ions, respectively (Kawamura et al, 2002). According to Figure 6 given in Kawamura et al (2006), an intensity ratio between cold-Kα radiation and high charge one is an effective index to deduce an electron temperature T e in the range of 50 eV ≤ T e ≤ 100 eV, in which the ratios give almost 0.1-10. For T e ≤ 50 eV, it is suggested that only Kα lines with M-shell electrons can be applicable.…”

“…In our previous study (Kawamura et al, 2006), Cl-Kα spectra from polyvinyl-chloride (C 2 H 3 Cl), which is often used in laser-produced-plasma (LPP) experiments and chlorine is doped as a tracer, heated by a He 2+ beam were examined for dense plasma diagnostic, and a threshold temperature (∼85 eV) is found to trace energy deposition by an incident ion beam traveling in a target. In the Kα diagnostics with plasma creation by an ion beam, K-shell ionization and dielectronic capture are competed due to a small density of an ion beam, and the K-shell ionization process governs the kinetics of the Kα emission below the threshold.…”

Space-time characterization of laser plasma interactions in the warm dense matter regime

“…The elaboration of plasma dynamics will be the focus of future plasma experiments at FLASH and elsewhere (Höll, 2006;Höll et al, 2004). Alternative methods to diagnose WDM with ion beams are suggested (e.g., Kawamura et al, 2006).…”